This information is provided free of charge by the Department of Industrial Relations from its web site at www.dir.ca.gov. These regulations are for the convenience of the user and no representation or warranty is made that the information is current or accurate. See full disclaimer at https://www.dir.ca.gov/od_pub/disclaimer.html.

Subchapter 7. General Industry Safety Orders
Group 16. Control of Hazardous Substances
Article 107. Dusts, Fumes, Mists, Vapors and Gases

§5155. Airborne Contaminants.

(a) Scope and Application.

(1) This section establishes requirements for controlling employee exposure to airborne contaminants and skin contact with those substances which are readily absorbed through the skin and are designated by the “S” notation in Table AC-1 at all places of employment in the state.

(2) When this section references another section for controlling employee exposures to a particular airborne contaminant, the provisions of this section for such substance shall apply only to those places of employment which are exempt from the other standard.

Exception: The provisions for strontium chromate contained in this section shall continue to apply in all workplaces and shall be in addition to the requirements stated in Sections 1532.2, 5206, and 8359.

Note: Table AC-1 of this section presents concentration limits for airborne contaminants to which nearly all workers may be exposed daily during a 40-hour workweek for a working lifetime without adverse effect. Because of some variation in individual susceptibility, an occasional worker may suffer discomfort, aggravation of a pre-existing condition, or occupational disease upon exposure to concentrations even below the values specified in these tables. The exposure limits established by this section reflect current medical opinion and industrial hygiene practice, doubts being resolved on the side of safety, and are intended to be used in accordance with good industrial hygiene practice by qualified persons. The division recognizes the need for almost continuous review of these concentration limits and also anticipates the need for including new or additional substances. Harmful exposure to any substances not listed in this section shall be controlled in accordance with section 5141.

(b) Definitions.

Ceiling Limit. The maximum concentration of an airborne contaminant to which an employee may be exposed at any time.

Eight-Hour Time-Weighted Average Concentration (TWA). An employee's exposure, as measured or calculated by the formula in Appendix A, to an airborne contaminant during a workday.

Permissible Exposure Limit (PEL). The maximum permitted 8-hour time-weighted average concentration of an airborne contaminant.

Short Term Exposure Limit (STEL). A 15-minute time-weighted average exposure which is not to be exceeded at any time during a workday even if the 8-hour time-weighted average is below the PEL. An averaging period other than 15 minutes may be specified in the footnotes at the end of Table AC-1.

(1) Permissible Exposure Limits (PELs).

(A) An employee exposure to an airborne contaminant in a workday, expressed as an 8-hour TWA concentration, shall not exceed the PEL specified for the substance in Table AC-1.

(B) When substances have additive health effects as described in section (B) of the Appendix to section 5155, the value of D shall not exceed unity.

(2) Short Term Limits.

(A) Short Term Exposure Limit. An employee exposure to an airborne contaminant, expressed as a 15-minute time-weighted average concentration, shall not exceed the STEL specified for the substance in Table AC-1 at any time during the workday. If another averaging period is indicated in the footnotes to Table AC-1, the time-weighted average exposure over that time period shall not exceed the specified STEL at any time during the workday.

(B) All Other Substances Without a Ceiling Limit. Employee exposure to concentrations above the PEL shall be controlled so as to prevent harmful effects such as narcosis, significant irritation of the eyes, skin or respiratory tract, or chronic or irreversible tissue change.

Note: Such substances are not known to cause adverse effects if the maximum concentration of exposure is limited in accordance with the following guidelines.

PEL Value*	Multiplication Factor
(From Table AC-1)	For Maximum Concentration
0 to 1	3
>1 to 10	2
>10	1.5

* Use ppm value unless the concentration is only expressed in mg/M3

(3) Ceiling Limits. Employee exposures shall be controlled such that the applicable ceiling limit specified in Table AC-1 for any airborne contaminant is not exceeded at any time.

(d) Skin Notation and Protective Clothing. The substances designated by “S” in the skin notation column of Table AC-1 may be absorbed into the bloodstream through the skin, the mucous membranes and/or the eye, and contribute to the overall exposure. Appropriate protective clothing shall be provided for and used by employees as necessary to prevent skin absorption.

Note: The above requirement does not remove the employer's responsibility to provide appropriate protection from corrosive or skin irritating materials which may not bear the “S” designation.

(e) Workplace Monitoring.

(1) Whenever it is reasonable to suspect that employees may be exposed to concentrations of airborne contaminants in excess of levels permitted in section 5155(c), the employer shall monitor (or cause to have monitored) the work environment so that exposures to employees can be measured or calculated.

(2) When exposures to airborne contaminants are found or are expected to exceed allowable levels, measures to control such harmful exposures shall be instituted in accordance with section 5141.

(3) For the adequate protection of employees, the person supervising, directing or evaluating the monitoring and control methods shall be versed in this standard and shall be competent in industrial hygiene practice.

Note: To facilitate the detection of conditions leading to serious overexposures, the screening of the work environment by any person authorized by the employer, using appropriate measuring devices, is encouraged.

(4) All monitoring results shall be recorded and such records shall be retained in accordance with section 3204.

(f) Medical Surveillance. A medical surveillance program approved by the division may be required to ensure satisfactory maintenance of employee health and to ascertain the effectiveness of the control method(s).

Appendix to Section 5155

(A) Computation for Exposures to Contaminants with Independent Health Effects.

The 8-hour time-weighted average concentration (TWA) of a single substance to which an individual is exposed during a workday shall be calculated using the following formula to determine compliance with the PEL specified in Table AC-1.

	C₁T₁ + C₂T₂+ ... C_nT_n
TWA =		,
	8*

where T is the duration in hours of the exposure to a substance at the concentration C. For multiple substances with independent health effects, an independent comparison of each TWA with the corresponding PEL shall be made to determine compliance.

*Note: Eight (8) is used as denominator regardless of total hours of workday.

EXAMPLE: To illustrate the use of this formula, assume Substance A has an 8-hour time weighted average permissible exposure limit of 100 ppm noted in Table AC-1 and an employee is exposed to an airborne concentration of Substance A of 150 ppm for 2 hours, 75 ppm for 3 hours, and 50 ppm for 4 hours during a 9-hour workday:

TWA = [(150 x 2) + (75 x 3) + (50 x 4)]/8* = 91 ppm.

The series of exposures in this example are equivalent to an 8-hour exposure at a concentration of 91 ppm which is below the PEL value of 100 ppm specified for Substance A.

(B) Computation for Exposures to Contaminants with Additive Health Effects.

In the absence of information to the contrary, the adverse health effects of exposure to two or more toxic materials during the workday shall be considered additive and the following formula shall be used for calculating D, the fraction of the allowable daily exposure.

	TWA₁		TWA₂		TWA_n
D =		+		+ ...
	PEL₁		PEL₂		PEL_n

where TWA is the time-weighted average concentration of a particular substances involved in the exposure (as calculated by the formula in Section (A) of this Appendix), and PEL is the corresponding permissible exposure limit for that substance as specified by Table AC-1. The value of D shall not exceed unity.

EXAMPLE: To illustrate the use of this formula, consider the following exposures:

Substance

Actual 8-hour time weighted average (TWA) exposure concentration (ppm)

8-hour time weighted average permissible exposure limit (PEL) (ppm)

1	500	1,000
2	45	200
3	40	200

Substituting in the formula was have

	500		45		40
D =		+		+		= 0.925
	1000		200		200

Since D is less than unity (1), the exposure to multiple contaminants is within acceptable limits.

Health effects for multiple contaminants are not considered additive when different organs of the body are affected by individual substances, or where the same effect (such as narcosis) is produced by two substances but the PEL for one substance is based on another effect. For example, vinyl chloride and toluene can both cause narcotic effects, however, the PEL for vinyl chloride is established to protect against cancer while the PEL for toluene is established to protect against non-carcinogenic effects.

Table AC-1

PERMISSIBLE EXPOSURE LIMITS FOR CHEMICAL CONTAMINANTS

Chemical Abstracts Registry			PEL^(d)		STEL^(o)

Number^(a)	Skin^(b)	Name^(c)	ppm^(e)	mg/M^3(f)	Ceiling^(g)	ppm^(e)	mg/M^3(f)
75070		Acetaldehyde	25	45	C
64197		Acetic acid	10	25	40 ppm	15	37
108247		Acetic Anhydride	5	20	C
67641		Acetone	500	1200	3000 ppm	750	1780
75865		Acetone cyanohydrin as CN	4.7	5	C
75058	S	Acetonitrile	40	70		60	105
98862		Acetophenone	10	49
53963	S	2-Acetylaminofluorene; N-fluoren-2-yl acetamide; see Section 5209

74862		Acetylene	(h)
540590		Acetylene dichloride; see 1,2-Dichloroethylene
79276		Acetylene tetrabromide: 1,1,2,2-tetrabromoethane	1	14
79345		Acetylene tetrachloride; see 1,1,2,2-Tetrachloroethane

50782		Acetylsalicylic acid (Aspirin)	--	5
107028	S	Acrolein	0.1	0.25	C
79061	S	Acrylamide	--	0.03
79107	S	Acrylic acid	2	5.9
107131	S	Acrylonitrile; see Section 5213	2	4.5
124049		Adipic acid	--	5
111693	S	Adiponitrile	2	8.8

309002	S	Aldrin; 1,2,3,4,10,10-hexachloro-1,4,4a,5,8,8a-hexahydro-endo-1,2-exo-5,8-dimethanonaphthalene	--	0.25

107186	S	Allyl alcohol	0.5	1.25		4	10
107051		Allyl chloride	1	3		2	6
106923	S	Allyl glycidyl ether; AGE	0.2	0.93
2179591		Allyl propyl disulfide	2	12		3	18

1344281		Alumina; see Particulates not otherwise regulated
		Aluminum, alkyls (not otherwise classified)	--	2
		Aluminum soluble salts	--	2
		Aluminum metal and oxide	--
		Total dust	--	10
		Respirable fraction⁽ⁿ⁾	--	5⁽ⁿ⁾
		Aluminum pyro powders	--	5
		Aluminum welding fumes	--	5

300925		Aluminum distearate	--	10
7047849		Aluminum stearate	--	10
637127		Aluminum tristearate	--	10
1300738		Aminodimethylbenzene; see Xylidene
92671	S	4-Aminodiphenyl; see Section 5209
141435		2-Aminoethanol; see Ethanolamine
91598		2-Aminonapthalene; see beta-Naphthylamine, Section 5209
504290		2-Aminopyridine	0.5	2
61825		Amitrole	--	0.2
7664417		Ammonia	25	18		35	27
3825261	S	Ammonium perfluorooctanoate	--	0.01
12125029		Ammonium chloride fume	--	10		--	20
1002897		Ammonium stearate	--	10
7773060		Ammonium sulfamate	--
		Total dust	--	10
		Respirable fraction⁽ⁿ⁾	--	5

620111		3-Amyl acetate; see Pentyl acetate
628637		n-Amyl acetate; see Pentyl acetate
626380		sec-Amyl acetate (all isomers and mixtures); see Pentyl acetate
625161		tert-Amyl acetate; see Pentyl acetate
62533	S	Aniline	2	7.6
29191524	S	Anisidine (ortho and para isomers)	0.1	0.5
		Antimony and compounds, as Sb	--	0.5
86884		ANTU; 1-(1-naphthyl)-2-thiourea; Bantu; Rattrack	--	0.3

7440371		Argon	(h)
7440382		Arsenic and inorganic arsenic compounds; see also Section 5214		0.01
		Arsenic, organic compounds, as As	--	0.2
7784421		Arsine; AsH_$3	0.05	0.2

1332-21-4		Asbestos (including actinolite, amosite anthophyllite, chrysotile, crocidolite, and tremolite); see Section 5208

8052424		Asphalt (petroleum) fumes	--	5
1912249		Atrazine	--	5
86500	S	Azinphos methyl; o,o-dimethyl S-(4-oxo-1,2,3-benzotriazin-3(4H)-ylmethyl) phosphorodithioate	--	0.2
3333526	S	2,2′-Azobisisobutyronitrile decomposition product, see Tetramethyl succinonitrile

7440393		Barium, soluble compounds, as Ba	--	0.5
7727437		Barium sulfate; see Particulates not otherwise regulated
17804352		Benomyl
		Total dust	--	10
		Respirable fraction⁽ⁿ⁾	--	5
71432	S	Benzene; see also Section 5218	1			5	--
92875	S	Benzidine; 4,4′-diaminobiphenyl, see Section 5209
71432		Benzol; see Benzene
106514		D-Benzoquinone; see Quinone
98884		Benzoyl chloride	0.2	1.1	C
94360		Benzoyl peroxide; dibenzoyl peroxide	--	5
140114		Benzyl acetate	10	61
100447		benzyl chloride; alpha-chlorotoluene	0.03	0.16
7440417		Beryllium, and beryllium compounds	--	0.0002	0.025mg/M³	--	0.002
		as Be (see also Sections 1535.1, 5205 and 8359.1)
92524		Biphenyl; diphenyl; phenylbenzene	0.2	1.5
542881		Bis(chloromethyl) ether, see bis-Chloromethyl ether, Section 5209

3033623	S	Bis (Dimethylaminoethyl) ether (DMAEE)	0.05	0.328		0.15	0.983
1304821		Bismuth telluride
		Total dust	--	10
		Respirable fraction⁽ⁿ⁾	--	5
		Bismuth telluride (selenium-doped)	--	5

		Borates, tetra, sodium salts
		Anhydrous	--	5
		Decahydrate	--	5
		Pentahydrate	--	5
1303862		Boron oxide	--	10
10294334		Boron tribromide	1	10	C
7637072		Boron trifluoride	1	3	C

314409		Bromacil	1	10
7726956		Bromine	0.1	0.7	C
7789302		Bromine pentafluoride	0.1	0.7
74975		Bromochloromethane; see Chlorobromethane
74964		Bromoethane; see Ethyl bromide

75252	S	Bromoform; tribromomethane	0.5	5
74839		Bromomethane, see Methyl bromide
106945	S	1-bromopropane, n-propyl bromide	5	25
75638		Bromotrifluoromethane; see Trifluorobromomethane

106990		1,3-Butadiene (see also section 5201)	1	2.2		5	11
106978		Butane	800	1,900
109795		1-Butanethiol; see Butyl mercaptan
71363		1-Butanol; see n-Butyl alcohol
78933		2-Butanone; see Methyl ethyl ketone
111762	S	2-Butoxyethanol (EGBE)	20	97

123864		n-Butyl acetate	150	710		200	950
105464		sec-Butyl acetate	200	950
540885		tert-Butyl acetate	200	955
141322		Butyl acrylate	2	11
71363	S	n-Butyl alcohol; 1-butanol	50	150	C
78922		sec-Butyl alcohol	100	305

75650		tert-Butyl alcohol	100	300		150	450
109739	S	Butylamine	5	15	C
1189851	S	tert-Butyl chromate; di-tert-butyl Chromate, as CrO_$3	--	0.1	C
		as Cr		0.005
		(see also Sections 1532.2, 5206 & 8359)
2426086		n-Butyl glycidyl ether; BGE; 1-butoxy-2,3-epoxypropane	25	135

138227		n-Butyl lactate	5	25
109795		n-Butyl mercaptan	0.5	1.5
89725	S	o-sec-Butylphenol	5	30
98511		p-tert-Butyltoluene	1	6.1		20	120

7440439		Cadmium metal dust, as Cd
		(see also Sections 1532 & 5207)	--	0.005
		Cadmium, soluble salts, as Cd
		(see also Sections 1532 & 5207)	--	0.005
1306190		Cadmium oxide fume, as Cd
		(see also Sections 1532 & 5207)	--	0.005
7778441		Calcium arsenate; see Arsenic, inorganic (see also Section 5214)
471341		Calcium carbonate; see Particulates not otherwise regulated	--
156627		Calcium cyanamide	--	0.5
1305620		Calcium hydroxide	--	5
1305788		Calcium oxide	--	2
		Calcium silicate; see Particulates not otherwise regulated
1344952		Calcium silicate (synthetic): see Particulates not otherwise regulated
1592230		Calcium stearate	--	10
7778189		Calcium sulfate; see Particulates not otherwise regulated

76222		Camphor (synthetic)	--	2
105602		Caprolactam dust	--	1		--	3
105602		Caprolactam vapor	5	20		10	40
2425061	S	Captafol	--	0.1
133062		Captan	--	5

63252		Carbaryl; 1-naphthyl N-methylcarbamate	--	5
1563662		Carbofuran	--	0.1
1333864		Carbon black	--	3.5
124389		Carbon dioxide	5,000	9,000		30,000	54,000
75150	S	Carbon disulfide	1	3	30 ppm	12	36
630080		Carbon monoxide	25	29	200 ppm

558134		Carbon tetrabromide	0.1	1.4		0.3	4
56235	S	Carbon tetrachloride	2	12.6	200 ppm	10	63
75445		Carbonyl chloride; see Phosgene
353504		Carbonyl fluoride	2	5		5	15

120809	S	Catechol; pyrocatechol	5	20
9004346		Cellulose (paper fiber); see Particulates not otherwise regulated
21351791		Cesium hydroxide	2

57749	S	Chlordane; 1,2,4,5,6,7,8,8-octachloro-3a,4,7,7a-tetrahydro-4,7-methanoindane	--	0.5
8001352	S	Chlorinated camphene; toxaphene	--	0.5		--	1
		Chlorinated diphenyl oxide	--	0.5

7782505		Chlorine	0.5	1.5		1	3
10049044		Chlorine dioxide	0.1	0.3		0.3	0.9
7790912		Chlorine trifluoride	0.1	0.4	C
107200		Chloroacetaldehyde	1	3	C
78955	S	Chloroacetone	1	3.8	C
532274		alpha-Chloroacetophenone; phenacyl chloride	0.05	0.3
79049	S	Chloroacetyl chloride	0.05	0.2		0.15	0.69
108907		Chlorobenzene; monochlorobenzene	10	46
2698411	S	o-Chlorobenzylidene malononitrile; OCBM	0.05	0.4	C
74975		Chlorobromomethane; bromochloromethane	200	1,050

126998	S	2-Chloro-1,3-butadiene; see Chloroprene
75456		Chlorodifluoromethane; Fluorocarbon 22	1,000	3,500
53469219	S	Chlorodiphenyl (42% chlorine)	--	1
11097691	S	Chlorodiphenyl (54% chlorine)	--	0.5

106898		1-Chloro-2,3-epoxypropane; see Epichlorohydrin
75003		Chloroethane; see Ethyl chloride
107073		2-Chloroethanol; see Ethylene chlorohydrin
75014		Chloroethylene, see Vinyl chloride, Section 5210
67663		Chloroform; trichloromethane	2	9.78
74873		Chloromethane, see Methyl chloride
107302		Chloromethyl methyl ether; see Methyl chloromethyl ether, Section 5209
542881		bis-Chloromethyl ether, see also Section 5209	0.001	0.005
100005		1-Chloro-4-nitrobenzene; see p-Nitrochlorobenzene
600259		1-Chloro-1-nitropropane	2	10

76153		Chloropentafluoroethane	1,000	6,320
76062		Chloropicrin; trichloronitromethane	0.1	0.7
126998	S	Chloroprene; 2-chloro-1,3-butadiene	10	36
598787	S	2-Chloropropionic acid	0.1	0.44
2039874		o-Chlorostyrene	50	285		75	428
95498	S	o-Chlorotoluene	50	250
1929824		2-Chloro-6-(trichloromethyl)pyridine; see Nitrapyrin	--
2921882	S	Chlorpyrifos	--	0.2
		Chromite ore processing (chromate), as Cr	--	0.005
		(see also Sections 1532.2, 5206 & 8359)
7440473		Chromium metal	--	0.5
		Chromium (II) compounds, as Cr	--	0.5
		Chromium (III) compounds, as Cr	--	0.5
		Chromium (VI) compounds, as Cr	--	0.005	0.1 mg/M³
		(see also Sections 1532.2, 5206 & 8359)

14977618		Chromyl chloride	0.025	0.15
2971906		Clopidol	--
		Total dust	--	10
		Respirable fraction	--	5
		Coal (Bituminous) dust
		<5% quartz, respirable fraction⁽ⁿ⁾	--	0.9
		>5% quartz, respirable fraction⁽ⁿ⁾	--	0.1
		Coal tar pitch volatiles⁽ⁱ⁾	--	0.2

7440484		Cobalt, metal fume and dust, as Co	--	0.02
		Cobalt carbonyl, as Co	--	0.1
16842038		Cobalt hydrocarbonyl, as Co	--	0.1
		Coke oven emissions, see Section 5211	--	0.15
7440508		Copper metal fume, as Cu	--	0.1
		Copper salts, dusts and mists, as Cu	--	1

		Corundum, see Particulates not otherwise regulated

		Cotton dust, see also Section 5190	--	1^(j)

1319773	S	Cresol (all isomers)	5	22
123739	S	Crotonaldehyde; beta-methylacrolein			0.3
4170303
299865		Crufomate	--	5
98828	S	Cumene; isopropylbenzene	50	245

420042		Cyanamide	--	2
	S	Cyanide, as CN	--	5
460195		Cyanogen	10	20
506774		Cyanogen chloride	0.3	0.6	C
110827		Cyclohexane	300	1,050
108930	S	Cyclohexanol	50	200
108941	S	Cyclohexanone	25	100
110838		Cyclohexene	300	1,015
108918	S	Cyclohexylamine	10	40
121824	S	Cyclonite; RDX; cyclotrimethylenetrinitramine	--	0.07
542927		Cyclopentadiene	75	200
287923		Cyclopentane	600	1,720
13121705		Cyhexatin; tricyclohexyltin hydroxide		5
94757		2,4-D;2,4-dichlorophenoxyacetic acid	--	10

50293	S	DDT; 1,1,1-trichloro-2,2-bis-(p-chlorophenyl)ethane	--	1
62737		DDVP, see Dichlorvos
17702419	S	Decaborane	0.05	0.3		0.15	0.9

8065483	S	Demeton; a mixture of o,o-diethyl o-2(ethylthio)ethyl phosphorothloate and o,o'-diethyl S-2(ethylthio)ethyl phosphorothioate	0.01	0.1

123422		Diacetone alcohol; 4-hydroxy-4-methyl-2-pentanone	50	240
107153		1,2-Diaminoethane; see Ethylenediamine Diatomacous earth; see Silica-amorphous
333415	S	Diazinon; o,o-diethyl o-(2-isopropyl-6-methyl-4-pyrimidinyl) phosphorothioate	--	0.1

334883		Diazomethane	0.2	0.4
94360		Dibenzoyl peroxide; see Benzoyl peroxide
19287457		Diborane	0.1	0.1
2528361	S	Dibutyl phenyl phosphate	0.3	3.5
96128		1,2-Dibromo-3-chloropropane; DBCP; see Section 5212	.001	.01
75616		Dibromodifluoromethane; see Difluorodibromomethane
106934	S	1,2-Dibromoethane; see Ethylene dibromide, Section 5219

102818	S	2-N-Dibutylaminoethanol	2	14
107664		Dibutyl phosphate	1	5		2	10
84742		Dibutyl phthalate	--	5

7572294		Dichloroacetylene	0.1	0.4	C
95501	S	o-Dichlorobenzene	25	150	50 ppm
106467		p-Dichlorobenzene; 1,4-dichlorobenzene	10	60	200 ppm	110	675
91941	S	3,3'-Dichlorobenzidine; 4,4'-diamino-3,3'-dichlorobiphenyl; see Section 5209
764410	S	1,4-Dichloro-2-butene	0.005	0.025

75718		Dichlorodifluoromethane	1000	4950	6200 ppm

118525		1,3-Dichloro-5,5-dimethyl hydantoin	--	0.2		--	0.4
75343		1,1-Dichloroethane	100	400
107062		1,2-Dichloroethane, see Ethylene dichloride

75354		1,1-Dichloroethylene; see Vinylidene chloride
540590		1,2-Dichloroethylene; acetylene dichloride	200	790
111444	S	Dichloroethyl ether; bis(2-chloroethyl) ether	5	30		10	60

75434		Dichlorofluoromethane; Fluorocarbon 21	10	42
75092		Dichloromethane; see Methylene chloride
594729		1,1-Dichloro-1-nitroethane	2	10
78875		1,2-Dichloropropane; see Propylene dichloride
542756	S	Dichloropropene	1	5
75990		2,2-Dichloropropionic acid	1	6
76142		1,2-Dichlorotetrafluoroethane; Fluorocarbon 114	1,000	7,000
62737	S	Dichlorvos (DDVP); 2,2-dichlorovinyl dimethyl phosphate	0.1	1
141662	S	Dicrotophos	--	0.25

5124301		Dicyclohexylmethane-4,4'-diisocyanate; see Methylene bis-(4-cyclohexylisocyanate)
77736		Dicyclopentadiene	5	30
102545		Dicyclopentadienyl iron	--
		Total dust	--	10
		Respirable fraction⁽ⁿ⁾	--	5

60571	S	Dieldrin; 1,2,3,4,10,10-hexachloro-6,7-epoxy-1,4,4a,5,6,7,8,8a-octahydro-1,4-endo-exo-5,8-dimethanonaphthalene	--	0.25

111422	S	Diethanolamine	0.46	2
109897	S	Diethylamine	5	15	C
112367	S	Diethylene glycol diethyl ether, Ethyl diglyme	5	33
111966	S	Diethylene glycol dimethyl ether, Diglyme	1	5.5		5	27
100378	S	2-(Diethylamino) ethanol	2	9.6
123911		1,4-Diethylene dioxide; see p-Dioxane
111400S		Diethylenetriamine	1	4

60297		Diethyl ether; see Ethyl ether
117817		Di-(2-ethylhexyl) phthalate; see Di-sec-octyl phthalate
96220		Diethyl ketone	200	705		300	1057
84662		Diethyl phthalate	--	5

75616		Difluorodibromomethane; dibromodifluoromethane	100	860
2238075		Diglycidyl ether; DGE; bis(2,3-epoxypropyl) ether	0.1	0.5
123319		p-Dihydroxybenzene; see Hydroquinone

108838		Diisobutyl ketone; 2,6-dimethyl-4-heptanone	25	150
108189	S	Diisopropylamine	5	20
108203		Diisopropyl ether; see Isopryl ether

109875		Dimethoxymethane; see Methylal
127195	S	Dimethylacetamide	10	35
124403		Dimethylamine	5	9.2		15	27.6
60117		4-Dimethylaminoazobenzene, see Section 5209
1300738		Dimethylaminobenzene; see Xylidene
121697	S	N,N-Dimethylaniline; dimethylphenylamine	5	25		10	50
1330207		Dimethylbenzene; see Xylene
108849		1,3-Dimethylbutyl acetate; see sec-Hexyl acetate

300765		o,o-Dimethyl o-(1,2-dibromo-2,2-dichloroethyl) phosphate; see Naled
14857342		Dimethylethoxysilane	0.5	2.1		1.5	6.4
68122	S	Dimethylformamide; DMF	10	30
108838		2,6-Dimethyl-4-heptanone; see Diisobutyl ketone
57147	S	1,1-Dimethylhydrazine	0.01	0.025
67641		Dimethyl ketone; see Acetone
62759		N,N-Dimethylnitrosamine; see N-Nitrosodimethylamine, Section 5209
131113		Dimethyl phthalate	--	5
77781	S	Dimethyl sulfate; methyl sulfate	0.1	0.5

148016		Dinitolmide; 3,5-Dinitro-o-toluamide	--	5
528290, 99650, 100254	S	Dinitrobenzene (all (isomers) ortho, meta and para isomers	0.15	1
534521	S	4,6-Dinitro-o-cresol; 2-methyl-4,6-dinitrophenol	--	0.2
25321146	S	2,4-Dinitrotoluene	--	0.15

123911	S	p-Dioxane;
		1,4-dioxacyclohexane;	0.28	1.0
		1,4-diethylene dioxide
78342	S	Dioxathion	--	0.2

92524		Diphenyl; see Biphenyl
122394		Diphenylamine; N-phenylaniline	--	10
101688		Diphenylmethane diisocyanate; see Methylene bis(phenylisocyanate)

123193		Dipropyl ketone	50	235
34590948	S	Dipropylene glycol methyl ether	100	600		150	900
85007		Diquat; 1,1'-ethylene-2,2'-dipyridinium dibromide	--
		Total dust	--	0.5
		Respirable fraction⁽ⁿ⁾	--	0.1

117817		Di-sec-octyl phthalate; bis(2 ethylhexyl) phthalate	--	5		--
97778		Disulfiram	--	2
298044	S	Disulfoton; o,o-diethyl S-2-(ethylthio)ethyl phosphorodithioate	--	0.1
128370		2,6-Di-tert-butyl-p-cresol	--	10
330541		Diuron	--	10

68122		DMF; see Dimethylformamide
57147		DMH; see 1,1-Dimethylhydrazine
1321740		Divinyl benzene	10	50
		Dust, nuisance dust and particulates, see Particulates not otherwise regulated

12415348		Emery; see Particulates not otherwise regulated
115297	S	Endosulfan; 6,7,8,9,10,10-hexachloro-1,5,5a,6,9,9a-hexahydro-6,9-methano-2,4, 3-benzodioxathiepin-3-oxide	--	0.1

72208	S	Endrin; 1,2,3,4,10,10-hexachloro-6,7-epoxy-1,4,4a,5,6,7,8,8a-octahydro-1,4-endo-endo-5, 8-dimethanonaphthalene	--	0.1

13838169		Enflurane	2	15
106898	S	Epichlorohydrin; 1-chloro-2, 3-epoxypropane	0.05	0.19
2104645	S	EPN; o-ethyl o-(p-nitrophenyl) phenylphosphonothioate	--	0.1
75569		1,2-Epoxypropane; see Propylene oxide
556525		2,3-Epoxypropanol; see Glycidol

74840		Ethane	(h)	--
75081		Ethanethiol; see Ethyl mercaptan
64175		Ethanol; see Ethyl alcohol
141435		Ethanolamine; 2-aminoethanol	3	8		6	15
563122	S	Ethion	--	0.4
110805	S	2-Ethoxyethanol	5	18
111159	S	2-Ethoxyethyl acetate	5	27

141786		Ethyl acetate	400	1,400
140885	S	Ethyl acrylate	5	20		25	100
64175		Ethyl alcohol; ethanol	1,000	1,900
75047	S	Ethylamine	5	9.2	C
541855		Ethyl sec-amyl ketone; 5-methyl-3-heptanone	25	130

100414		Ethylbenzene	5	22		30	130
74964	S	Ethyl bromide	5	22
106354		Ethyl butyl ketone; 3-heptanone	50	230		75	345
75003	S	Ethyl chloride; chloroethane	100	264
7085850		Ethyl cyanoacrylate	0.2	1.02
637923		Ethyl tert-butyl ether	5	21
74851		Ethylene	(h)	--

107073	S	Ethylene chlorohydrin; 2-chloroethanol	1	3	C
107153		Ethylenediamine; 1,2-diaminoethane	10	25
106934	S	Ethylene dibromide; 1,2-dibromoethane, see Section 5219	0.13	1	C
107062		Ethylene dichloride; 1,2-dichloroethane	1	4	200 ppm	2	8

107211		Ethylene glycol (vapor)	40	100	C
629141	S	Ethylene glycol diethyl ether, 1,2-diethoxyethane	5	24
110714	S	Ethylene glycol dimethyl ether, 1,2-dimethoxyethane, Glyme	1	3.7		5	18
628966	S	Ethylene glycol dinitrate		(k)		--	0.1
110805	S	Ethylene glycol monoethyl ether, see 2-Ethoxyethanol
109864	S	Ethylene glycol monomethyl ether, see 2-Methoxyethanol

110496	S	Ethylene glycol monomethyl ether acetate; see 2-Methoxyethyl acetate
151564	S	Ethyleneimine; see also Section 5209	0.5	1
75218		Ethylene oxide; see Section 5220	1	2		5

60297		Ethyl ether	400	1,200		500	1500
109944		Ethyl formate	100	300
75343		Ethylidene chloride; see 1,1-Dichloroethane
16219753		Ethylidene norbornene	5	25	C

75081		Ethyl mercaptan; ethanethiol	0.5	1
78933		Ethyl methyl ketone; see Methyl ethyl ketone
100743	S	N-Ethylmorpholine; 4-ethyl-1, 4-tetrahydrooxazine	5	23
78104		Ethyl silicate; tetraethyl silicate	10	85
22224926	S	Fenamiphos		0.1
115902		Fensulfothion	--	0.1
55389	S	Fenthion	--	0.2
14484641		Ferbam; ferric N,N-dimethylthiocarbamate	--	10
12604589		Ferrovanadium dust	--	1		--	3
14808607		Fibrous glass, see Glass
		Flour dust		0.5^(s)
		Fluorides, as F	--	2.5
7782414		Fluorine	0.1	0.2

75694		Fluorocarbon 11; see Trichlorofluoromethane
75718		Fluorocarbon 12; see Dichlorodifluoromethane
75434		Fluorocarbon 21; see Dichlorofluoromethane

75456		Fluorocarbon 22; see Chlorodifluoromethane
76120		Fluorocarbon 112; see 1,1,2,2-Tetrachloro-1,2-difluoroethane
76131		Fluorocarbon 113; see 1,1,2-Trichloro-1,2,2-trifluoroethane

		Fluorocarbon 114; see 1,2-Dichlorotetrafluoroethane
75694		Fluorotrichloromethane; see Trichlorofluoromethane
944229	S	Fonofos	--	0.1

50000		Formaldehyde, see Section 5217	0.75	--		2	--
75127	S	Formamide	10	18
64186		Formic acid	5	9		10	19
98011	S	Furfural	2	8
98000	S	Furfuryl alcohol	10	40		15	60

8006619		Gasoline	300	900		500	1500
7782652		Germanium tetrahydride	0.2	0.6
		Glass, fibrous	1.0 f/cc^(q)

111308		Glutaraldehyde^(t)	0.05	0.2	C
56815		Glycerin mist; see Particulates not otherwise regulated
123944		Glyceryl stearate	--	10
556525		Glycidol; 2,3-epoxy-1-propanol	2	6.1

111762		Glycol monobutyl ether; see 2-Butoxyethanol
110805		Glycol monoethyl ether; see 2-Ethoxyethanol
109864		Glycol monomethyl ether; see 2-Methoxyethanol
107222		Glyoxal, 1,2-ethanedione	--	0.1^{(s), (u)}
		Grain dust (oat, wheat, barley)	--	10
7782425		Graphite, natural respirable dust		2.5
		Graphite, synthetic
		Total dust	--	10
		Respirable fraction⁽ⁿ⁾	--	5
13397245		Gypsum; Calcium sulfate dihydrate; see Particulates not otherwise regulated

7440586		Hafnium	--	0.5

151677		Halothane	2	16
822060		HDI; see Hexamethylene diisocyanate
7440597		Helium	(h)	--
76448	S	Heptachlor; 1,4,5,6,7,8,8-hepta-chloro-3a,4,7,7a-tetrahydro-4,7-methanoindene	--	0.05
142825		n-Heptane	400	1,600		500	2000
118741	S	Hexachlorobenzene	--	0.002
87683	S	Hexachlorobutadiene	0.02	0.24
77474		Hexachlorocyclopentadiene	0.01	0.11
67721	S	Hexachloroethane; perchloroethane	1	10
1335871	S	Hexachloronaphthalene	--	0.2
684162	S	Hexafluoroacetone; 1,1,1,3,3,3-hexafluoro-2-propanone	0.1	0.7
822060		Hexamethylene diisocyanate; HDI	0.005	0.034
110543	S	n-Hexane	50	180
		Hexane, other isomers	500	1800		1000	3600
124094		1,6-Hexanediamine	0.5	2.3
591786		2-Hexanone; see Methyl butyl ketone
592416		1-Hexene	50	180
108101		Hexone; see Methyl isobutyl ketone

108849		sec-Hexyl acetate; 4-methyl-2-pentyl acetate; 1,3-dimethyl-butyl acetate	50	300
107415		Hexylene glycol	25	125	C
302012	S	Hydrazine	0.01	0.013
10035106		Hydrobromic acid; see Hydrogen bromide
7647010		Hydrochloric acid; see Hydrogen chloride
74908		Hydrocyanic acid; see Hydrogen cyanide
7664393		Hydrofluoric acid; see Hydrogen fluoride

1333740		Hydrogen	(h)	--
61788327		Hydrogenated terphenyls	0.5	5
10035106		Hydrogen bromide	3	10	C
7647010		Hydrogen chloride	0.3	0.45	2 ppm
74908	S	Hydrogen cyanide	4.7	5	C
7664393	S	Hydrogen fluoride, as F	0.4	0.33		1	0.83
7722841		Hydrogen peroxide, as H_$2O_$2	1	1.4
7783075		Hydrogen selenide, as Se	0.05	0.2
7783064		Hydrogen sulfide	10	14	50 ppm	15	21
123319		Hydroquinone; 1,4-benezendiol	--	2
999611	S	2-Hydroxypropyl acrylate	0.5	3

95136		Indene	10	48
7440746		Indium	--	0.1
		Indium compounds	--	0.1
7553562		Iodine	0.1	1	C
75478		Iodoform	0.6	10
4098719		IPDI; see Isophorone diisocyanate

1309371		Iron oxide fume	--	5
13463406		Iron pentacarbonyl, as Fe	0.1	0.8		0.2	1.6
		Iron salts, soluble, as Fe	--	1

123922		Isoamyl acetate; 3-methylbutyl acetate; see Pentyl acetate
123513		Isoamyl alcohol; 3-methylbutanol	100	360		125	450
110190		Isobutyl acetate; 2-methylpropyl acetate	150	700

78831		Isobutyl alcohol; 2-methylpropanol	50	150
26675467		Isoflurane	2	15
26952216	S	Isooctyl alcohol	50	270
78591		Isophorone; 3,5,5-trimethyl-2-cyclohexene-1-one	4	23
4098719	S	Isophorone diisocyanate; IPDI	0.005	0.045		0.02	--
109591		Isopropoxyethanol	25	105
108214		Isopropyl acetate	250	950		310	1185
67630		Isopropyl alcohol	400	980		500	1225
75310		Isopropylamine	5	12		10	24
768525	S	N-isopropylaniline	2	10
108203		Isopropyl ether; diisopropyl ether	250	1,050
4016142		Isopropyl glycidyl ether; IGE; 1,2-epoxy-3-isopropoxypropane	50	240		75	360

1332587		Kaolin; (respirable dust containing no asbestos and <1% crystaline silica)	--	2
463514		Ketene; ethenone	0.5	0.9		1.5	3

		Lead arsenate, see Sections 5214 and 5198
7758976		Lead chromate, as Pb	--	0.01
		as Cr	--	0.005
		(see also Sections 5198, 1532.1, 1532.2, 5206 & 8359)
7439921		Lead (metallic) and inorganic compounds, dust and fume, as Pb	--	0.01
		(see also Sections 5198 & 1532.1)
78002		Lead tetraethyl, see Tetraethyl lead
75741		Lead tetramethyl, see Tetramethyl lead
1317653		Limestone; calcium carbonate; see Particulates not otherwise regulated
58899	S	Lindane; 1,2,3,4,5,6-hexachlorocyclohexane, gamma isomer	--	0.5
7580678		Lithium hydride	--	0.025
		L.P.G.; liquefied petroleum gas	1,000	1,800
4485125		Lithium stearate	--	10

13717005		Magnesite; magnesium carbonate; see Particulates not otherwise regulated
1309484		Magnesium oxide fume, as Mg	--	10
557040		Magnesium stearate	--	10
121755	S	Malathion; o,o-dimethyl S-1(1,2-dicarboethyoxyethyl) phosphorodithioate	--	10
108316		Maleic anhydride; cis-butenedioic anhydride	0.1	0.4

		Manganese and compounds, as Mn	--	0.2
7439965		Manganese fume, as Mn	--	0.2		--	3
12079651	S	Manganese, cyclopentadienyl-tricarbonyl, as Mn	--	0.1
		Manganese tetroxide	--	0.2

		Marble; calcium carbonate; see Particulates not otherwise regulated
101779	S	MDA; see 4,4′-Methylene dianiline
101688		MDI; see Methylene bis(phenylisocyanate)

7439976	S	Mercury alkyls, as Hg	--	0.01	0.04 mg/M³	--	0.03
7439976	S	Mercury, metallic and inorganic compounds as Hg	--	0.025	0.1 mg/M³
7439976	S	Mercury aryl compounds as Hg		0.1	C

108678		Mesitylene; see 1,3,5-Trimethylbenzene
141797		Mesityl oxide; 4-methyl-3-pentene-2-one	15	60		25	100
79414	S	Methacrylic acid	20	70
74828		Methane	(h)	--
74931		Methanethiol; see Methyl mercaptan
67561		Methanol; see Methyl alcohol
16752775	S	Methomyl	--	2.5
72435		Methoxychlor; 1,1,1-trichloro-2, 2-bis(p-methoxyphenyl)ethane	--	10
109864	S	2-Methoxyethanol	5	16
110496		2-Methoxyethyl acetate	5	24
76380		Methoxyflurane	2	13
150765		4-Methoxyphenol	--	5

79209		Methyl acetate	200	610		250	760
74997		Methyl acetylene; propyne	1,000	1,650
		Methyl acetylene-propadiene mixture; MAPP	1,000	1,800		1250	2250
96333	S	Methyl acrylate	10	35
126987	S	alpha-Methylacrylonitrile	1	3
624419		2-Methylbutyl acetate; see Pentyl acetate
109875		Methylal; dimethoxymethane	1,000	3,100
67561	S	Methyl alcohol; methanol	200	260	1000 ppm	250	325
74895		Methylamine	5	6.4		15	19
108112		Methyl amyl alcohol; see Methyl isobutyl carbinol
110430		Methyl n-amyl ketone; 2-heptanone	50	235

100618	S	N-Methylaniline; monomethylaniline	0.5	2
95534		o-Methylaniline; see o-Toluidine
74839	S	Methyl bromide	1	3.88	20 ppm
591786	S	Methyl n-butyl ketone; 2-hexanone	1	4		10	40
74873		Methyl chloride	50	105	300 ppm	100	210

71556		Methyl chloroform; 1,1,1-trichloroethane	350	1900	800 ppm	450	2450
107302		Methyl chloromethyl ether; see Section 5209
75058		Methyl cyanide; see Acetonitrile
137053		Methyl 2-cyanoacrylate	0.2	0.908

108872		Methylcyclohexane	400	1,600
25639423		Methylcyclohexanol (meta- and para-isomer mixture)	50	235
583608	S	o-Methylcyclohexanone	50	230		75	345
12108133	S	2-Methylcyclopentadienyl manganese tricarbonyl, as Mn	--	0.2

8022002	S	Methyl demeton; a mixture of o,o-dimethyl o-(2-(ethylthio)ethyl) phosphorothioate and o,o-dimethyl S-(2-(ethylthio)-ethyl) phosphorothioate	--	0.5

101144	S	4,4′-Methylene bis(2-chloroaniline), see also Section 5215	--	0.01
5124301		Methylene bis(4-cyclohexylisocyanate); hydrogenated MDI	0.005	0.054

101688		Methylene bis(phenylisocyanate); MDI; diphenylmethane diisocyanate	0.005	0.051
75092		Methylene chloride; dichloromethane (see also section 5202)	25	87		125	435
101779	S	4,4′-Methylene dianiline; MDA (see also Sections 1535 & 5200)	0.01	0.08		0.1	0.8
78933		Methyl ethyl ketone; MEK; 2-butanone; ethyl methyl ketone	200	590		300	885
1338234		Methyl ethyl ketone peroxide	0.2	1.5	C
107313		Methyl formate	100	250		150	375
60344	S	Methyl hydrazine; monomethyl hydrazine	0.01	0.019
74884	S	Methyl iodide	2	10
110123		Methyl isoamyl ketone	50	234
108112	S	Methyl isobutyl carbinol; 4-methyl-2-pentanol; methyl amyl alcohol	25	100		40	165
108101		Methyl isobutyl ketone; Hexone	50	205		75	300

624839	S	Methyl isocyanate	0.02	0.05
563804		Methyl isopropyl ketone	200	705
74931		Methyl mercaptan	0.5	1
80626		Methyl methacrylate; methyl 2-methyl-2-propenoate	50	205		100	410

298000	S	Methyl parathion; o,o-dimethyl o-(p-nitrophenyl) phosphorothioate	--	0.2
107879		Methyl propyl ketone; 2-pentanone	200	700		250	875

872504	S	N-Methylpyrrolidone (NMP)	1	4
		1-Methy1-2-pyrrolidone;
		N-Methyl-2-pyrrolidone;
		1-Methy1-2-pyrrolidinone
681845		Methyl silicate; tetramethyl silicate	1	6
98839		alpha-Methylstyrene; 1-methyl-1-phenylethene	50	240		100	485
77781		Methyl sulfate; see Dimethyl sulfate
1634044		Methyl tert-butyl ether; MTBE	40	144
78944	S	Methyl vinyl ketone	0.05	0.14	C
21087649		Metribuzin	--	5

7786347	S	Mevinphos; 2-carbomethoxyl-1-propen-2-yl dimethyl phosphate	0.01	0.1		0.03	0.3
		Mica, see Silicates
		Mineral wool fiber; see Particulates not otherwise regulated

7439987		Molybdenum, insoluble compounds, as Mo	--	0.5⁽ⁿ⁾
		Total dust	--	10
		Respirable fraction ⁽ⁿ⁾	--	3
		Molybdenum, soluble compounds, as Mo	--	0.5⁽ⁿ⁾

6923224		Monocrotophos	--	0.25
100618		Monomethylaniline; see N-Methylaniline
60344		Monomethylhydrazine; see Methyl hydrazine

110918	S	Morpholine; tetrahydro-4H-1, 4-oxazine	20	70		30	105
7647010		Muriatic acid; see Hydrogen chloride

300765	S	Naled; o,o-dimethyl o-(1,2-dibromo-2,2-dichloroethyl) phosphate	--	3
8030317		Naphtha, coal tar	100	400
91203	S	Naphthalene	0.1	0.5
134327		alpha-Naphthylamine; 1-naphthylamine, see Section 5209

91598		beta-Naphthylamine; 2-naphthylamine, see Section 5209
63252		1-Naphthyl N-methylcarbamate; see Carbaryl
25551284		Naphthalene diisocyanate; NDI	0.01	0.085	C
7440019		Neon	(h)
13463393		Nickel carbonyl; Ni (CO)_$4	0.001	0.007
7440020		Nickel metal, as Ni	--	0.5
		Nickel, insoluble compounds, as Ni	--	0.1
		Nickel, soluble compounds, as Ni	--	0.05
12035722		Nickel subsulfide	--	.05
54115	S	Nicotine; 1-methyl-2-(3-pyridyl)-pyrrolidine	0.075	0.5
1929824		Nitrapyrin	--
		Total dust	--	10
		Respirable fraction⁽ⁿ⁾	--	5
7697372		Nitric acid	2	5		4	10
10102439		Nitric oxide; NO	25	30

100016	S	p-Nitroaniline	--	3
98953	S	Nitrobenzene	1	5
100005	S	p-Nitrochlorobenzene; 1-chloro-4-nitrobenzene	0.1	0.64
92933		4-Nitrodiphenyl, see Section 5209
79243		Nitroethane	100	310

7727379		Nitrogen	(h)	--
10102440		Nitrogen dioxide				1	1.8
		Nitrogen tetroxide; N_$2O_$4; see Nitrogen dioxide
7783542		Nitrogen trifluoride	10	29

55630	S	Nitroglycerin		(k)		--	0.1
75525		Nitromethane	2	5
108032		1-Nitropropane	25	90
79469		2-Nitropropane	10	35
62759		N-Nitrosodimethylamine, see Section 5209

1321126, 99081, 88722, 99990	S	Nitrotoluene	2	11
76062		Nitrotrichloromethane; see Chloropicrin
0024972		Nitrous oxide	50	90
111842		Nonane	200	1,050

		Nuisance particulates, see Particulates not otherwise regulated Total dust	--	10
		Respirable fraction⁽ⁿ⁾	--	5
2234131	S	Octachloronaphthalene	--	0.1		--	0.3
111659		Octane	300	1,450		375	1800
8012951		Oil (mineral) mist, particulate	--	(5)^(l)
		Oil (vegetable) mists (except castor, cashew nut or similar irritant oils); see Nuisance particulates

		Organic arsenic compounds; see Arsenic, organic
20816120		Osmium tetroxide, as Os	0.0002	0.002		0.0006	0.006
144627		Oxalic acid	--	1		--	2
7783417		Oxygen difluoride	0.05	0.1	C
10028156		Ozone	0.1	0.2		0.3	0.6
8002742		Paraffin wax fume	--	2
1910425,	S	Paraquat, total particulates	--	0.5
2074502
1910425,	S	Paraquat, respirable sizes	--	0.1⁽ⁿ⁾
2074502
56382	S	Parathion; o,o-diethyl o-(p-nitrophenyl) phosphorothioate	--	0.1
		Particulates not otherwise regulated Total dust	--	10
		Respirable fraction⁽ⁿ⁾	--	5
		Particulate polycyclic aromatic hydrocarbons (PPAH); see Coal tar pitch volatiles
		PCB; see Chlorodiphenyl
87865	S	PCP; see Pentachlorophenol

19624227		Pentaborane	0.005	0.01		0.015	0.03
1321648	S	Pentachloronaphthalene	--	0.5
87865	S	Pentachlorophenol; PCP	--	0.5
115775		Pentaerythritol; tetrakis-(hydroxymethyl)methane; tetra-methylolmethane; see Particulates not otherwise regulated
109660		Pentane	600	1,800
107879		2-Pentanone; see Methyl propyl ketone
628637; 626380; 123922; 625161; 620111; 624419		Pentyl acetate	50	266		100	532
67721		Perchloroethane; see Hexachloroethane
127184		Perchloroethylene	25	170	300 ppm	100	685
594423		Perchloromethyl mercaptan; trichloromethanethiol	0.1	0.8
7616946		Perchloryl fluoride; C10_$3F	3	14		6	28
382218		Perfluoroisobutylene	0.01	0.082	C
		Perlite
		Total dust	--	10
		Respirable fraction⁽ⁿ⁾	--	5

108952	S	Phenol	5	19
92842	S	Phenothiazine; dibenzothiazine	--	5
106503	S	p-Phenylenediamine	--	0.1
101848		Phenyl ether, vapor	1	7
100425		Phenylethylene; see Styrene

122601	S	Phenyl glycidyl ether, PGE; 1,2-epoxy-3-phenoxypropane	0.1	0.6
100630	S	Phenylhydrazine	5	20		10	45
108985		Phenyl mercaptan	0.5	2
638211		Phenylphosphine	0.05	0.25	C

298022	S	Phorate; o,o-diethyl S-(ethylthio)methyl phosphorodithioate	--	0.05		--	0.2
75445		Phosgene; carbonyl chloride; COCl_$2	0.1	0.4
7803512		Phosphine; PH_$3	0.3	0.4		1	1
7664382		Phosphoric acid	--	1		--	3
7723140		Phosphorus, yellow	--	0.1
10025873		Phosphorus oxychloride	0.1	0.6
10026138		Phosphorus pentachloride	0.1	1
1314803		Phosphorus pentasulfide; P_$2S_$5	--	1		--	3
7719122		Phosphorus trichloride	0.2	1.5		0.5	3
85449		Phthalic anhydride	1	6
626175		m-Phthalodinitrile	--	5
1918021		Picloram	--
		Total dust	--	10
		Respirable fraction⁽ⁿ⁾	--	5
88891	S	Picric acid; 2,4,6-trinitrophenol	--	0.1
83261		Pindone; 2-pivalyl-1, 3-indandione		0.1
142643		Piperazine dihydrochloride	--	5
26499650		Plaster of Paris; calcium sulfate hemihydrate; see Particulates not otherwise regulated

7440064		Platinum, metal	--	1
		Platinum, soluble salts, as Pt	--	0.002
		Polychlorobiphenyls, see Chlorodiphenyl
		Polytetrafluoroethylene, decomposition products	--	(m)

		Portland Cement; see Particulates not otherwise regulated
1310583		Potassium hydroxide; caustic potash	--	2	C
593293		Potassium stearate	--	10
74986		Propane	1000	1800^(h)
107197	S	Propargyl alcohol; 2-propyn-1-o1	1	2

57578		beta-Propiolactone, see Section 5209	0.5	1.5
79094		Propionic acid	10	30
114261		Propoxur; 2-isopropoxyphenyl N-methyl carbamate		0.5
109604		n-Propyl acetate	200	840		250	1050
71238	S	n-Propyl alcohol	200	500		250	625

115071		Propylene	(h)	--
78875		Propylene dichloride; 1,2-dichloropropane	75	350		110	510
6423434	S	Propylene glycol dinitrate; PGDN	0.05	0.3
107982	S	Propylene glycol monomethyl ether	100	360		150	540
108656	S	Propylene glycol monomethyl ether acetate	100	541		150	811

75558	S	Propyleneimine; 2-methylaziridine	2	5
75569		Propylene oxide; 1,2-epoxy-propane	2	4.75
627134		n-Propyl nitrate	25	107		40	170
74997		Propyne; see Methylacetylene
8003347		Pyrethrum	--	5
110861		Pyridine	5	15

106514		Quinone	0.1	0.4

121824		RDX; see Cyclonite
		Refractory ceramic fiber		0.2 f/cc^(q)
108463		Resorcinol	10	45		20	90
7440166		Rhodium, metal	--	0.1
		Insoluble compounds, as Rh	--	0.1
		Soluble salts, as Rh	--	0.001
299843		Ronnel; o,o-dimethyl o-(2,4,5-trichlorophenyl) phosphorothioite	--	10
		Rosin core solder, pyrolysis products, as formaldehyde	--	0.1

83794		Rotenone, commercial	--	5
1309371		Rouge; see Particulates not otherwise regulated
		Rubber solvent (Naphtha)	400	1,600

		Selenium compounds, as Se	--	0.2
7783791		Selenium hexafluoride	0.05	0.4
136787		Sesone; sodium 2,4-dichloro-phenoxyethyl sulfate
		Total dust	--	10
		Respirable fraction⁽ⁿ⁾	--	5
61790532		Silica, amorphous Diatomaceous earth
		Total dust	--	6
		Respirable fraction⁽ⁿ⁾	--	3
		Precipitated and gel	--	6

		Silica, crystalline, respirable dust⁽ⁿ⁾
14464461		Cristobalite,	--	0.05
		(see also Sections 1532.3 & 5204)
14808607		Quartz,	--	0.05
		(see also Sections 1532.3 & 5204)
60676860		Silica, fused, respirable dust	--	0.1
15468323		Tridymite,	--	0.05
		(see also Sections 1532.3 & 5204)
1317959		Tripoli, (as quartz)	--	0.05
		(see also Sections 1532.3 & 5204)

		Silicates (<1% crystalline silica)
12001262		Mica (respirable dust)	--	3
		Soapstone, total dust	--	6
		Soapstone, respirable dust	--	3

		Talc (containing asbestos); see Section 5208
14807966		Talc (containing no asbestos fibers), respirable dust	--	2
		Tremolite (containing no asbestos fibers), respirable dust	--	2

7440213		Silicon; see Particulates not otherwise regulated
409212		Silicon carbide; SiC; see Particulates not otherwise regulated
7803625		Silicon tetrahydride; silane	5	7

7440224		Silver metal, as Ag	--	0.01
		Silver, soluble compounds, as Ag	--	0.01
		Soapstone, see Silicates
26628228	S	Sodium azide	0.1	0.3	C
7631905		Sodium bisulfite	--	5
136787		Sodium 2,4-dichlorophenoxyethyl sulfate; see Sesone
62748	S	Sodium fluoroacetate	--	0.05		--	0.15
1310732		Sodium hydroxide; caustic soda	--	2	C
7681574		Sodium metabisulfite	--	5
822162		Sodium stearate	--	10

9005258		Starch; see Particulates not otherwise regulated
7789062		Strontium chromate, as Cr (see also Sections 1532.2, 5206 & 8359) Stearates; see specific compound	--	0.0005

7803523		Stibine; SbH_$3	0.1	0.5
8052413		Stoddard solvent	100	525
57249		Strychnine	--	0.15

100425	S	Styrene (monomer); phenylethylene	50	215	500 ppm	100	425
9014011		Subtilisins (as pure crystalline proteolytic enzymes)	--				0.00006^(r)
57501		Sucrose; see Particulates not otherwise regulated
74222972		Sulfometuron methyl	--	3.5
3689245	S	Sulfotep; tetraethyl dithionopyrophosphate		0.2
7446095		Sulfur dioxide	2	5		5	10
2551624		Sulfur hexafluoride	1,000	6,000
7664939		Sulfuric acid	--	0.1		--	3
10025679		Sulfur monochloride; S_$2Cl_$2	1	6	C
5714227		Sulfur pentafluoride; S_$2F_$10	0.01	0.1	C
7783600		Sulfur tetrafluoride	0.1	0.4	C
2699798		Sulfuryl fluoride; SO_$2F_$2	5	20		10	40
35400432		Sulprofos		1
93765		2,4,5-T;2,4,5-trichlorophenoxyacetic acid Talc; see Silicates	--	10
7440257		Tantalum metal dust, as Ta	--	5
1314610		Tantalum oxide dust, as Ta	--	5

78308		TCP; see Triorthocresyl phosphate
584849		TDI; see Toluene-2,4-diisocyanate
3689245	S	TEDP; see Sulfotep

		Tellurium and compounds, as Te	--	0.1
7783804		Tellurium hexafluoride	0.02	0.2
3383968		Temephos; o,o,o′ ,o′-tetramethyl o,o′-thiodi-p-phenylene phosphorothioate Total dust	--	10
		Respirable fraction⁽ⁿ⁾	--	5

107493	S	TEPP; tetraethyl pyrophosphate;	0.004	0.05
100210		Terephthalic acid	--	10
		Terphenyls	0.5	5	C
79276		1,1,2,2-Tetrabromoethane; see Acetylene tetrabromide
76119		1,1,1,2-Tetrachloro-2,2-difluoroethane	500	4170

76120		1,1,2,2-Tetrachloro-1,2-difluoroethane; fluorocarbon 112	500	4,170
79345	S	1,1,2,2-Tetrachloroethane; acetylene tetrachloride	1	7
127184		Tetrachloroethylene; see Perchloroethylene
56235		Tetrachloromethane; see Carbon tetrachloride
1335882	S	Tetrachloronaphthalene	--	2
3689245		Tetraethyl dithionopyrophosphate; see Sulfotep

78002	S	Tetraethyl lead; tetraethylplumbane, as Pb	--	0.075
107493		Tetraethyl pyrophosphate; see TEPP
109999		Tetrahydrofuran	200	590		250	735
75741	S	Tetramethyl lead; tetramethylplumbane, as Pb	--	0.075
115775		Tetramethylolmethane; see Pentaerythritol
3333526	S	Tetramethyl succinonitrile (decomposition product of 2,2′-azobisisobutyronitrile)	0.5	3

137268		Tetramethyl thiuram disulfide, see Thiram
509148		Tetranitromethane	0.005	0.04
7722885		Tetrasodium pyrophosphate	--	5
479458	S	Tetryl; 2,4,6-trinitrophenylmethylnitramine	--	1.5

	S	Thallium, soluble compounds, as Tl	--	0.1
109999		THF; see Tetrahydrofuran
96695		4,4′-Thiobis(6-tert-butyl-m-cresol	--
		Total dust	--	10
		Respirable fraction⁽ⁿ⁾	--	5

68111	S	Thioglycolic acid	1	3.8
7719097		Thionyl chloride	1	5	C
137268		Thiram; bis(dimethylthiocarbamoyl) disulfide	--	5

	S	Tin, organic compounds, as Sn	--	0.1		--	0.2
21651194		Tin, tin oxide and inorganic compounds, except SnH_$4, as Sn	--	2
13463677		Titanium dioxide, as Ti; see Particulates not otherwise regulated

137268		TMTD; see Thiram
118967		TNT; see 2,4,6-Trinitrotoluene
108883	S	Toluene; toluol	10	37	500 ppm	150	560
584849		Toluene-2,4-diisocyanate; TDI	0.005	0.04	0.02 ppm	0.02	0.15

108441	S	m-Toluidine	2	9
95534	S	o-Toluidine; o-methylaniline	2	9
106490	S	p-Toluidine	2	9
8001352		Toxaphene; see Chlorinated camphene
115866		Tpp; see Triphenyl phosphate

		Tremolite, nonasbestiform; see Silicates
75252		Tribromomethane; see Bromoform
126738		Tributyl phosphate	0.2	2.5

76039		Trichloroacetic acid	1	5
120821		1,2,4-Trichlorobenzene	5	40	C
50293		1,1,1,-Trichloro-2,2-bis(p-chlorophenyl)ethane; see DDT
71556		1,1,1-Trichloroethane; see Methyl chloroform
79005	S	1,1,2-Trichloroethane	10	45
79016		Trichloroethylene; trichloro-ethene	25	135	300 ppm	100	537
75694		Trichlorofluoromethane; Fluorocarbon 11	1,000	5,600	C
67663		Trichloromethane; see Chloroform

594423		Trichloromethanethiol; see Perchloromethyl mercaptan
1321659	S	Trichloronaphthalene	--	5
76062		Trichloronitromethane; see Chloropicrin

93765		2,4,5-Trichlorophenoxyacetic acid see 2,4,5-T
96184		1,2,3-Trichloropropane	10	60
76131		1,1,2-Trichloro-1,2,2-trifluoroethane	1000	7600	2000 ppm	1250	9500

78308		Tricresyl phosphate; see Triorthocresyl phosphate
13121705		Tricyclohexyltin hydroxide; see Cyhexatin
102716		Triethanolamine	--	5
121448	S	Triethylamine	1	4.1	C
112492	S	Triethylene glycol dimethyl ether, Triglyme	5	36

75638		Trifluorobromomethane	1,000	6,100
2451629		1,3,5-Triglycidyl-s-triazinetrione		0.005
552307		Trimellitic anhydride	0.005	0.04	C
75503		Trimethylamine	5	12		15	36
		Trimethylbenzene, all isomers	25	125
121459		Trimethyl phosphite	2	10
88891		2,4,6-Trinitrophenol; see Picric acid
479458		2,4,6-Trinitrophenylmethyl nitramine; see Tetryl
118967	S	2,4,6-Trinitrotoluene; TNT	--	0.5
78308	S	Triorthocresyl phosphate	--	0.1

603349		Triphenylamine	--	5
115866	S	Triphenyl phosphate; TPP	--	3
7440337		Tungsten metal, as W	--	5
		Tungsten, insoluble compounds, as W	--	5		--	10
		Tungsten, soluble compounds, as W	--	1		--	3
8006642		Turpentine	100	560

		Uranium (natural), insoluble compounds, as U	--	0.2		--	0.6
		Uranium (natural), soluble compounds, as U	--	0.05

110623		Valeraldehyde	50	175
1314621		Vanadium pentoxide (V_$2O_$5), respirable dust and fume	--	0.05
75014	S	VC; see Vinyl chloride, Section 5210

		Vegetable oil mists (except castor, cashew nut or similar irritant oils); see Particulates not otherwise regulated
108054		Vinyl acetate	10	30		15	45
100425		Vinylbenzene; see Styrene
593602		Vinyl bromide; bromoethylene	0.1	0.44
75014	S	Vinyl chloride, see Section 5210	1
107131	S	Vinyl cyanide, see Acrylonitrile, Section 5213
100403	S	4-Vinyl cyclohexene	0.1	0.4
106876	S	Vinyl cyclohexene dioxide	0.1	0.57
75025		Vinyl fluoride	0.2	0.38
75354		Vinylidene chloride; 1,1-dichloroethylene	1	4
75387		Vinylidene fluoride	100	262
25013154		Vinyltoluene	50	240
8030306		VM & P (Varnish Makers and Painters) Naphtha	300	1,350		400	1800

81812		Warfarin; 3-(alpha-acetonyl-benzyl)-4-hydroxycoumarin	--	0.1
		Welding fumes; total particulates (see also individual constituents)	--	5

		Wood dust	--
		All soft and hard woods, except Western red cedar	--	2		--	5
		Wood dust, Western red cedar	--	0.5

1330207		Xylene; xylol; dimethylbenzene	100	435	300 ppm	150	655
1477550	S	m-Xylene-a,a′-diamine	--	0.1	C
1300738	S	Xylidine; aminodimethylbenzene	0.5	2.5

		Yttrium compounds, as Y	--	1
7646857		Zinc chloride fume	--	1		--	2
13530659		Zinc chromate, as Cr	--	0.005
		(see also Sections 1532.2, 5206 & 8359)
15930946		Zinc chromate hydroxide, as Cr	--	0.005
		(see also Sections 1532.2, 5206 & 8359)
1314132		Zinc oxide fume	--	5		--	10
		Zinc oxide dust, see Particulates not otherwise regulated
11103869		Zinc potassium chromate, as Cr	--	0.005
		(see also Sections 1532.2, 5206 & 8359)
557051		Zinc stearate	--	10
37300235		Zinc yellow, as Cr	--	0.005
		(see also Sections 1532.2, 5206 & 8359)
		Zirconium compounds, as Zr	--	5		--	10

Footnotes (a) through (u) at end of Table AC-1.

__________

Footnotes to Table AC-1

(a) The Chemical Abstracts Service Registry Number is a designation used to identify a specific compound or substance regardless of the naming system; these numbers were obtained from the Desk Top Analysis Tool for the Common Data Base and from the Chemical Abstracts Indexes.

(b) Refer to section 5155(d) for the significance of the Skin notation.

Trade Name	Chemical/Generic Name
Abate	see Temephos
Ammate	see Ammonium Sulfamate
Aqualin	see Acrolein
Arasan	see Thiram
Azodrin	see Moncrotophos
Baygon	see Propoxur
Bidrin	see Dicrotophos
Butyl Cellosolve	see 2-Butoxyethanol
Cellosolve	see 2-Ethoxyethanol
Cellosolve Acetate	see 2-Ethoxyethyl acetate
Compound 1080	see Sodium Fluoracetate
Coyden	see Clopidol
Crag Herbicide	see Sesone
Cythion	see Malathion
Dasanit	see Fensulfothion
Delnav	see Dioxathion
Dibrom	see Naled
Difolatan	see Captafol
Disyston	see Disulfoton
Dowtherm A	see Phenylether and Biphenyl
Dursban	see Chloropyrifos
Dyfonate	see Fonofos
Fermate	see Ferbam
Freons	see Fluorocarbons
Furadan	see Carbofuran
Guthion	see Azinphos Methyl
Korlan	see Ronnel
Lannate	see Methomyl
Mariate	see Methoxychlor
MLT	see Malathion
Moxie	see Methoxychlor
Nialate	see Ethion
Nankor	see Ronnel
Phosdrin	see Mevinphos
Pival	see Pindone
Plictran	see Cyhexatin
Santobrite	see Pentachlorophenol
Sevin	see Carbaryl
Systox	see Demeton
Teflon	see Polytetrafluoroethylene
Thimet	see Phorate
Thiodan	see Endosulfan
Tordon	see Picloram
Trolene	see Ronnel
Vapona	see Dichlorvos
Weedone 638	see 2, 4-D
Zoalene	see Dinitolmide

(d) For the definition and the application of the Permissible Exposure Limit (PEL), refer to section 5155(b) and (c)(1).

(e) Parts of gas or vapor per million parts of air by volume at 25oC and 760mm Hg pressure.

(f) Milligrams of substance per cubic meter of air at 25oC and 760mm Hg pressure.

(g) Refer to section 5155(b) and (c)(3) for the significance of the Ceiling notation. A “C” notation in this column means the values given in the PEL columns are ceiling values. A numerical entry in this column represents a ceiling value in addition to the TWA values.

(h) A number of gases and vapors, when present in high concentrations, act primarily as asphyxiants without other adverse effects. A concentration limit is not included for each material because the limiting factor is the available oxygen. (Several of these materials present fire or explosion hazards.)

(i) Coal tar pitch volatiles (benzene or cyclohexane-soluble fraction) include fused polycyclic hydrocarbons (some of which are known carcinogens) which volatilize from the distillation residues of coal, petroleum (excluding asphalt), wood, and other organic matter. Asphalt (CAS 8052-42-4, and CAS 64742-93-4) is not covered under the “coal tar pitch volatiles” standard.

(j) This standard applies to the cotton waste processing operations of waste recycling (sorting, blending, cleaning, and willowing) and garnetting. It does not apply to cotton gins, cottonseed oil industry, or operations covered by section 5190.

(k) A PEL of 0.05 ppm shall apply to exposures involving a mixture of ethylene glycol dinitrate and nitroglycerin.

(l) As sampled by method that does not collect vapor.

(m) Thermal decomposition of the fluorocarbon chain in air leads to the formation of oxidized products containing carbon, fluorine and oxygen. An index of exposure to these products is possible through their alkaline hydrolysis followed by a quantitative determination of fluoride content. No particular concentration limit is specified pending evaluation of the toxicity of the products but concentrations should be kept below the sensitivity of the analytical method.

(n) The concentration and percentage of the particulate used for this limit are determined from the fraction passing a size selector with the following characteristics:

Aerodynamic Diameter in Micrometers (unit density sphere)

Percent Passing Selector

	0			100
	1			97
	2			91
	3			74
	4			50
	5			30
	6			17
	7			9
	8			5
	10			1

(o) Refer to sections 5155(b) and (c)(2) for the definition and application of the Short Term Exposure Limit (STEL).

(p) (Reserved)

(q) Fibers per cubic centimeter of air at 25oC and 760mm Hg pressure. To be considered a fiber for this limit, the particle must be longer than 5μm, have a length to diameter ratio of three or more, and have a diameter less than 3μm. The National Institute for Occupational Safety and Health (NIOSH), Method 7400, Issue 2, August 15, 1994, which is hereby incorporated by reference, shall be used for measuring airborne fiber concentrations.

(r) Compliance with the subtilisins PEL is assessed by sampling with a high volume sampler (600-800 liters per minute) for at least 60 minutes.

(s) The concentration and percentage of the particulate used for this limit are determined from the fraction passing a size selector with the following characteristics:

Aerodynamic Diameter in Micrometers (unit density sphere)

Percent Passing Selector

	0	100
	1	97
	2	94
	5	87
	10	77
	20	65
	30	58
	40	54.5
	50	52.2
	100	50

(t) Glutaraldehyde can cause occupational asthma and skin sensitization responses such as contact dermatitis. Exposure related symptoms may include one or more of the following: shortness of breath, chest tightness, wheeze, cough, skin rash, hives, and irritation of the nose, throat, skin or eye. Hazard communication training required by sections 5191 or 5194 shall address these health hazards and symptoms along with the measures taken by the employer to evaluate and control exposures that can include medical evaluations, exposure monitoring, ventilation systems, work practices, and personal protective equipment. The communication system required by section 3203 shall inform employees where to report possible health symptoms and where to ask questions, report concerns, and receive information about the employer's evaluation and control measures.

(u) This PEL applies to the sum of the exposures to the substance in the vapor state and from the particulate fraction specified in footnote (s) in this table.

Credits

Note: Authority cited: Section 142.3, Labor Code. Reference: Sections 142.3 and 144.6, Labor Code.

History

1. Editorial correction of printing errors (Register 84, No. 4). For prior history, see Register 83, No. 45.

2. Amendment of Table AC-1 filed 3-8-84; effective thirtieth day thereafter (Register 84, No. 10).

3. Amendment of Tables AC-2 and AC-3 filed 8-30-84; effective thirtieth day thereafter (Register 84, No. 35).

4. Amendment of Table AC-2 filed 9-26-84; effective thirtieth day thereafter (Register 84, No. 39).

5. Amendment of Table AC-3 filed 12-13-84; effective thirtieth day thereafter (Register 84, No. 50).

6. Amendment of Table AC-1 filed 1-16-85; effective thirtieth day thereafter (Register 85, No. 3).

7. Editorial correction of printing error of mppcf designation for Talc (fibrous, nonfibrous and mixtures) in Table AC-3 (Register 85, No. 12).

8. Amendment of Table AC-1 and footnote (j) filed 11-21-86; effective thirtieth day thereafter (Register 86, No.47).

9. Amendment of subsection (c), (d), (f), Tables AC-1, AC-2 and AC-3 filed 2-3-87; effective thirtieth day thereafter (Register 87, No. 6).

10. Amendment filed 7-26-90; operative 8-25-90 (Register 91, No. 1).

11. Amendment of Table AC-1 and footnotes to Table AC-1 filed 11-21-90; operative 12-21-90 (Register 91, No. 1).

12. Editorial correction of graphic correcting spelling of Beryllium and adding measurements omitted (Register 91, No. 23).

13. Amendment of Table AC-1 and Note filed 4-7-92; operative 5-7-92 (Register 92, No. 14).

14. Editorial correction of printing error repositioning Grain dust (Register 92, No. 34).

15. Amendment of Table AC-1 filed 3-3-93; operative 4-2-93 (Register 93, No. 11).

16. Amendment of Table AC-1 filed 4-30-93; operative 5-31-93 (Register 93, No. 18).

17. Change without regulatory effect amending Table AC-1 Formaldehyde filed 12-7-94 pursuant to section 100, title 1, California Code of Regulations (Register 94, No. 49).

18. Amendment of subsections (a)(2) and (c)(2)(B) and Table AC-1 filed 4-3-95; operative 5-3-95 (Register 95, No. 14).

19. Editorial corrections (Register 95, No. 24).

20. Change without regulatory effect amending Table AC-1 filed 6-12-95 pursuant to section 100, title 1, California Code of Regulations (Register 95, No. 24).

21. Change without regulatory effect amending Table AC-1 filed 6-29-95 pursuant to section 100, title 1, California Code of Regulations (Register 95, No. 26).

22. Editorial correction repositioning “Particulates not otherwise regulated” (Register 95, No. 35).

23. Amendment of Table AC-1 (1,3 Butadiene) filed 5-29-97; operative 8-27-97 (Register 97, No. 22).

24. Amendment of Table AC-1 (methylene chloride) filed 8-4-97; operative 11-2-97 (Register 97, No. 32).

25. Change without regulatory effect amending Table AC-1 (silver) filed 1-6-98 pursuant to section 100, title 1, California Code of Regulations (Register 98, No. 2).

26. Change without regulatory effect amending table AC-1 filed 2-16-2000 pursuant to section 100, title 1, California Code of Regulations (Register 2000, No. 7).

27. Change without regulatory effect repealing Appendix footnote (q) filed 6-27-2000 pursuant to section 100, title 1, California Code of Regulations (Register 2000, No. 26).

28. Editorial correction of placement of appendix footnote (h) reference (Register 2000, No. 51).

29. Change without regulatory effect amending subsection (c)(1)(B) and amending appendix filed 12-21-2000 pursuant to section 100, title 1, California Code of Regulations (Register 2000, No. 51).

30. Amendment of Table AC-1 filed 1-4-2001; operative 2-3-2001 (Register 2001, No. 1).

31. Editorial correction of Table AC-1, entries for styrene, sulfometuron methyl and 4-vinyl cyclohexene (Register 2001, No. 24).

32. Change without regulatory effect amending Table AC-1 entry for dicyclohexylmethane-4,4′-diisocyanate filed 7-19-2001 pursuant to section 100, title 1, California Code of Regulations (Register 2001, No. 29).

33. Editorial correction of Table AC-1, entries for aluminum alkyls, 4,4′-diaminobiphenyl, 2,6-Di-tert-butyl-p-cresol, rubber solvent, TEPP and tetramethyl thiuram disulfide (Register 2001, No. 49).

34. Change without regulatory effect amending appendix and Table AC-1 filed 1-17-2002 pursuant to section 100, title 1, California Code of Regulations (Register 2002, No. 3).

35. Amendment of Table AC-1 filed 10-1-2004; operative 10-31-2004 (Register 2004, No. 40).

36. Amendment of Table AC-1, including new footnote (s), filed 10-4-2004; operative 11-3-2004 (Register 2004, No. 41).

37. Amendment of Table AC-1, including new footnotes (t) and (u), filed 6-6-2006; operative 7-6-2006. (The ceiling limit of 0.05 ppm for Glutaraldehyde will take effect 7-6-2008) (Register 2006, No. 23).

38. Editorial correction of Table AC-1, Beryllium and Methyl 2-cyanoacrylate (Register 2006, No. 29).

39. Amendment of subsection (a)(2) and amendment of Table AC-1 filed 9-19-2006; operative 9-19-2006. Submitted to OAL for printing only pursuant to Labor Code section 142.3(a)(3) (Register 2006, No. 38).

40. Editorial correction of Table AC-1--Methyl chloride (Register 2007, No. 32).

41. Change without regulatory effect repealing Table AC-1 footnote u filed 9-23-2008 pursuant to section 100, title 1, California Code of Regulations (Register 2008, No. 39).

42. Editorial correction of Table AC-1, footnote (k) (Register 2009, No. 21).

43. Amendment of Table AC-1 and footnotes (n) and (q) and new footnote (u) filed 2-3-2010; operative 8-3-2010 (Register 2010, No. 6).

44. Change without regulatory effect amending Table AC-1 filed 5-31-2011 pursuant to section 100, title 1, California Code of Regulations (Register 2011, No. 22).

45. Change without regulatory effect amending Table AC-1, footnote (n) filed 1-24-2012 pursuant to section 100, title 1, California Code of Regulations (Register 2012, No. 4).

46. Amendment of Table AC-1 filed 2-16-2012; operative 3-17-2012 (Register 2012, No. 7).

47. Editorial correction of Table AC-1 (Register 2012, No. 37).

48. Amendment of Table AC-1, entry for ethylbenzene, filed 8-27-2013; operative 10-1-2013 (Register 2013, No. 35).

49. Editorial correction of Table AC-1 entry for 1,2-Dibromoethane (Register 2013, No. 50).

50. Amendment of Table AC-1 adding new entry for N-Methylpyrrolidone filed 1-7-2014; operative 4-1-2014 (Register 2014, No. 2).

51. Amendment of Table AC-1 entry for naphthalene filed 6-24-2014; operative 10-1-2014 (Register 2014, No. 26).

52. Amendment of Table AC-1 entry for hydrogen chloride filed 11-26-2014; operative 1-1-2015 (Register 2014, No. 48).

53. Amendment of Table AC-1 filed 10-17-2016; operative 10-17-2016. Submitted to OAL for filing and printing only pursuant to Labor Code section 142.3(a)(3) (Register 2016, No. 43).

54. Editorial correction of Table AC-1 (Register 2017, No. 12).

55. Amendment of Table AC-1 (entries for Wood dust and Wood dust, Western red cedar) filed 4-4-2017; operative 7-1-2017 (Register 2017, No. 14).

56. Amendment of Table AC-1 (entry for beryllium) filed 10-2-2017; operative 10-2-2017 pursuant to Labor Code section 142.3. Submitted to OAL for filing and printing only pursuant to Labor Code section 142.3(a)(4) (Register 2017, No. 40).

57. Amendment of Table AC-1 (entry for benzyl chloride) filed 12-5-2017; operative 4-1-2018 (Register 2017, No. 49).

58. Editorial correction of Table AC-1 (glycol monomethyl ether) (Register 2023, No. 29).

59. Amendment of subsection (a)(1) -- Table AC-1 filed 4-8-2024; operative 1-1-2025 pursuant to Government Code section 11343.4(b)(2) (Register 2024, No. 15).

Appendix to section 5155

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