Ahead of the International Day of Clean Air, here’s a look at what causes air pollution, what it does to people and how the world can rein it in.

The majority of agricultural land has air pollution levels above legal limits, threatening crop production. Air pollution exposure kills more than 350,000 people in Europe every year despite ...

This archived news story is available only for your personal, non-commercial use. Information in the story may be outdated or superseded by additional information. Reading or replaying the story in ...

Houston-area residents living near Sam Houston National Forest risk breathing in unhealthy pollution from the 2,000-acre wildfire ripping across the area, even as fire crews work hard to battle the ...