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 2. Safe Practices and Personal Protection
Article 10. Personal Safety Devices and Safeguards

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Appendix A to Section 3396. National Weather Service Heat Index Chart (2019).

Heat Illness Prevention resources for Employers and Workers
Relative Humidity %
Temperature °F
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
80
77
78
78
79
79
79
80
80
80
81
81
82
82
83
84
84
85
86
86
87
81
78
79
79
79
79
80
80
81
81
82
82
83
84
85
86
86
87
88
90
91
82
79
79
80
80
80
80
81
81
82
83
84
84
85
86
88
89
90
91
93
95
83
79
80
80
81
81
81
82
82
83
84
85
86
87
88
90
91
93
95
97
99
84
80
81
81
81
82
82
83
83
84
85
86
88
89
90
92
94
96
98
100
103
85
81
81
82
82
82
83
84
84
85
86
88
89
91
93
95
97
99
102
104
107
86
81
82
83
83
83
84
85
85
87
88
89
91
93
95
97
100
102
105
108
112
87
82
83
83
84
84
85
86
87
88
89
91
93
95
98
100
103
106
109
113
116
88
83
84
84
85
85
86
87
88
89
91
93
95
98
100
103
106
110
113
117
121
89
84
84
85
85
86
87
88
89
91
93
95
97
100
103
106
110
113
117
122
90
84
85
86
86
87
88
89
91
92
95
97
100
103
106
109
113
117
122
127
91
85
86
87
87
88
89
90
92
94
97
99
102
105
109
113
117
122
126
132
92
86
87
88
88
89
90
92
94
96
99
101
105
108
112
116
121
126
131
93
87
88
89
89
90
92
93
95
98
101
104
107
111
116
120
125
130
136
94
87
89
90
90
91
93
95
97
100
103
106
110
114
119
124
129
135
141
95
88
89
91
91
93
94
96
99
102
105
109
113
118
123
128
134
140
96
89
90
92
93
94
96
98
101
104
108
112
116
121
126
132
138
145
97
90
91
93
94
95
97
100
103
106
110
114
119
125
130
136
143
150
98
91
92
94
95
97
99
102
105
109
113
117
123
128
134
141
148
99
92
93
95
96
98
101
104
107
111
115
120
126
132
138
145
153
100
93
94
96
97
100
102
106
109
114
118
124
129
136
143
150
158
101
93
95
97
99
101
104
108
112
116
121
127
133
140
147
155
102
94
96
98
100
103
106
110
114
119
124
130
137
144
152
160
103
95
97
99
101
104
108
112
116
122
127
134
141
148
157
165
104
96
98
100
103
106
110
114
119
124
131
137
145
153
161
105
97
99
102
104
108
112
116
121
127
134
141
149
157
166
106
98
100
103
106
109
114
119
124
130
137
145
153
162
172
107
99
101
104
107
111
116
121
127
134
141
149
157
167
108
100
102
105
109
113
118
123
130
137
144
153
162
172
109
100
103
107
110
115
120
126
133
140
148
157
167
177
110
101
104
108
112
117
122
129
136
143
152
161
171
111
102
106
109
114
119
125
131
139
147
156
166
176
112
104
107
111
115
121
127
134
142
150
160
170
181
113
104
108
112
117
123
129
137
145
154
164
175
114
105
109
113
119
125
132
140
148
158
168
179
115
106
110
115
121
127
134
143
152
162
173
184
116
107
111
116
122
129
137
146
155
166
177
117
108
112
118
124
132
140
149
159
170
181
118
108
113
119
126
134
142
152
162
174
186
119
109
114
121
128
136
145
155
166
178
120
110
116
122
130
138
148
158
170
182
121
111
117
124
132
141
151
162
174
187
122
111
118
125
134
143
154
165
178
123
112
119
127
136
146
157
169
182
124
113
120
129
138
148
160
172
125
114
121
130
140
151
163
176

Credits

Note: Authority cited: Section 142.3, Labor Code. Reference: Sections 142.3, 144.6 and 6720, Labor Code.
History
1. New appendix A filed 7-23-2024; operative 7-23-2024 pursuant to Government Code section 11343.4(b)(3) (Register 2024, No. 30).


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