—causes 60% of the carbon monoxide in our atmosphere.
When you consider that the average person breathes in 9 000 quarts of air a day,you realize how important clean air is to human being.
The government has spent billions of dollars to control car pollution.Yet,some big cities are still in violation侵害 of public health standards that protect people from breathing poisonous air.The health care costs related to unclean air are huge.
The traditional way of cleaning up what comes out of tailpipes has not done the job of getting rid of automobile emissions散发物.Yet today’s cars produces far less pollution than models from the 1960’s.But there are now almost 51 million more cars on the road than there were in 1960,and drivers are traveling many more miles.As a result,cars are still the single largest source of city pollution today.
If we are going to achieve clean air,we need to discourage car use by individuals,especially during rush driving hours.
At the same time we reduce car use,we must also improve our public transportation system.If going to and from work by public transportation was convenient and cheap,people would use the system instead of using cars to drive to work.
Yes,it will cost money to improve our public transportation system.But we now spend billions each year in controlling car emissions without much success.Giving some of that money to public transportation would be a small price to pay for cleanest air.
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