Hot weather worsens air pollution by turning car exhaust into smog, which can make life miserable for people with asthma and other breathing problems.

炎热的天气使汽车尾气变成烟雾，加剧了空气污染，这可能使患有哮喘和其他有呼吸问题的人的生活更加痛苦。

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A car can be driven as far on a gallon of the new plant-based fuel as a car can be driven on a gallon of gasoline, but a gallon of the plant-based fuel both costs less and results in less pollution.

汽车使用一加仑这种新植物燃料或一加仑汽油可以开得一样远；但是一加仑植物燃料不但花费少，并且造成的污染更少。

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My topic today is “The Car and Air Pollution”.

我今天的话题是“轿车与空气污染”。

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And the dymaxion car -- which could have provided safe, pollution-free transportation using little gasoline -- was never produced.

VOA: special.2010.05.30

Politicians who worry a lot about car-industry jobs are also beginning to realise that there can be votes in curbing car use where congestion and air pollution are worst.

ECONOMIST: Global pile-up

Other steps discussed at the conference range from the practical, such as replacing biomass fuels with kerosene or natural gas, to the idealism of cities developed so that no cars are needed, and thus no car-related pollution is generated.

CNN: Air pollution kills, but deaths can be prevented

We then ranked these areas equally based on number of per capita fatal car accidents, amount of particle pollution and length of travel delays.

FORBES: ? AP Photo/Don Ryan