Sludge is the secondary pollutants that come from wastewater treatment. It has become solid waste pollution problem needed to be solved urgently.

污泥是废水处理之后引入的二次污染，它已经成为目前环境方面急需解决的固废污染问题。

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Then, this article on the status of solid waste pollution in rural areas is introduced and a brief analysis of the causes of pollution in rural areas of solid analysis.

然后，本文对农村固体废物污染现状做了介绍，并简要分析了农村固体的污染原因分析。

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Urban environment treatment includes urban air pollution treatment, urban water pollution treatment, urban solid waste pollution treatment and urban noise pollution treatment, etc.

城市环境治理包括城市大气污染治理、城市水污染治理、城市固体废物污染治理、城市噪声污染治理等四类。

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The debate over air pollution and, more specifically, the regulation of air pollution, raged on this week as the Environmental Protection Agency (EPA) watered down its cross-state pollution rule and House Republicans moved to delay new rules on toxic air pollution from cement plants, solid waste incinerators, and industrial boilers.

FORBES: Two New Reasons to Worry about Air Pollution: Obesity and Diabetes

Solid waste combustion, sewage treatment, stone quarrying, marinas, and oil and coal-fired power plants have air pollution damages larger than their value added.

FORBES: Pollution Costs More Than What is Produced to Make the Pollution