The total pollution level of groundwater caused by the leachate is increasing.

渗沥液对地下水的总体污染程度正在加重。

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Studies on dynamics of microcystin pollution level in municipal water supplies.

城市供水藻毒素污染水平的动态研究。

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According to the content, the pollution level of SO_2 in the air and the resistance of vegetables to SO_2 can be indirectly determined.

从植物叶片中的硫含量可间接地判断大气被SO_2污染的程度及植物对SO_2吸收与抵抗能力的强弱。

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Prof Kevin McConway, a statistician at the Open University said, based on the findings, if Newcastle were to halve its current particulate air pollution level it would lead to two or three fewer low weight babies out of the total 3, 500 or so born in the city each year.

BBC: Traffic fumes linked to lower birth weight

Ms. VICKIE PATTON (Environmental Defense): EPA has, in a number of instances, taken a step back from its proposal and instead will allow some of these high-polluting, older coal plants to continue to discharge smog-forming and haze-forming pollution at a level that doesn't really reflect what today's modern pollution control technology can, in fact, achieve.

NPR: E.P.A Proposes New Rules on Haze

The State of the Air report also ranked the Los Angeles-Long Beach- Riverside area as having the third-highest level of annual particle pollution in the nation and the fourth-highest level of short-term particle pollution.

FORBES: Los Angeles Pollution From Car Exhaust Is Down 98%