The only solution to Utah's air-quality problems lies in a market-driven approach.
The state should impose a $1 to $2 per gallon tax on fuels sold in Utah. This will cause people to drive less, use public transport more and encourage alternative fuels. This is exactly what happened when gas prices spiked a few years ago.
Hoping people will voluntarily cut back on driving when gas prices are around $3 per gallon is not going to work. Are you driving less?