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

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。

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Ozone at ground level - not to be confused with the ozone layer in the upper atmosphere - is one of the major constituents of photochemical smog.

与高层大气臭氧层不同的是，地面的臭氧是光化学烟雾的一个主要组成部分。

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Unlike the protective layer of ozone in the upper atmosphere, excessive ground-level ozone is tied directly to health.

与高空中具有保护能力的臭氧层不同，过量的近地面臭氧直接危害人体健康。

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While the ozone layer in the upper atmosphere plays an important role in limiting harmful ultraviolet light reaching the Earth's surface, low-level ozone is a pollutant that is harmful, causing respiratory problems in animals as well as well-documented cases in humans.

BBC: Invasive plant 'increases ozone pollution'