Cook County is under a heat watch through Thursday evening. Temperatures could feel like 105-110 degrees Wednesday.

If you have breathing problems, be sure to take it easy on Wednesday and limit outdoor time. Air quality will be unhealthy ...

Central Ohio counties face an Air Quality Alert as ozone levels rise due to high pressure and sunny conditions.

The 'unhealthy for sensitive groups' air quality in Chicago comes as an air quality alert was issued for the entire state of ...