I got reported in my old Royal Monaco for visible smoke. I received a letter from the Bay Area Air Quality Managment District.
http://www.baaqmd.gov/
They offered a list of shops to help repair my polluter, as well as suggestions on where I could junk my car. They went so far as to offer financial assistance if I qualified. This agency had no teeth to make me do anything.
I showed the letter to our CHP inspector. This is when I found out the California Highway Patrol never solved the problem of cooking the right valve cover gasket on the 440 powered patrol cars with the California emissions package. Screw them.