Criteria for a Recommended Standard: Occupational Exposure to Heat and Hot Environments

Occupational exposure to heat can result in injuries, disease, reduced productivity, and death. To address this hazard, the National Institute for Occupational Safety and Health evaluated the scientific data on heat stress and hot environments and updated these criteria (last updated in 1986). This revision includes information about physiological changes that result from heat stress; evidence to redefine heat stroke and associated symptoms; and updated information on physiological monitoring and personal protective equipment and clothing that can be used to control heat stress.