I was wondering about how prevalent this is - I've never had a car emissions-tested - and it looks like 31 states + DC have emissions testing in at least some p

I was wondering about how prevalent this is - I've never had a car emissions-tested - and it looks like 31 states + DC have emissions testing in at least some part of the state [0]. Just glancing over this list, it looks like several states only test in metro areas, or otherwise have exceptions; even California has counties which do not test for emissions. Specifically, it looks like several states exempt from testing cars from the mid 90s and older. Lots of those still on the road. [0]: https://en.wikipedia.org/wiki/Vehicle_inspection_in_the_United_States#Jurisdictions_requiring_periodic_vehicle_emissions_inspections https://en.wikipedia.org/wiki/Vehicle_inspection_in_the_Unit...