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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

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§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.
(c) Exposure Limits.
(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+ ... CnTn
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
TWAn
D =
 
+
 
+ ...
 
PEL1
PEL2
PELn
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/M3(f)
Ceiling(g)
ppm(e)
mg/M3(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
--
0.020
as Cr
--
0.005
(see also Sections 5198, 1532.1, 1532.2, 5206 & 8359) Lead (metallic) and inorganic compounds, dust and fume, as Pb (see also Section 5198)
--
0.05
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.
(c) Trade Names Removed from Table AC-1.
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).

Appendix to section 5155



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