When air quality is ranked "unhealthy for vulnerable groups" it means PM 2.5 are at levels that can cause problems for people ...

Have you ever noticed the strange, colorful splotches clinging to rocks, tree bark, or even old fences after a rainy day?

The combined effects of climate change and air pollution have led to direct declines in precipitation in the U.S. Southwest, ...

Millions of people in California have been urged to avoid grilling on Wednesday amid concerns over high air pollution levels.