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Nearly one half of all Americans-an estimated 150 million-live in areas that don't meet federal air quality standards. Passenger vehicles and heavy-duty trucks are a major source of this pollution, which includes ozone, particulate matter, and other smog-forming emissions.The health risks of air pollution are extremely serious. Poor air quality increases respiratory ailments like asthma and bronchitis, heightens the risk of life-threatening conditions like cancer, and burdens our health care system with substantial medical costs. Particulate matter is singlehandedly responsible for up to 30,000 premature deaths each year.
Smog formation from vehicle emissions and other sources
Passenger vehicles are a major pollution contributor, .... READ FULL ARTICLE