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MIDDLESEX COUNTY

Middlesex 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

0.04 0.033 1 0% 19% 54% 24% 3%
0.97 0.45 2 0% 3% 7% 3% 87%*
0.55 0.13 4 1% 26% 47% 24% 2%
0.55 0.17 3.2 0% 0% 0% 0% 100%
0.000031 0.000083 0.3 68% 28% 1% 3% 0%
0.57 0.0033 172 0% 0% 58% 42% 0%
0.00026 0.00043 0.6 81% 19% 0% 0% 0%
1.2 0.077 15.5 1% 5% 8% 4% 82%*
0.00005 0.0002 0.25 100% 0% 0% 0% 0%
0.04 0.029 1.37 10% 28% 45% 9% 8%
32% 17% 9% 42% 0%
0.0000004 0.025 0.000016 62% 38% 0% 0% 0%
0.026 0.17 0.15 16% 84% 0% 0% 0%
0.0008 0.11 0.007 100% 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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