Ah, so theres a bigger agenda here than what I first thought:
http://www.cnn.com/2004/TECH/science/09/24/greenhouseemissions.ap/index.html
TITLE: "CA tightens auto emission regulations"
California air regulators Friday unanimously approved the world's most stringent rules to reduce auto emissions that contribute to global warming -- a move that could affect car and truck buyers from coast to coast.
Under the regulations, the auto industry must cut exhaust from cars and light trucks by 25 percent and from larger trucks and sport utility vehicles by 18 percent.
...
The new standards could have coast-to-coast effect: Because California represents 10 percent of the national auto market, the auto industry often overhauls all of its cars to meet California's standards.
Also, other states sometimes follow California's lead when it comes to adopting clean-air standards. In fact, New York has already said it would adopt the new regulations, and several other Northeastern states and Canada are expected to do the same.