As extreme heat conditions sweep across various regions, multiple cities have opened cooling centers to provide relief to residents. DuPage County, Dayton, Detroit, Lockport, Fort Wayne, Chicago, and Middleton have all activated these centers, with many advising residents to stay indoors and hydrated. The National Weather Service has issued heat advisories and excessive heat warnings, with temperatures expected to reach dangerous levels, posing significant health risks. Authorities emphasize the importance of knowing heat-related symptoms and checking on vulnerable neighbors. Additional measures include splash pads in Dayton and an air pollution alert in Chicago, highlighting the multifaceted approach to combating the heat wave.