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。
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。
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。
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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