To see a state map showing the spatial variation in modeled air concentrations (at the census-tract level) for one of the nineteen chemicals of concern, click on the map:

COUNTY RISK RATIO TABLES

To see a statewide or county -specific table containing the 1996 NATA-based risk results (including ambient air concentrations, health benchmarks, risk ratios, and source category contributions) for each of the 19 air toxics of concern, click on statewide or the county names below.

For Each Table:

• Chemicals with risk ratios greater than or equal to 1 are in bold.
• Risk Ratios in italics are based on noncarcinogenic effects.
• The symbol ug/m³ is micrograms per cubic meter, the amount (in micrograms) of a chemical in a cubic meter of air. This is also known as a concentration.
• Acetaldehyde and formaldehyde concentration estimates include secondary formation, which is the process by which chemicals in the air are transformed into other chemicals.
• PAH/POM is “polycyclic aromatic hydrocarbons/polycyclic organic matter.” These define a broad class of compounds. The chemicals making up this class were broken up into 8 groups based on toxicity, and each group was assigned a cancer-weighted toxicity estimate. 0.0072 ug/m³ is the health benchmark average across the 8 groups.

Previous NATA Risk Results

USEPA has completed six National-Scale Air Toxics Assessments, every third year beginning with the 1996 NATA. Before that, they conducted a “Cumulative Exposure Project” (CEP) for 1990 which also included an assessment of air toxics. However, they emphasize that the methods used to conduct emissions inventories, modeling, and risk assessment vary somewhat from year to year, so the results are not exactly comparable.

New Jersey’s interpretation of past USEPA data is available below.

1990 CEP Results for NJ