When do the smog exempt years go up?

Smog-exempt years generally apply to vehicles that are older than a certain age, allowing them to bypass emissions testing. In California, for example, vehicles that are 1975 model year or older are exempt from smog checks. The age limit for exemption can increase as new model years are added, typically every year, meaning that older vehicles gradually become exempt as the cutoff year advances. Always check local regulations, as these can vary by state or region.