Heat and Health Index (HHI)

The Heat and Health Index (HHI) helps identify communities where people are most likely to feel the effects of heat on their health, in order to build towards a healthier and more heat-resilient future for all. The Heat and Health Index (HHI) is a national tool that incorporates historical temperature, heat-related illness, and community characteristics data at the ZIP code level to identify areas most likely to experience negative health outcomes from heat and help communities prepare for heat in a changing climate. Each ZIP code has a single ranking for the overall HHI and rankings for individual components so that users can make informed decisions to prepare for and prevent the negative health impacts from heat in their communities.