"OSHA is pleased to announce the release of the OSHA-NIOSH Heat Safety Tool. The new app, available for both Android and iPhone, is a collaborative effort between OSHA and NIOSH to update the OSHA Heat Safety Tool. Since launching in 2011, more than 450,000 users downloaded the OSHA Heat Safety Tool. With the release of the co-branded version, which provides a new and refreshed interface, both agencies expect to reach even more users. Anyone using the current OSHA Heat Safety Tool is encouraged to download the new OSHA-NIOSH Heat Safety Tool. The OSHA Heat Safety Tool will no longer be available for download after September 30, 2017.
For more information, see the NIOSH Science Blog post: Heat Index: When humidity makes it feel hotter."