To reduce air pollution, the government needs to impose a ceiling on carbon emissions.

为减少空气污染，政府需要设定碳排放上限。

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Even as a growing number of coal-burning power plants around the nation have moved to reduce their air emissions, many of them are creating another problem: water pollution.

即使全国各地的火力发电厂已经开始行动减少空气污染物的排放，但是却带来另一个问题——水质污染。

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If we could go one step further and reduce air pollution in affected communities by cutting emissions from cars, trucks and dirty industries, the impact would be even greater.

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In the United States, national ambient air quality standards have led to efforts to reduce human emissions that cause pollution.

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"How to reduce the emissions from pollution sources is of paramount importance for improving our ever deteriorating air quality, " he says.

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