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So far, though, the first year has seen another increase in air pollution.

Air pollution is an example of just such a problem.

But there are other things, like air pollution, where what one state does makes a difference.

Learn what you can do to help reduce air pollution.

Air pollution has also become a major problem in most cities.

By the early 1980s air pollution had been a dead issue for more than a decade.

The air pollution is so bad that the sun never appears.

But how much air pollution is really due to cars?

The state has by far the nation's worst air pollution problems.

Air pollution is now a critical concern in China, she said.