air pollution

Monday's decision from the high court technically only applies to the Clean Air Act's standards on mercury emissions from power plants. But it could affect future EPA regulations, legal experts say.

In polluted Pittsburgh, a new device from a local university helps residents assess indoor air. It's not the only monitor on the market — but is the only one available to borrow from a public library.

Russian gas is expensive, so many Poles still rely on coal. Krakow is one of the most polluted cities in the EU's most polluted country. All that coal is akin to "smoking 2,000 cigarettes per year."

A prominent journalist with a sick child quit her job and produced an eye-opening look at the consequences of China's air pollution problem. Some 200 million have watched it since the weekend.

India's air pollution is so bad that it shortens many people's lives by about three years, a study found. This week Al Gore visited New Delhi to link bad air to climate change.

China has for the first time announced a ceiling to its future carbon emissions. Critics say the commitment is primarily symbolic, and unlikely to have a significant impact in the near future.

About 1.2 million people die prematurely every year in China from exposure to outdoor air pollution. Smog has dogged the country as it grows at an explosive rate and burns huge quantities of fossil fuels. But there are signs that the government is beginning to take the issue more seriously.