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CAMDEN COUNTY

Camden 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

0.049 0.033 14.8 0% 17% 53% 27% 3%
1 0.45 2 0% 4% 9% 3% 86%*
0.57 0.13 4.3 4% 23% 46% 25% 2%
0.55 0.17 3.2 0% 0% 0% 0% 100%
0.000037 0.000083 0.44 41% 18% 1% 40% 0%
0.63 0.0033 190 0% 0% 50% 50% 0%
0.00029 0.00043 0.67 89% 11% 0% 0% 0%
1.3 0.077 16 0% 5% 5% 6% 84%*
0.00000087 0.0002 0.004 100% 0% 0% 0% 0%
0.05 0.029 1.7 2% 46% 29% 13% 10%
41% 5% 2% 52% 0%
0.000058 0.025 0.002 99% 1% 0% 0% 0%
0.028 0.17 0.16 7% 93% 0% 0% 0%
0.0022 0.11 0.02 100% 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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