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Technology Transfer Network - Air Toxics Web Site

List of the 33 Urban Air Toxics

As part of the urban strategy, we have identified a list of the 33 air toxics that present the greatest threat to public health in the largest number of urban areas.

A list of 33 urban HAP's which pose the greatest threats to public health in urban areas was listed in the 1999 Strategy. This list of HAPs considered the emissions from major, area and mobile sources. A subset of this list, 30 HAPs, represents the HAPs having the greatest emissions contributing from area sources. A cross (+) denotes the HAPs with less significant emissions contributions from area sources.

acetaldehyde ethylene oxide
acrolein formaldehyde
acrylonitrile hexachlorobenzene
arsenic compounds hydrazine
benzene lead compounds
beryllium compounds manganese compounds
1, 3-butadiene mercury compounds
cadmium compounds methylene chloride
carbon tetrachloride + nickel compounds
chloroform polychlorinated biphenyls (PCBs)
chromium compounds polycyclic organic matter (POM)
coke oven emissions + quinoline
dioxin 1, 1, 2, 2-tetrachloroethane
ethylene dibromide + perchloroethylene
propylene dichloride trichloroethylene
1, 3-dichloropropene vinyl chloride
ethylene dichloride --

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