Scientific analysis reveals that the colors were derived from ocher and other iron oxides ground into a fine powder.

科学分析表明，这些颜色是源自赭石和其他铁氧化物磨成的细粉。

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Other filters and chemical "scrubbers" catch oxides of sulphur and nitrogen that would otherwise cause acid rain.

其他的过滤器以及化学“捕捉器”负责处理能够引起酸雨的硫氧化物和氮氧化物。

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Black carbon is not emitted alone, but mixed with other things-organic molecules and various oxides of sulphur and nitrogen.

黑碳并不是单独被排放的，它被排放的同时还混合了许多别的物质——比如，有机分子还有各种各样的硫氧化物和氮氧化物。

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Rust is the metal (Fe for iron) turning to the oxide (Fe2O3 normally for iron although there are other oxides).

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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).

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Automakers already strip lots of other pollutants from cars, such as the nitrogen oxides that contribute to smog, and carbon monoxide, which is poisonous.

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