To support the effort to reduce heat-related illnesses, the Occupational Safety and Health Administration (OSHA) recently announced the launch of its Heat Safety Tool mobile app that can help workers and supervisors monitor heat exposure. The app, available in English or Spanish, calculates a heat index for a work site and provides appropriate reminders for protecting against heat-related illnesses. Detailed recommendations for preventing heat-related illnesses at various risk levels (low, moderate, high, very high) can also be found on the OSHA website.