OSHA-NIOSH Heat Safety Tool App

Key considerations for using the app
  • Heat index (HI) values were created for shady, light wind conditions, so exposure to full sunshine can increase heat index values by up to 15°F.
  • The simplicity of the HI makes it a good option for many outdoor work environments (as long as there are no additional radiant heat sources, such as, fires or hot machinery). However, if you have the ability, NIOSH recommends using wet bulb globe temperature (WBGT)-based Recommended Exposure Limits (RELs) and Recommended Alert Limits (RALs) in hot environments.
  • Use of the HI or WBGT is important, but other factors such as strenuous physical activity also cause heat stress among workers. Employers should have a robust heat stress prevention program that ensures workers are protected.
  • NIOSH and OSHA are currently considering new scientific data related to the HI levels, and considering how to best incorporate the evolving science. It is important to regularly download updates to ensure you are using the latest version of the app.
IPhone viewed from the front showing the main page of the OSHA NIOSH Heat Safety tool. The display reads "Feels like 112 degrees", and offers an orange button with the work "Precautions"

The OSHA-NIOSH Heat Safety Tool is a useful resource for planning outdoor work activities based on how hot it feels throughout the day. Featuring real-time heat index and hourly forecasts, specific to your location, as well as occupational safety and health recommendations from OSHA and NIOSH.

The OSHA-NIOSH Heat Safety Tool features:

  • A visual indicator of the current heat index and associated risk levels specific to your current geographical location
  • Precautionary recommendations specific to heat index-associated risk levels
  • An interactive, hourly forecast of heat index values, risk level, and recommendations for planning outdoor work activities in advance
  • Editable location, temperature, and humidity controls for calculation of variable conditions
  • Signs and symptoms and first aid information for heat-related illnesses

Get the OSHA NIOSH Heat Index App on the Google Play Storeexternal icon

FAQs

Page last reviewed: June 23, 2021