SOMERSET COUNTY
| Somerset 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 |
| 1,3-Butadiene |
0.042 |
0.033 |
1.2 |
0% |
24% |
60% |
14% |
2% |
| Acetaldehyde |
0.95 |
0.45 |
2.1 |
0% |
4% |
7% |
1% |
88%* |
| Benzene |
0.53 |
0.13 |
4 |
1% |
34% |
50% |
13% |
2% |
| Carbon tetrachloride |
0.55 |
0.17 |
3.2 |
0% |
0% |
0% |
0% |
100% |
| Chromium (hexavalent form) |
0.000025 |
0.000083 |
0.3 |
65% |
24% |
2% |
9% |
0% |
| Diesel Particulate Matter |
0.52 |
0.0033 |
157 |
0% |
0% |
71% |
29% |
0% |
| Ethylene oxide |
0.00037 |
0.00043 |
0.86 |
97% |
3% |
0% |
0% |
0% |
| Formaldehyde |
1.2 |
0.077 |
15.5 |
1% |
5% |
6% |
2% |
86%* |
| Hydrazine |
0.00001 |
0.0002 |
0.05 |
100% |
0% |
0% |
0% |
0% |
| Naphthalene |
0.038 |
0.029 |
1.3 |
1% |
38% |
43% |
11% |
7% |
| Nickel Compounds |
0.00046 |
0.0021 |
0.2 |
34% |
17% |
14% |
35% |
0% |
| Nitrobenzene |
0.0000001 |
0.025 |
0.000001 |
38% |
62% |
0% |
0% |
0% |
| Tetachloroethylene |
0.024 |
0.17 |
0.14 |
6% |
94% |
0% |
0% |
0% |
| Vinyl chloride |
0.0004 |
0.11 |
0.003 |
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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