Primary standard — an ambient air pollution standard designed to protect human health.

基本标准——一个旨在保护人类健康的周围空气污染级别。

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Many factories were over measure produced the smog that had over the standard and the smog seriously influence the air become air pollution.

许多工厂测量产生的烟雾对标准和烟雾严重影响空气成为空气污染。

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To formulate an adaptable motor vehicle exhaust emission standard is one of the important events of air pollution control according to domestic and foreign experience.

根据国内外经验，制订合适的汽车废气排放标准是控制大气污染措施之一。

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District Circuit Appeals Court-rejected Cross-State Air Pollution Rule and the Mercury Air Toxics Standard, are heavily premised upon condemnation of PM2.5 as a killer.

FORBES: EPA Charged With Lethal Experiments On Hundreds Of Unsuspecting Subjects