National average concentrations of lead in the air have fallen 93% since 1980, largely because of the phaseout of lead in gasoline, the EPA says.
自1980起，美国空气中铅平均浓度已下降了93%，主要缘于逐步停止在汽油中加入铅，环保署称。
The U. S. phaseout of lead in gasoline was completed in 1996; similar bans are being implemented worldwide.
1996年美国完成了含铅汽油的逐步淘汰，世界各地也正在实施类似的禁令。
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