Ozone is one of the most harmful air pollutants.

臭氧是最具危害性的空气污染。

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The Clean Air Act mandates the EPA to regulate harmful pollutants such as particulate matter and ozone.

《清洁空气法》授权美国环保局监管有害污染物，如微粒物质和臭氧。

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And can lead to air pollutants is not easy to spread, enhanced the toxicity of harmful substances, serious, may also cause smog.

并且会导致空气中污染物不易扩散，增强有害物质的毒性，严重的，还可能会导致毒雾发生。

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And that in turn leads to additional emissions of harmful pollutants and our area is very concerned about improving air quality as one of the key ways to make our communities even better places to live and work."

VOA: standard.2010.07.26

Harmful air pollutants in the United States, he adds, have fallen by 70 percent in the last two decades.

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The harmful pollutants released into the air by coal-fired electricity generation, such as sulphur, also dampen the greenhouse effect.

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