10 APPENDIX A: Heat Exposures Tables
ACGIH
Screening Criteria for Heat Stress Exposure. WBGT values in C.
NOTE: according to the ACGIH’s guidelines, the temperature values
represent a work and rest process which is explained in the standards.
Please refer to the ACGIH TLV’s and BEIs for specific details.
Work and
recovery
(TLV )
Light
Moderate
Heavy
Very
Heavy
75% to 100%
31.0
28.0
26.0*
23.5*
50% to 75%
31.0
29.0
27.5
25.5*
25% to 50%
32.0
30.0
29.0
28.0
0% to 25%
32.5
31.5
30.5
30.0
Work and
recovery
(Action Limit)
Light
Moderate
Heavy
Very
Heavy
75% to 100%
28.0
25.0
22.5*
20.0*
50% to 75%
28.5
26.0
24.0
22.5*
25% to 50%
29.5
27.0
25.5
24.5
0% to 25%
30.0
29.0
28.0
27.0
*Values not specified by ACGIH have been estimated for continuity.
Cited from "American Conference of Governmental Industrial Hygienists -
Threshold Limit Values and Biological Exposure Indices for 2008"; Reprinted with
permission from ACGIH
United States Navy
Physiological Heat Exposure Limits (PHEL) Time Table
(Without the presence of fuel combustion gases/fuel vapors) is
displayed on the following page.
The recommended working hours are shown based on a maximum of
eight hours. Naval personnel will follow a category, I - VI, based upon
their function.
Appendix A:
Heat exposure tables