Try the subway, bus or train. Try car pooling, walking or bicycling. Avoid idling and don't speed. Also please try to combine trips.
Carbon monoxide is a deadly gas.
Ground level ozone is a serious air quality problem in the northeast and mid Atlantic states. Ozone damages the lungs, and destroys crops. When ozone levels are approaching high levels, children, the elderly, individuals with heart or respiratory ailments and healthy people who work or exercise outdoors, should move indoors if breathing becomes difficult. The New York City regions's worst air quality problem is ozone. Transportation sources, such as cars, are a large source of this problem.