The important reason of causing our country source of water supplying insufficient and national water environment pollution in some area is low water efficiency and large sewage emission.
造成我国部分地区水源供给不足和全国水环境普遍污染的重要原因是用水效率低和污水排放量大。
To make quantitative analysis for air pollution situation in urban area is required in air pollution source control and air pollution emission total control.
污染源治理和大气污染总量控制的实施需要对城市进行大气污染现状的定量分析。
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