Abstract

Introduction Heat Stress is an occupational hazard expected to increase in severity and breadth with climate change. Workers exposed to heat and hot environments can have increased injuries, exacerbation of disease, reduced productivity, and heat illness resulting in death. Strategies to respond are mitigation policies and preparedness. The National Institute of Occupational Safety and Health’s (NIOSH) Revised Criteria for a Recommended Standard, Occupational Exposure to Heat and Hot Environments outlines training for and medical surveillance and research of worker populations exposed. Methods Heat illness and worker’s compensation costs before and after the implementation of a Heat Stress Awareness Program (HSAP) were evaluated retrospectively in a cohort of outdoor municipal workers from 2010–2016. The HSAP brought training and medical surveillance to at risk workers as outlined in NIOSH’s Criteria for a Recommended Standard Occupational Exposure to Heat and Hot Environments. Results 526 outdoor workers met inclusion criteria. Prior to implementation of the HSAP the occupational heat illness rate was 3%, this decreased to 1% the first three years of the program and less than 1% the last two years. Workers with heat illness were more likely to be extremely obese (p Discussion Training, determining fitness for duty and regular medical monitoring prior to work in a hot environment may decrease frequency of occupational heat illness and occupational medical care costs in exposed workers. This study supports NIOSH’s Occupational Exposure to Heat and Hot Environments’ promulgation into U.S. law which can provide protection to vulnerable U.S. workers and may provide valuable guidance to the unknown numbers that will be added to the climate-vulnerable population as the global temperature continues to rise.

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