另处，物理性污染没有后效作用，即噪声不会残存在环境中，噪声停止，污染立即消失。
Noise is transient; once the pollution stops, the environment is free of it.
轻的污染是工业文明的一个副作用。
Light pollution is a side effect of industrial civilization.
公众参与大气污染防治具有重要的作用。
Public participation can play a very important role in preventing and controlling air pollution.
砷污染对植物、动物和人体均产生毒害作用。
Arsenic pollution has poisoning effect on plant, animal and human being.
在水体污染方面具有重要的指示作用。
弄清城市噪声污染情况对噪声控制和城市规划有指导作用。
Ascerting the noise pollution will guide noise control and the city planning.
物理稀释作用对水相中污染物浓度降低的贡献相对较小；
The contribution of physical dilution to the water quality recoverability is relatively small;
物理稀释作用对水相中污染物浓度降低的贡献相对较小；
The contribution of physical dilution to the water quality recoverability is relatively small;
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