The authors say that increased levels of aerosols — particles of pollution in the air above China — are caused by increasing fossil fuel consumption, particularly in big cities like Beijing.

作者指出，在中国，尤其是在像北京等大城市，空气中的粒子污染物气溶胶溶度的不断上升，是由大量化石燃料燃烧造成的。

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So -let's focus our attention now on ways of controlling or reducing the amount of air pollution caused by the car.

因此，我们现在应把注意力放在控制或者减少由汽车产生的空气污染方法上来。

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The researchers noted that proving that air pollution from vehicles caused illness was difficult.

研究人员指出，要证明车辆导致的空气污染会造成疾病并不是一件容易的事，因为这些被研究的污染物既来自汽车、卡车，也来自其他工业。

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The level of air pollution caused by vehicles across Sheffield is being monitored at sites across the city.

BBC: Traffic pollution tested across Sheffield

The package would "allow EU governments to calculate costs related to noise, air pollution and congestion caused by lorries, and then levy the relevant charge, " he said.

BBC: EU plans new charges for lorries

Marathon organisers are also monitoring the air pollution levels in London for any change caused by the volcanic eruption in Iceland.

BBC: Britain's Mara Yamauchi arrives in London for Marathon