Using new technology, clean coal plants sharply reduced the number of sooty particles spewed into the air, as well as gases like sulfur dioxide and nitrous oxide.

使用新技术，清洁煤电厂大大减少了煤烟粒子散发到大气中的数量，以及像二氧化硫和一氧化氮等气体。

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Run-off from animal manure also fouls watercourses, and the release of nitrous oxides from uncovered dung heaps pollutes the air.

动物粪便的流出物还污染了水道，未遮盖的粪堆释放出的氧化亚氮（ N2O） ，还会污染空气。

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Destaillats's team reckon that NNK is produced when nicotine from tobacco smoke reacts with nitrous acid in the air.

Hugo Destaillates的团队猜想，亚硝胺(NNK)是烟草中的尼古丁和空气中的亚硝酸反应生成的。

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This will allow truckers to reduce emissions significantly (diesel emissions include nitrous oxides, particulate matter, and other air toxics and they are a major source of pollution in some areas).

FORBES: Acceleration of the Natural Gas Highway

Cheap gas and environmental legislation under the Clean Air Act, aimed at emissions of sulphur dioxide, nitrous oxide and mercury (but not carbon dioxide) from dirty coal plants, accelerated a trend that is set to continue.

ECONOMIST: America��s bounty: Gas works | The