1. 63005 2. St. Louis County, Missouri 3. Cancer is the uncontrollable and abnormal growth of cells. 4. Human health risk - Degree of likelihood that one or more exposures to a hazardous substance may have damaged or will damage the health of the exposed person(s). 5. Mobile Sources – 91%. Mobile sources contribute significantly to air pollution. Driving a car is probably a person's single most polluting daily activity. Nationwide, mobile sources are responsible for about 75% of carbon monoxide pollution, and more oxides of nitrogen emissions than area or point sources 6. Area Sources – 6%. Area sources include small pollution sources like dry cleaners, gas stations, and auto body paint shops. Area sources are defined as sources that emit less than 10 tons per year of a criteria or hazardous air pollutant or less than 25 tons per year of a combination of pollutants. 7. Point Sources – 3%. Point sources include major industrial facilities like chemical plants, steel mills, oil refineries, power plants, and hazardous waste incinerators. Point sources
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