Take the bus, subway or train. If you live in New York City you're probably already used to taking mass transit wherever you go, but big cities aren't the only places that offer public transportation. Get familiar with your city or town's bus or train routes, and start replacing your car commute with a bus trip at least once a week. Work up to using public transportation as often as possible, only using your car when you can't figure out a good alternative.
Taking a bus or train to work, school or any other activity has a lot of advantages. Aside from doing your part to reduce air pollution, you'll have extra time to read, knit, do crosswords, or people watch. Taking public transportation is also safer than driving, and will probably help reduce your anxiety level since you won't have to deal with rush hour traffic.