他说，“尤其要注意氮氧化物”，因为它们可以破坏臭氧层。

"Nitrogen oxides in particular are of concern," he says, because they can destroy ozone.

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一氧化二氮在地平面时是稳定的，但在高层大气中则分解而形成某种化合物，从而引发化学反应而破坏臭氧层。

Nitrous oxide is stable at ground level but breaks down in the upper atmosphere to form compounds that trigger chemical reactions that destroy ozone.

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许多有害的或者有争议的污染物也未计算在内——比如说二氧化碳和小颗粒排放，或者其污染数据未公之于众——比如说臭氧层的破坏程度。

Many harmful or controversial forms of pollution are either not measured - as is the case for carbon dioxide and small particle emissions - or the data is not made public, as is the case for ozone.

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