这些污染物常常与其他有害物质，如铅、锌和地面臭氧一起出现。地面臭氧是汽车排气与太阳光一起发生光化学反应形成的一种烟雾成分。
The pollutants often occur with high levels of other toxins such as lead, zinc, and ground-level ozone, a component of smog formed by chemical reactions between car exhausts and sunlight.
机外净化是指在汽车排气管上安装三效催化转化器，使尾气中的有害成分迅速转化为无害物质。
It refers to install the three way catalytic converter at the automobile exhaust pipe, and rapidly transform the harmful ingredients into innoxious substance.
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