Heat is the leading cause of death among all hazardous weather conditions in the United States. Excessive heat in the workplace can cause a number of adverse health effects, including heat stroke and even death, if not treated properly. According to the Bureau of Labor Statistics, 479 workers in the U.S. died from exposure to environmental heat from 2011-2022, an average of 40 fatalities per year in that time period. Additionally, there were 33,890 estimated work-related heat injuries and illnesses that resulted in days away from work from 2011-2020, an average of 3,389 per year in that time period. However, these statistics for occupational heat-related illnesses, injuries, and fatalities are likely vast underestimates.

Workers in outdoor and indoor work settings without adequate climate controls are at risk of hazardous heat exposure. Certain heat-generating processes, machinery, and equipment (e.g., hot tar ovens, furnaces, etc.) can also cause hazardous heat when cooling measures are not in place. Some groups may be more likely to experience adverse health effects from heat, such as pregnant workers, while others are disproportionately exposed to hazardous levels of heat, such as workers of color in essential jobs who are more often employed in work settings with high risk of hazardous heat exposure.

Current Status

An informal public hearing on OSHA’s Heat Injury and Illness Prevention in Outdoor and Indoor Work Settings proposed rule is scheduled to be held virtually and begin on June 16, 2025. The period to submit a Notice of Intention to Appear (NOITA) closed on May 2, 2025. Further information and instructions for viewing the hearing will be posted in the coming weeks.

On August 30, 2024, OSHA published in the Federal Register a Notice of Proposed Rulemaking (NPRM) for Heat Injury and Illness Prevention in Outdoor and Indoor Work Settings. This is a significant step toward a federal heat standard to protect workers. The proposed standard would apply to all employers conducting outdoor and indoor work in all general industry, construction, maritime, and agriculture sectors where OSHA has jurisdiction. The standard would require employers to create a plan to evaluate and control heat hazards in their workplace. It would clarify employer obligations and the steps necessary to effectively protect employees from hazardous heat. The ultimate goal is to prevent and reduce the number of occupational injuries, illnesses, and fatalities caused by exposure to hazardous heat.

The NPRM is available on the Federal Register web page at https://federalregister.gov/d/2024-14824 and at www.regulations.gov, which is the Federal e-Rulemaking Portal. The public comment period for the NPRM closed on January 14, 2025.

For more information on this stage of the rulemaking process, visit https://www.osha.gov/laws-regs/rulemakingprocess#v-nav-tab2.

About the Proposed Rule

• Public Hearing News Release
• Federal Register Notice: Extension of comment period and notice of informal hearing
• Notice of Proposed Rulemaking (NPRM)
• Heat Rulemaking Docket
• Document IDs for Heat NPRM References
• Heat NPRM Fact Sheet [Español]
• Compilation of Requests for Comment
• Recorded OSHA Presentation on the NPRM [Español]
• OSHA Presentation Slides on the NPRM [Español]

Background

• Previous Actions
• Heat Injury and Illness SBREFA
• Heat Injury and Illness Prevention in Outdoor and Indoor Work Settings on the Unified Regulatory Agenda (Spring 2021)

Resources

• OSHA's Heat Safety and Health Topics Page
• OSHA's Heat Illness Prevention Campaign
• Heat Injury and Illness Prevention Work Group of the National Advisory Committee on Occupational Safety and Health