SALEM
COUNTY
SALEM County Average 2005 NATA Modeled Air Concentrations Compared to Health Benchmarks |
Pollutant |
Modeled
Air Concentration (ug/m3) |
Health
Benchmark (ug/m3) |
Risk
Ratio |
%
Contribution from |
Point Sources |
Nonpoint
Sources |
On-road
Mobile Sources |
Nonroad
Mobile Sources |
Background & Secondary |
Acetaldehyde |
1.6 |
0.45 |
3.6 |
<1% |
2% |
2% |
1% |
95%* |
Acrolein |
0.035 |
0.020 |
1.7 |
<1% |
26% |
9% |
5% |
60%* |
Arsenic Compounds |
0.00019 |
0.00023 |
0.8 |
10% |
14% |
5% |
3% |
68% |
Benzene |
0.59 |
0.13 |
4.6 |
1% |
13% |
20% |
7% |
59% |
1,3-Butadiene |
0.45 |
0.033 |
1.4 |
<1% |
<1% |
32% |
11% |
57% |
Cadmium Compounds |
0.000077 |
0.00024 |
0.3 |
9% |
27% |
0% |
1% |
63% |
Carbon Tetrachloride |
0.61 |
0.067 |
9.1 |
0% |
<1% |
0% |
0% |
100% |
Chloroform |
0.076 |
0.043 |
1.8 |
<1% |
22% |
0% |
0% |
78% |
Chromium (hexavalent form) |
0.00015 |
0.000083 |
1.8 |
86% |
3% |
2% |
<1% |
9% |
Cobalt Compounds |
0.000028 |
0.00011 |
0.2 |
100% |
0% |
0% |
0% |
0% |
1,4-Dichlorobenzene |
0.042 |
0.091 |
0.5 |
<1% |
50% |
0% |
0% |
50% |
1,3-Dichloropropene |
0.026 |
0.25 |
0.1 |
0% |
100% |
0% |
0% |
0% |
Diesel Particulate Matter |
0.36 |
0.0033 |
110 |
0% |
0% |
66% |
34% |
0% |
Ethylbenzene |
0.080 |
0.4 |
0.2 |
3% |
16% |
55% |
26% |
0% |
Ethylene Oxide |
0.0094 |
0.011 |
0.8 |
24% |
4% |
0% |
0% |
72% |
Formaldehyde |
1.8 |
0.077 |
23 |
<1% |
2% |
4% |
2% |
92%* |
Methyl Chloride |
1.2 |
0.56 |
2.2 |
1% |
<1% |
0% |
0% |
99% |
Naphthalene |
0.049 |
0.029 |
1.7 |
1% |
31% |
21% |
3% |
44% |
Nickel Compounds |
0.00065 |
0.0021 |
0.3 |
51% |
34% |
1% |
7% |
7% |
PAH/POM |
0.017 |
0.0072** |
2.1 |
1% |
95% |
2% |
2% |
0% |
Perchloroethylene |
0.08 |
0.17 |
0.5 |
1% |
56% |
0% |
0% |
43% |
1,1,2-Trichloroethane |
0.21 |
0.063 |
3.3 |
0% |
100% |
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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