. Author manuscript; available in PMC: 2020 Feb 1.

Published in final edited form as: J Occup Environ Med. 2019 Feb;61(2):107–114. doi: 10.1097/JOM.0000000000001484

Table 2.

Recommended Protective Measures by Heat Index

Heat Index	Risk Level	Protective Measures
Less than 33.3°C (91°F)	Lower (Caution)	Basic heat safety and planning
32.8°C to 39.4°C (91°F to 103°F)	Moderate	Implement precautions and heighten awareness
39.4°C to 46.1°C (103°F to 115°F)	High	Additional precautions to protect workers
Greater than 46.1°C (115°F)	Very High to Extreme	Triggers even more aggressive protective measures

This table from the Occupational Safety and Health Administration displays the reccomended protective measures at increasing heat illness risk levels (24).