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SALEM COUNTY

Salem County Average 2014 NATA Modeled Air Concentrations Compared to Health Benchmarks
Pollutant Modeled Air Concentration (ug/m3) Health Benchmark (ug/m3) Risk Ratio % Contribution by Source Category
Point Sources Nonpoint Sources Onroad Mobile Nonroad Mobile

Background& Secondary

0.026 0.033 0.78 <1% 26% 44% 25% 4%
0.91 0.45 2 0% 2% 4% 2% 92%*
0.41 0.13 3 4% 34% 36% 24% 2%
0.55 0.17 3.2 0% 0% 0% 0% 100%
0.000035 0.000083 0.4 46% 6% 0% 48% 0%
0.39 0.0033 188 0% 0% 31% 69% 0%
0.001 0.00043 2.3 99% 1% 0% 0% 0%
1.1 0.077 14 1% 3% 3% 2% 91%*
0.0000011 0.0002 0.005 100% 0% 0% 0% 0%
0.029 0.029 1 2% 47% 28% 16% 7%
33% 2% 1% 64% 0%
0.00038 0.025 0.01 100% 0% 0% 0% 0%
0.04 0.17 0.2 5% 95% 0% 0% 0%
0.0013 0.11 0.11 100% 0% 0% 0% 0%












  • Chemicals with risk ratios greater than or equal to 1 are in bold.
    Risk Ratios based on noncarcinogenic effects are in italics.
    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.
    For diesel particulate matter, onroad and nonroad concentrations include a model-estimated background concentration.
    *Acetaldehyde, acrolein 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.


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