论述了环境空气中铅染的主要来源是机动车排放的尾气，推广使用无铅汽油可明显降低机动车尾气排放对环境空气中铅污染。
The released vehicle exhaust was mainly sources of the lead pollution on the environmental air. The unleaded gasoline may reduce the lead pollution in environmental air of the vehicle exhaust release.
论述了环境空气中铅染的主要来源是机动车排放的尾气，推广使用无铅汽油可明显降低机动车尾气排放对环境空气中铅污染。
The released vehicle exhaust was mainly sources of the lead pollution on the environmental air. The unleaded gasoline may reduce the lead pollution in environmental air of the vehicle exhaust release.
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