air pollution

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

空污染有许多来源, 例。

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

燃放鞭炮会产生巨大噪声,严重污染大。

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

这座城市空污染程度曾高达可接受标准四倍。

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

综述了苔藓大污染、重金属污染和矿藏监测指示作用。

California's air pollution guidelines are stringent.

加州制定空污染标准很严格。