Why you [well, some of you] must have your car smog tested

[NewsBot]

You may not think much about that little sticker affixed to a corner of your license plate or the inside of your windshield, but it signifies an achievement for your clean-running car: passing your area's emissions test. It's an annual event for many car owners across the U.S. that involves a trip to a privately run garage or a sprawling...

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