The three most recent model year vehicles are excempt from emission testing each year
The quantity of air pollutants released from a vehicle's exhaust is measured during emissions testing. California conducted the initial emissions tests in 1966. Since then, numerous states have started mandating testing for all automobiles with registrations. If a car doesn't pass the emissions test, it needs to be fixed and then tested again.
Currently, depending on a variety of circumstances, 32 states mandate some kind of emissions inspection while emissions testing. For instance, Massachusetts mandates an annual visual smoke check on all vehicles over 15 years old. While some states want annual testing, others only demand it once every two years.
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