UNION
COUNTY
UNION 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 |
2.3 |
0.45 |
5.1 |
<1% |
5% |
9% |
4% |
82%* |
Acrolein |
0.08 |
0.020 |
4 |
<1% |
21% |
18% |
10% |
51%* |
Arsenic Compounds |
0.00065 |
0.00023 |
2.8 |
2% |
13% |
7% |
5% |
73% |
Benzene |
2.1 |
0.13 |
16 |
1% |
12% |
32% |
12% |
43% |
1,3-Butadiene |
0.16 |
0.033 |
4.8 |
<1% |
<1% |
39% |
15% |
46% |
Cadmium Compounds |
0.00012 |
0.00024 |
0.5 |
8% |
50% |
0% |
1% |
41% |
Carbon Tetrachloride |
0.61 |
0.067 |
9.1 |
0% |
<1% |
0% |
0% |
100% |
Chloroform |
0.17 |
0.043 |
4 |
1% |
50% |
0% |
0% |
49% |
Chromium (hexavalent form) |
0.00048 |
0.000083 |
5.7 |
21% |
7% |
4% |
<1% |
68% |
Cobalt Compounds |
0.00009 |
0.00011 |
0.8 |
88% |
12% |
0% |
0% |
0% |
1,4-Dichlorobenzene |
0.13 |
0.091 |
1.4 |
<1% |
24% |
0% |
0% |
76% |
1,3-Dichloropropene |
0.17 |
0.25 |
0.7 |
0% |
100% |
0% |
0% |
0% |
Diesel Particulate Matter |
1.5 |
0.0033 |
459 |
0% |
0% |
49% |
51% |
0% |
Ethylbenzene |
0.56 |
0.4 |
1.4 |
1% |
31% |
45% |
23% |
0% |
Ethylene Oxide |
0.011 |
0.011 |
1 |
7% |
24% |
0% |
0% |
69% |
Formaldehyde |
2.5 |
0.077 |
33 |
<1% |
3% |
12% |
8% |
77%* |
Methyl Chloride |
1.2 |
0.56 |
2.2 |
<1% |
1% |
0% |
0% |
99% |
Naphthalene |
0.19 |
0.029 |
6.5 |
2% |
47% |
30% |
4% |
17% |
Nickel Compounds |
0.0016 |
0.0021 |
0.8 |
40% |
36% |
3% |
5% |
16% |
PAH/POM |
0.015 |
0.0072** |
2 |
<1% |
75% |
10% |
15% |
0% |
Perchloroethylene |
0.43 |
0.17 |
2.6 |
<1% |
44% |
0% |
0% |
56% |
1,1,2-Trichloroethane |
5.5E-6 |
0.063 |
9.0E-5 |
78% |
22% |
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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