UNION COUNTY
| Union 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 |
0.06 |
0.033 |
1.8 |
0% |
17% |
69% |
13% |
1% |
| Acetaldehyde |
0.99 |
0.45 |
2.2 |
0% |
4% |
12% |
3% |
81%* |
| Benzene |
0.62 |
0.13 |
4.7 |
3% |
24% |
62% |
9% |
2% |
| Carbon tetrachloride |
0.55 |
0.17 |
3.2 |
0% |
0% |
0% |
0% |
100% |
| Chromium (hexavalent form) |
0.000027 |
0.000083 |
0.32 |
50% |
27% |
1% |
1% |
22% |
| Diesel Particulate Matter |
0.8 |
0.0033 |
242 |
0% |
0% |
69% |
31% |
0% |
| Ethylene oxide |
0.00023 |
0.00043 |
0.53 |
90% |
10% |
0% |
0% |
0% |
| Formaldehyde |
1.3 |
0.077 |
16.8 |
2% |
6% |
10% |
5% |
77%* |
| Hydrazine |
0.000014 |
0.0002 |
0.07 |
100% |
0% |
0% |
0% |
0% |
| Naphthalene |
0.048 |
0.029 |
1.6 |
10% |
29% |
48% |
8% |
5% |
| Nickel Compounds |
0.0007 |
0.0021 |
0.3 |
53% |
13% |
4% |
30% |
0% |
| Nitrobenzene |
0.000002 |
0.025 |
0.00008 |
94% |
6% |
0% |
0% |
0% |
| Tetachloroethylene |
0.028 |
0.17 |
0.16 |
7% |
93% |
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. |
back
to county risk ratio tables
|
|
