While air pollution and chemicals are believed to pose a major threat, our analysis determined that tourism served as the silent killer.

虽然空气污染和化学物质被确认为是主要的威胁，但我们的分析认定，旅游业也是一个无声的杀手。

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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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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