CUMBERLAND
COUNTY
Cumberland County Average 2011 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 |
1.7 |
0.45 |
3.8 |
<1% |
2% |
4% |
1% |
93%* |
Acrolein |
0.018 |
0.020 |
0.9 |
3% |
25% |
41% |
9% |
22%* |
Acrylonitrile |
0.00036 |
0.015 |
0.02 |
93% |
7% |
0% |
0% |
0% |
Arsenic compounds |
0.0001 |
0.00023 |
0.4 |
4% |
27% |
26% |
43% |
<1% |
Benzene |
0.76 |
0.13 |
5.8 |
1% |
28% |
49% |
20% |
2% |
1,3-Butadiene |
0.054 |
0.033 |
1.6 |
1% |
26% |
52% |
18% |
3% |
Cadmium Compounds |
0.000036 |
0.00024 |
0.2 |
29% |
63% |
0% |
8% |
<1% |
Carbon Tetrachloride |
0.55 |
0.17 |
3.2 |
0% |
0% |
0% |
0% |
100% |
Chromium (hexavalent form) |
0.00006 |
0.000083 |
0.7 |
28% |
19% |
1% |
52% |
<1% |
Diesel Particulate Matter |
0.71 |
0.0033 |
214 |
0% |
0% |
50% |
50% |
0% |
Ethylbenzene |
0.09 |
0.4 |
0.2 |
2% |
8% |
53% |
19% |
18% |
Ethylene dibromide |
0.000013 |
0.0017 |
0.008 |
100% |
0% |
0% |
0% |
0% |
Ethylene oxide |
0.00035 |
0.011 |
0.03 |
81% |
19% |
0% |
0% |
0% |
Formaldehyde |
1.3 |
0.077 |
17 |
<1% |
4% |
4% |
2% |
90%* |
Hydrazine |
0.00000062 |
0.0002 |
0.003 |
93% |
0% |
0% |
0% |
7% |
Naphthalene |
0.038 |
0.029 |
1.3 |
4% |
38% |
51% |
7% |
0% |
Nickel compounds |
0.00068 |
0.0021 |
0.3 |
14% |
6% |
2% |
78% |
<1% |
Trichloroethylene |
0.01 |
0.2 |
0.05 |
20% |
80% |
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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