Re "Clean-car standards win Utah air board endorsement" (Tribune, June 6):
Vehicles account for half of Utah's emissions. We can't clean our air without reducing them. Simple as that.
So, hurray for the Environmental Protection Agency's Tier 3 proposals to cut by an incredible 80 percent the nitrogen oxides and volatile organic compounds the "big contributors to Utah's summer ozone problem and winter smog" and cut by 70 percent "the fine soot that plagues our valleys during inversions."