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SUSSEX COUNTY

Sussex 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

0.023 0.033 0.7 0% 35% 40% 22% 3%
0.8 0.45 1.7 0% 4% 1% 3% 92%*
0.41 0.13 3.1 0% 49% 30% 19% 2%
0.55 0.17 3.2 0% 0% 0% 0% 100%
0.000015 0.000083 0.18 23% 73% 3% 1% 0%
0.24 0.0033 72 0% 0% 65% 35% 0%
0.00018 0.00043 0.41 89% 11% 0% 0% 0%
1.0 0.077 13 0% 5% 2% 2% 91%*
0.0000001 0.0002 0.0005 100% 0% 0% 0% 0%
0.024 0.029 0.82 0% 53% 26% 16% 5%
32% 44% 21% 3% 0%
0.00000003 0.025 1.2E-06 4% 96% 0% 0% 0%
0.018 0.17 0.1 2% 98% 0% 0% 0%
0.0003 0.11 0.002 99% 1% 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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