Despite decades of progress in reducing air pollution, Los Angeles is still the nation's smoggiest city, according to a report released on April 23 by the American Lung Assn. A new study has revealed ...

A summertime weather pattern has moved into the New York Area, bringing potentially record-high temperatures.

Surface ozone in China has risen steadily over the past decade, posing challenges to public health, agriculture and ecosystems. Ozone forms through photochemical reactions involving nitrogen oxides ...

Denver's topography, polluters and proximity to wildfires present a unique combination of air quality challenges.