air pollution

Air pollution in the city had reached four times the acceptable levels.

这座城气污染程度曾高达可接受标准四倍。

There are many sources of air pollution; exhaust fumes, for example.

气污染有许多来源, 例如废气。

Setting off firecrackers makes a tremendous noise and causes serious air pollution.

放鞭炮会产生巨大噪声,重污染大气。

California's air pollution guidelines are stringent.

加州制定气污染标准很。

This article summarized the indicating function of bryop hyte to air pollution, heavy metal pollution and mineral resources.

述了苔藓植物对大气污染、重金属污染和矿藏监测指示作用。