The EPA measures regional air quality index (AQI) by how hazardous it is to the general public. Discover the AQI in your city by searching below.

Air quality in Western Pennsylvania dropped ... AirNow.gov predicted that Pittsburgh’s AQI would reach 130 on Thursday and 100 on Friday. The Pittsburgh region was forecast to see code orange ...

Tens of thousands of people have evacuated their homes and at least two have died in raging fires sweeping across Los Angeles County Wednesday. Multiple wildfires spread by strong Santa Ana winds ...