Start with the pollution most cities have, nitrogen oxides and hydrocarbons from tailpipe emissions and smokestack pollutants, mix in the heat and sunlight, and you get ozone.
而制造污染的是汽车尾气和烟囱排出的氮氧化合物和氮氢化合物，它们在高温和阳光下混合，就会产生臭氧。
Smokestack and tailpipe controls, as well as planting trees, can reduce pollution, too.
对烟筒和围棋的控制也可以减少污染，指数造林也可以减少污染。
Smokestack and tailpipe controls, as well as planting trees, can reduce pollution, too.
对烟筒和围棋的控制也可以减少污染，指数造林也可以减少污染。
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