HUNTERDON 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
1.5
0.45
3.4
0%
2%
1%
1%
96%*
Acrolein
0.028
0.020
1.4
<1%
13%
5%
10%
72%*
Arsenic Compounds
0.00042
0.00023
1.8
6%
6%
1%
2%
85%
Benzene
0.82
0.13
6.3
<1%
18%
8%
7%
67%
1,3-Butadiene
0.052
0.033
1.6
0%
0%
12%
11%
77%
Cadmium Compounds
0.00012
0.00024
0.5
31%
18%
0%
<1%
51%
Carbon Tetrachloride
0.61
0.067
9.1
0%
<1%
0%
0%
100%
Chloroform
0.075
0.043
1.7
<1%
21%
0%
0%
79%
Chromium (hexavalent form)
0.00012
0.000083
1.5
15%
3%
2%
<1%
80%
Cobalt Compounds
0.000034
0.00011
0.3
100%
<1%
0%
0%
0%
1,4-Dichlorobenzene
0.062
0.091
0.7
<1%
26%
0%
0%
74%
1,3-Dichloropropene
0.03
0.25
0.1
0%
100%
0%
0%
0%
Diesel Particulate Matter
0.24
0.0033
72
0%
0%
50%
50%
0%
Ethylbenzene
0.071
0.4
0.2
1%
14%
39%
46%
0%
Ethylene Oxide
0.0084
0.011
0.8
1%
6%
0%
0%
93%
Formaldehyde
1.6
0.077
21
<1%
2%
2%
3%
93%*
Methyl Chloride
1.2
0.56
2.1
0%
<1%
0%
0%
100%
Naphthalene
0.056
0.029
1.9
<1%
33%
11%
4%
52%
Nickel Compounds
0.0003
0.0021
0.1
52%
13%
2%
<1%
33%
PAH/POM
0.014
0.0072**
2.2
<1%
95%
1%
4%
0%
Perchloroethylene
0.092
0.17
0.5
<1%
29%
0%
0%
71%
1,1,2-Trichloroethane
3.1E-7
0.063
5.0E-6
14%
86%
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.
