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.

California air regulators acknowledge that the region ... of air pollution in South Coast that the air district and CARB do not have the regulatory authority to control,” an EPA spokesperson ...

On Wednesday, representatives from Adams and Jefferson counties joined Becker and Michael Ogletree, director of the Air Pollution Control Division ... who leads the EPA’s region that includes ...

The red-level air quality index (AQI) category—covering values from 151 to 200—means the air is unhealthy for everyone, not just vulnerable populations. According to the EPA, "some members of ...