Traffic has become synonymous with air pollution, and many countries intend to ban the sale of new petrol and diesel cars in the next two decades.

交通已成为空气污染的代名词，许多国家打算在未来20年内禁止销售新的汽油和柴油车。

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We all know that most cars, motorcycles, boats and planes cause air pollution.

我们都知道大多数汽车、摩托车、船只和飞机会造成空气污染。

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Air pollution is at its worst over big cities where millions of people live, work, and travel about in cars, buses, and trucks.

好几百万人在城市里工作、生活，还以轿车、公共汽车和卡车为交通工具，因而这种百万人口的城市空气污染最为严重。

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Race cars burn a lot of fuel, and create a lot of air pollution.

VOA: special.2009.11.03

After all,using cars to move goods causes a lot of carbon air pollution and traffic jams."

VOA: standard.2010.01.04

Boilers burning dirty heating oils No. 4 and No. 6 produce 50% more air pollution than all of the cars and trucks in New York City and contribute to more than 3, 200 premature deaths every year, according to recent reports by the Environmental Defense Fund and the New York City Department of Health.

FORBES: Big Apple's Nasty Boilers

If we could go one step further and reduce air pollution in affected communities by cutting emissions from cars, trucks and dirty industries, the impact would be even greater.

FORBES: Pay Now, Or Pay (More) Later: The Crying Need to Fund Community Prevention

That is because cars produce local air pollution, which damages human health and the environment, and also produce greenhouse gases, which contribute to global warming.

ECONOMIST: Burning issue