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。
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.
光化学烟雾在世界各地的许多大城市里都有。
Photochemical smog is found in many large cities all over the world.
文章分析了光化学烟雾形成的原因，讨论了其形式的机理以及造成的危害，同时提出了防治光化学烟雾的一些对策。
The reasons of the formation of Photochemical Smoke is analyzed, its production harms brought about, meanwhile, came up with some countermeasures of preventing photochemical smoke is discussed.
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