Studies have shown that air pollution has a great effect on the white matter in the brain, but not the grey matter.

研究表明，空气污染对大脑中的白质有很大影响，但对灰质没有影响。

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Dry plasma cutting: also called the air-filled type cutting, the air compressor to plank cut in order to achieve the effect of cooling seam jet, such cutting costs low, but pollution is very large.

干式等离子切割：又称风冷式切割，采用空压机对板材割缝喷气以达到冷却效果，此类切割成本较低，但是污染很大。

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On the negative side, automobiles are the main source of air pollution in the world which creates the so-called green-house effect.

而消极的一面是，汽车是世界上污染的主要来源，产生了所谓的温室效应。

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He said it was difficult to estimate the true effect because cancer may develop only years after exposure to air pollution.

BBC: Traffic

She said Beijing Olympic organizers and Chinese environment authorities are providing the IOC with daily updates about pollution and weather, which can both have an effect on air quality.

CNN: Pollution, Internet, doping dominate Olympics lead-up