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.
城市的光化学烟雾引起的大气污染越来越引起人们的关注。
There are increasing concerns on the air pollution caused by photochemical smog in cities.
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