Urban19, I would suggest that you thourghoughly review the laws and regulations you choose to fight and defend. CA can have more stringent AQ and transportation laws, but it cannot have more lax ones. What I provided was based upon federal law, only the time-line is appropriate for MI. CA must have more stringent laws because so much of the state is non-attainment. Michigan is mostly in maintenance except for a few small spots where PM 0.25 is an issue.