Anyone who grew up near Los Angeles prior to auto emissions regulations knows what bad air looks like. The same is true for many who have grown up in countries that have perennial air quality issues.

The index rates how clean or polluted the air is each day. The EPA uses this measure to keep tabs on five kinds of air pollutants. The main concern from the wildfire smoke is fine particle pollution, ...

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Firefighters work inside a burned structure. After California’s Eaton fire was suppressed in January, invisible gases continued to permeate the air, exposing residents and first responders to ...

SAN JOAQUIN COUNTY – California could be seeing more unhealthy air quality days, not because pollution is getting worse, but because of a new metric to measure air quality by the Environmental ...

NORFOLK, Va. — Air quality can become an issue when wildfires spark across the U.S. and Canada or when densely populated areas use a lot of fossil fuels. Let's talk about how scientists measure air ...