Scientists have linked a warmer climate to a 70 percent increase in unhealthy summertime ozone levels.
Viewed under an electron microscope, smog can look like snowflakes.
It must sting when the world's biggest smog-hole is calling your air polluted.
It's not a new problem, but the country's struggle with air pollution has finally gone mainstream.
Levels of pollution exposure can vary dramatically within a city.
A school administrator says the workout can detoxify lungs and dispel residue gas.
NASA captures a 750-mile trail of haze on camera.
What pairs best with the Asian brown cloud? Try the "Vogmask."
A lack of wind, corn burning for the harvest, and the onset of central heat fouled up Harbin's air so much that schools and offices had to close.
A Dutch designer's innovative proposal for the pollution-ridden city.
The city is rolling out a series of regulations to cut emissions over the next five years.
And this could go on for several weeks.
Record air pollution levels hit the city-state thanks to forest fires in its neighboring country.
You don't need any statistics to fully grasp the depth of the economic crisis. You only need to know about the smoke.
Air pollution has been particularly bad in China this week, with levels nine times above what the U.S. considers "unsafe."
A team of scientists assigned tones to different air pollutants. Here are the results.
How does England's air quality compare to that of past hosts, and could it affect athletes?
How I'm figuring my way around Beijing
In Los Angeles, at least, the answer is no