Settling for the minimum

In June 2008, Arizona adopted its own vehicle-pollution standards, limits on emissions from cars and trucks that the state’s environmental regulators said held the long-term promise of cleaner air and lower fuel costs for motorists.

The step was unusual because states typically abide by federal rules regulating tailpipe exhaust, but Arizona and a dozen other states decided to impose the stricter limits in an effort to accelerate clean-air gains.
Read more: http://www.azcentral.com/news/air-quality/?content=5-response#ixzz1lKhz3X7i

Article courtesy of azcentral.com-the Air Qe Breathe by Shaun McKinnon