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Re: 20mph is just the start.
A car doing 20mph is going to be on the same stretch of road for 50% longer, so if its putting out the same amount of pollution, you would expect the overall pollution level of that stretch to rise (by 50% ?). However, I dont know if a car puts out the same amount of pollutants at 20mph compared to 30mph.
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 Baby, I was born this way.
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