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

这座城市的空气污染程度曾高达可接受准的四倍。

Aerial pollution is a problem that should be solved quickly.

空气污染是一个亟待解决的问题。

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

空气污染有许多来源, 例如废气。

California's air pollution guidelines are stringent.

加州制定的空气污染准很严格。

Heliodon Sky Vault: 3D sky based on 24 hours, clouds, pollution effects.

3D天空光照是建立在24小时(时间调整)、云彩和空气污染效果的基础上的。

Afterwards " fuliginous model " , " photochemical smog " after pollution, modern is being entered with " indoor air is polluted " the 3rd generation that is a mark pollutes period.

继“煤烟型”、“光化学烟雾型”污染后，现人正进入以“室内空气污染”为志的污染时期。