Especially in the summer, the hot temperatures can exacerbate the problem.
You can be part of the solution by taking some simple steps for cleaner air.
Keep your vehicle maintained properly, drive a "cleaner" vehicle, carpool, vanpool, or use park-and-ride.
You can find more tips to help drive cleaner as well as enter to win a hybrid car at www.drivecleanacrosstexas.org.
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