The birds have been outfitted with lightweight, GPS-enabled air monitors.
As environmental concerns grow, cities around the world fight to keep their air clean. Which cities are the world's greenest?
Beijing's smog has been in the news. But which are America's most polluted cities? Continue reading →
Choking smog has reached more than 25 times the level considered safe.
Nobody walks in Los Angeles, and that means lots of cars, lots of exhaust, and a big smoggy sky. Where does L.A. rank among the globe's smog centers?
Fireworks are a beloved tradition of the Fourth of July, but the colorful displays also bring a spike in air pollution, a new study shows. Continue reading →
A recent documentary, "Under the Dome," depicts Chinese residents coping with worsening air quality. Just how bad is pollution in China?
Paris in the spring is lovely -- except when you can't breathe. Continue reading →
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