The one they are trying to push through here in California is for 8 counties. It will require testing for all pre 76 vehicles at change of ownership and testing every 2 years forever. Currently all vehicles 76 & newer require testing.
Just who is going to establish the test standards for Model A's, Hudsons, our trucks, modified vehicles, etc seems to be unknown. Our illustrious "Green Govenor" travels on a private jet from Sacramento to his home in So Cal and back 4 times a week. He causes more polution in one week than all of our vehicles in a lifetime.
Fred