No disrepect to the OP, but the whole thing about 50 state standards is utter nonsense cooked up by the auto makers. Under section 209(b), title 2 of the Clean Air Act (CAA), no state other than California may impose emission standards different from USEPA's. 42 U.S.C. sec. 7543(b). Congress set up the CAA this way in recognition of California's unique air quality problems and the State's traditional role as a laboratory of innovative air pollution regulations (California imposed its own emission standards long before USEPA did).
Under sec. 209(b), California may only enforce its own emission standards upon receiving a waiver from USEPA. No other state can impose any different standards from California's or the federal ones. In other words, states have only two choices: Choose California's standards exactly or choose the federal EPA standards. There is NO possibility under the Clean Air Act of 50 different state emission standards.
Bottom line: There have always been and can only be two standards -- California's and USEPA's. All this stuff about a patchwork of regulations is nonsense and a red herring to deflect attention from the auto industry's other failings.
See
http://www.law.cornell.edu/uscode/ht...3----000-.html for more info.
If you don't like it, lobby Congress to change the law that it set up; USEPA, California, and the other states that adopt California's standards are simply operating under the law that Congress set up 40 years ago and hasn't seen a reason to change it so far. Why? Because it has worked.
As Johnny Storm says, "Flame on!"