1) Air pollution in New York City is concentrated and comes from various mobile and area sources such as vehicles, ports, airports, industry, and dry cleaners. 2) New York County has the highest air pollution risk levels in the state due to carcinogens like 1,3-butadiene and formaldehyde from mobile sources. 3) High asthma rates, especially in East Harlem, are linked to air pollution and cost the city over $240 million annually for hospitalizations.