According to experts' analysis, more than 70% of air pollution in cities results from autos.

据专家分析，城市空气污染70%以上是由汽车造成的。

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Based on the analysis of contributing factors, a model of parameterized combination operator in air pollution forecasting is presented, which is suitable to nonlinear problems.

在成因分析的基础上，建立了大气污染物浓度预测的参数化组合算子模型，适应非线性问题。

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From the analysis of main air pollution sources, important applications of plants in controlling indoor air pollution are given in this paper.

从分析室内空气污染的主要来源入手，论述绿色植物在控制居室空气污染方面的重要作用。

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The 2011 study offers an intensive analysis of air pollution in more than 900 counties and more than 200 Metropolitan Statistical Areas (MSA) and Combined Statistical Areas (CSA), or cities and their surrounding suburbs.

FORBES: List: America's Most Polluted Cities