Electric power plants that burn fossil fuels release hydrocarbons and nitrogen oxides.

通过燃烧矿物发电的火力发电厂会释放碳氢化合物和氮氧化物。

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Electric power plants that burn fossil fuels release hydrocarbons and nitrogen oxides. And when sunlight hits those compounds, ozone forms.

通过燃烧化石燃料提供电能的发电站会开释大量碳氢化合物以及氮氧化物，经阳光照射，就形成了臭氧。

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Start with the pollution most cities have, nitrogen oxides and hydrocarbons from tailpipe emissions and smokestack pollutants, mix in the heat and sunlight, and you get ozone.

而制造污染的是汽车尾气和烟囱排出的氮氧化合物和氮氢化合物，它们在高温和阳光下混合，就会产生臭氧。

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Most experts warn against ozone, which results from the sun heating hydrocarbons and nitrogen oxides in vehicle and industrial emissions.

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The researchers examined the prevailing inspection system called On-Board Diagnostics II (OBD-II), which tests for excessive carbon monoxide, hydrocarbons, and nitrogen oxides, and also checks the power-train systems for problems that might eventually lead to elevated emissions levels.

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