According to Liu, the population controls have kept sulphur dioxide emissions down by 17.6% and the main source of water pollution by 30.8%.

刘少杰称，人口控制已经将二氧化硫的排放量降低了17.6%，水污染的主要来源减少了30.8%。

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With this method, an optimal search plan can be obtained to maximize the probability of detecting the source of water pollution within finite time.

该方法可以在搜索资源有限的条件下优化监测资源的分配方案，使成功探测到事故性污染源的概率最大。

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The livestock sector is probably the largest source of water pollution, contributing to eutrophication, 'dead' zones in coastal areas and degradation of coral reefs.

畜牧业很可能是水污染的最大来源，造成富营养化、沿海地区出现“死区”和珊瑚礁退化。

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In developing countries, the main source of water pollution is not stormwater,but waste water.

VOA: standard.2010.08.04

These bills will curb lead levels in water pipes, a major source of harmful lead exposure for children, and help address diesel engine pollution that is linked to serious health conditions like asthma and heart and lung disease.

WHITEHOUSE: Council on Environmental Quality Blog