这些分子燃烧起来比汽油更干净，部分原因是它们的碳-碳键更少（如果有的话），而且它们排放的碳氢化合物不太可能产生臭氧。

These molecules burn more cleanly than gasoline, in part because they have fewer, if any, carbon-carbon bonds, and the hydrocarbons they do emit are less likely to generate ozone.

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本文作者采用稀释通道、热重分析仪，测量了S195柴油机微粒排放的质量浓度，对微粒中的碳和碳氢化合物两种组分进行了分析。

The authors measured the mass concentration and chemical components of the particulates exhausted from a S195 diesel engine by using dilution tunnel and thermogravimetric analyzer.

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到1998年，碳氢化合物的释放必须在原来的标准上再下降30%，同时氮氧化物的排放再下降60%。

By 1998, hydrocarbon emissions will have to be cut 30% below the Prior standard, while nitrogen oxides must be cut 60%.

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