SOMERSET
COUNTY
| Somerset
County Average 1996 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 |
Area |
Onroad
Mobile |
Nonroad
Mobile |
Background |
| Acetaldehyde |
0.76 |
0.45 |
2 |
0.01% |
10% |
56% |
34% |
0% |
| Acrolein |
0.093 |
0.02 |
5 |
0.04% |
9% |
59% |
32% |
0% |
| Acrylonitrile |
0.0015 |
0.015 |
0.1 |
62% |
38% |
0% |
0% |
0% |
| Arsenic
compounds |
0.000057 |
0.00023 |
0.2 |
15% |
84% |
1% |
0.04% |
0% |
| Benzene |
1.2 |
0.13 |
9 |
1% |
2% |
36% |
19% |
41% |
| Beryllium
compounds |
0.000013 |
0.00042 |
0.03 |
4% |
96% |
0% |
0.0001% |
0% |
| 1,3-Butadiene |
0.039 |
0.0036 |
11 |
0.001% |
0.4% |
83% |
17% |
0% |
| Cadmium
compounds |
0.000078 |
0.00029 |
0.3 |
5% |
95% |
0% |
0.0001% |
0% |
| Carbon
tetrachloride |
0.88 |
0.067 |
13 |
0.0002% |
0.1% |
0% |
0% |
100% |
| Chloroform |
0.10 |
0.043 |
2 |
14% |
6% |
0% |
0% |
80% |
| Chromium
compounds |
0.0017 |
0.00025 |
7 |
7% |
85% |
3% |
6% |
0% |
| Coke
oven emissions |
0 |
0.0016 |
0 |
0% |
0% |
0% |
0% |
0% |
| 1,3-Dichloropropene |
0.086 |
0.25 |
0.3 |
0% |
100% |
0% |
0% |
0% |
| Diesel
particulate matter |
3.3 |
0.5 |
7 |
0% |
0% |
31% |
68% |
*** |
| Ethylene
dibromide |
0.0077 |
0.0045 |
2 |
0.01% |
0.03% |
0% |
0% |
100% |
| Ethylene
dichloride |
0.061 |
0.038 |
2 |
0.4% |
0.2% |
0% |
0% |
99% |
| Ethylene
oxide |
0.0051 |
0.011 |
0.5 |
37% |
63% |
0% |
0% |
0% |
| Formaldehyde |
1.2 |
0.077 |
15 |
0.3% |
6% |
33% |
39% |
22% |
| Hexachlorobenzene |
0.000093 |
0.0022 |
0.04 |
0% |
0.1% |
0% |
0% |
100% |
| Hydrazine |
0.000062 |
0.0002 |
0.3 |
94% |
6% |
0% |
0% |
0% |
| Lead
compounds |
0.0040 |
0.1 |
0.04 |
1% |
71% |
2% |
26% |
0% |
| Manganese
compounds |
0.0021 |
0.05 |
0.04 |
1% |
93% |
1% |
5% |
0% |
| Mercury
compounds |
0.0020 |
0.3 |
0.01 |
1% |
23% |
0.03% |
1% |
75% |
| Methylene
chloride |
0.50 |
2.1 |
0.2 |
9% |
61% |
0% |
0% |
30% |
| Nickel
compounds |
0.0018 |
0.0032 |
0.6 |
2% |
94% |
2% |
2% |
0% |
| Perchloroethylene |
0.26 |
0.17 |
2 |
2% |
44% |
0% |
0% |
55% |
| Polychlorinated
biphenyls |
0.00038 |
0.01 |
0.04 |
0% |
0.002% |
0% |
0% |
100% |
| Polycyclic
organic matter |
0.071 |
0.018 |
4 |
2% |
98% |
0.4% |
0.1% |
0% |
| 7-PAH |
0.0038 |
0.0051 |
0.7 |
0.02% |
96% |
3% |
0.3% |
0% |
| Propylene
dichloride |
0.00010 |
0.053 |
0.002 |
55% |
45% |
0% |
0% |
0% |
| Quinoline |
0.0000021 |
0.00029 |
0.01 |
0% |
100% |
0% |
0% |
0% |
| 1,1,2,2-Tetrachloroethane |
0.00071 |
0.017 |
0.04 |
72% |
28% |
0% |
0% |
0% |
| Trichloroethylene |
0.13 |
0.5 |
0.3 |
3% |
34% |
0% |
0% |
63% |
| Vinyl
chloride |
0.0023 |
0.11 |
0.02 |
72% |
28% |
0% |
0% |
0% |
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