Is your gas cap contributing to air pollution? - WBTV 3 News, Weather, Sports, and Traffic for Charlotte, NC

Is your gas cap contributing to air pollution?

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GASTON COUNTY, NC (WBTV) -

How often do you check your gas cap? Chances are, the answer is, not often.

Environmentalists say leaky gas caps are contributing to air pollution. They estimate about 17 percent of vehicle gas caps are either damaged or missing – sending millions of gallons of gasoline evaporating in the air.

But experts say this is a problem everyone can try to fix. Some newer cars will tell you if your gas cap isn't on properly. Gas cap issues are usually caught during car inspection but if the car is older or the leak is small, the onboard diagnostic on the newer cars doesn't catch those leaks.

Experts say if the check engine light comes on while driving around just after gassing up, the easiest thing to check is to go back and make sure the cap is on correctly.

Drivers simply have to inspect their gas caps. Alan Giles, a Mecklenburg County Air Quality specialist says "a good indicator is if the seal - the rubber gasket in the cap is cracked, or has breaks in it or the locking mechanism isn't really tight. it is supposed to click three times."

Today the City of Gastonia and The Gastonia Urban Area Metropolitan Planning Organization teamed up with air quality experts to test gas caps and give away free caps if needed.