In 1997, for instance, the E.P.A. moved to reduce surface ozone, a form of pollution caused, in part, by emissions from oil refineries.
举例来说，1997年，美国环保署意图降低地表臭氧量标准——一种部分由石油精炼排放的污染物造成的污染。
The stratosphere holds an natural amount of ozone, but by Earth's surface this becomes air pollution.
大气平流层中存在有大量的臭氧，它们若是在地球表面则会造成空气污染，空气中的臭氧会严重破坏人的肺部。
It is known that in recent years, industrial pollution has caused the Earth's ozone layer to thin, allowing an increase in the amount of ultraviolet radiation that reaches the Earth's surface.
众所周知，在最近的几年中，工业污染已导致地球的臭氧层变得日益稀薄，致使到达地球表面的紫外线辐射量增加。
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