This CDC data shows where rates of heat-related illness are highest

The U.S. is seeing high levels of heat-related illness this year, according to data the Centers for Disease Control and Prevention provided to NPR.

The agency has been collecting national data on heat-related illness from emergency departments since 2018 and currently releases it daily through its Heat & Health Tracker.

The data serves as an early-warning system for communities suffering from the heat. “It’s providing real-time health information,” says Claudia Brown, a health scientist with the CDC’s Climate and Health Program.