Interestingly, it is the more expensive vehicles that used car shoppers seem to be considering, if web statistics are anything to go by. Perhaps consumers who are used to a certain level of luxury need to spend less but don't want to buy a cheap car.
Why should we care whether new cars or used cars are being purchased? The newer the vehicle, the more likely it is to meet the latest and most stringent emissions regulations required by the government. Put simply, new cars are often cleaner than older cars. So, as more miles are put on older cars, more pollution is emitted from their tailpipes.
[Source: Business Week]