Pay your fines now or else. Is Important The key ingredient for ground-level ozone or smog is auto exhaust, accounting for 56 percent of ozone formation in the Metropolex. The big problem is instead of reducing the number of vehicles on roadways, that number is increasing. As a result, the air keeps getting dirtier.
Ozone is mainly a daytime problem when temperatures are high, sunshine is strong and winds are weak.
On Ozone Action Days, the elderly, the young and the chronically ill are most at risk for respiratory problems. Ozone season runs through the end of October. Worn spark plugs or clogged fuel injectors can reduce fuel efficiency by up to 30 percent. When tires aren't properly inflated, fuel efficiency drops as much as 8 percent. Studies show that dirty oil can cause 35 percent of vehicles being tested to fail emissions standards, according to the North Texas Clean Air Coalition and North Central Texas Council of Governments.