SALEM COUNTY
Salem 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 |
0.026 |
0.033 |
0.78 |
<1% |
26% |
44% |
25% |
4% |
Acetaldehyde |
0.91 |
0.45 |
2 |
0% |
2% |
4% |
2% |
92%* |
Benzene |
0.41 |
0.13 |
3 |
4% |
34% |
36% |
24% |
2% |
Carbon tetrachloride |
0.55 |
0.17 |
3.2 |
0% |
0% |
0% |
0% |
100% |
Chromium (hexavalent form) |
0.000035 |
0.000083 |
0.4 |
46% |
6% |
0% |
48% |
0% |
Diesel Particulate Matter |
0.39 |
0.0033 |
188 |
0% |
0% |
31% |
69% |
0% |
Ethylene oxide |
0.001 |
0.00043 |
2.3 |
99% |
1% |
0% |
0% |
0% |
Formaldehyde |
1.1 |
0.077 |
14 |
1% |
3% |
3% |
2% |
91%* |
Hydrazine |
0.0000011 |
0.0002 |
0.005 |
100% |
0% |
0% |
0% |
0% |
Naphthalene |
0.029 |
0.029 |
1 |
2% |
47% |
28% |
16% |
7% |
Nickel Compounds |
0.0011 |
0.0021 |
0.5 |
33% |
2% |
1% |
64% |
0% |
Nitrobenzene |
0.00038 |
0.025 |
0.01 |
100% |
0% |
0% |
0% |
0% |
Tetachloroethylene |
0.04 |
0.17 |
0.2 |
5% |
95% |
0% |
0% |
0% |
Vinyl chloride |
0.0013 |
0.11 |
0.11 |
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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