It’s because vehicles that were made before 1975 are likely classic vehicles that are rarely driven. It is also because the parts and engines in those cars are more expensive and harder to find than modern vehicles, and therefore can not be modified to current emission standards without fully replacing everything.
Older cars would likely fail, and especially at the time, forcing people to go out and buy new cars was seen as an undue hardship. As a result, old cars are “grandfathered in” and allowed to continue being used by virtue of them having been acceptable before.
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