本文对摩托车排气污染物的形成、影响因素进行了分析，并指出了机内与机外净化措施。

This paper analyses the forming and effects of motorcycle. exhaust emissions, and points out the purifying approach of both in-engine and out-engine parts.

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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.

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