air pollution

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

燃放鞭炮会产生巨声,严重气。

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

空气有许多来源, 例如废气。

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

这座城市空气程度曾高达可接受准四倍。

California's air pollution guidelines are stringent.

加州制定空气准很严格。

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

综述了苔藓植物对气、重金属和矿藏监测指示作用。