$3,500 Cash To Stop Driving

Dallas will pay drivers as much as $3,500 to give up their old cars in an effort to improve air quality.

Here's why that's smarter than the usual way government tries to keep cars from polluting: Most cars that cause pollution are more than 10 years old, so targeting these will have the biggest bang for the buck.

In comparison, the usual method, having every driver have their car inspected and pollution controls checked every year, is a waste of time and money.

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