The character and influence factors of pollution along roadside were differed from the routine air monitoring data.

路边空气污染的特征和影响因素与传统空气监测数据有较大差别。

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There has been almost no consideration for the possible influence of environmental factors such as pollution.

因为既往几乎没有考虑到环境因素如污染对这一疾病可能产生的影响。

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External environmental causes of cancer are factors in the environment that increase risk of cancer such as air pollution, UV radiation and indoor radon.

外部环境致癌因素是指环境中导致罹患癌症的危险升高的因素，如空气污染、紫外线辐射及室内的氡等。

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The study also cited other factors as contributing to the plight of the urban poor such as improper sanitation, contaminated drinking water, and urban pollution.

BBC: Indian children 'malnourished'

Scientists have been puzzling for some time over exactly what combination of factors is preventing the earth getting even warmer - maybe changes in solar activity, ocean currents or emissions of aerosol pollution.

BBC: Flooding in York