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

这座城市空气污程度曾高达可接受准四倍。

Aerial pollution is a problem that should be solved quickly.

空气污个亟待解决问题。

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

空气污有许多来源, 例如废气。

California's air pollution guidelines are stringent.

加州制定空气污准很严格。

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

3D天空光照建立在24小时(时间调整)、云彩和空气污效果基础。

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.

“煤烟型”、“光化学烟雾型”污后，现代人正进入以“室内空气污”为志第三代污时期。