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MONMOUTH COUNTY

Monmouth 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

0.034 0.033 1 0% 15% 52% 28% 5%
0.88 0.45 2 0% 2% 6% 3% 89%*
0.47 0.13 3.6 1% 20% 47% 29% 3%
0.55 0.17 3.2 0% 0% 0% 0% 100%
0.000022 0.000083 0.26 41% 21% 2% 36% 0%
0.56 0.0033 169 0% 0% 53% 47% 0%
0.00026 0.00043 0.6 96% 4% 0% 0% 0%
1.1 0.077 14 1% 3% 4% 4% 88%*
0.0000027 0.0002 0.01 100% 0% 0% 0% 0%
0.03 0.029 1 2% 27% 40% 19% 12%
16% 13% 7% 64% 0%
0.0000002 0.025 0.000008 58% 42% 0% 0% 0%
0.021 0.17 0.12 9% 91% 0% 0% 0%
0.0005 0.11 0.004 100% 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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