PM10 is an important indicator of urban air pollution, and the health risks associated with the complex mixtures of pollutants typically found in cities.

PM 10是城市空气污染以及在城市中通常发现的与污染物的复杂混合物相关健康风险的一项重要指标。

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The sources of heavy metals pollution are complex, so it is necessary to study the reasons and countermeasures of over standard.

重金属污染来源很复杂，对中药产品中的重金属元素超标的原因及对策的研究势在必行。

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"Particulate matter," also known as particle pollution, is a complex mixture of extremely small particles and liquid droplets.

颗粒物也被称之为颗粒物污染，它是非常小的颗粒同液滴结合的一种复杂混合物。

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As big trading firms Morgan Stanley and Merrill Lynch push into the market, boutique brokerages like Evolution must deal in complex custom trades, combining pollution credits with other derivatives in deals that help companies mitigate several risks at once.

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