As humans continue to pump more gases into the atmosphere, you've probably seen air quality alerts more often, but what does ...

After a windy and dusty Friday in parts of the Coachella Valley, the air quality is expected to improve by Saturday morning as winds subside.

A hidden air pollutant is discovered by Caltech scientists that may change the way smog is studied in Southern California ...

Air quality is defined as the degree to which the air of a set place is pollutant-free. In the United States, air quality is ...

Ozone is a gas comprised of three oxygen (O3) atoms. It is unstable and reacts easily to other gases. In its natural state, it is a component in several levels of the atmosphere. At high altitudes ...

But that doesn’t tell the whole story. That’s because the air quality index, or AQI, provides an average over longer periods of time — eight hours for ground-level ozone and 24 hours for ...