Hunterdon County Average 1999 NATA Modeled Air Concentrations Compared to Health Benchmarks
Pollutant
Modeled
Air Concentration (ug/m3)
Health
Benchmark (ug/m3)
Risk
Ratio
%
Contribution from
Major Sources
Area
Sources
On-road
Mobile Sources
Nonroad
Mobile Sources
Background
Acetaldehyde
1
0.45
2
1%
3%
43%
7%
45%
Acrolein
0.06
0.020
3
0.02%
13%
69%
17%
0%
Arsenic Compounds
0.00004
0.00023
0.2
48%
52%
0%
0%
0%
Benzene
0.9
0.13
7
0.2%
13%
35%
12%
40%
Bis(2-ethylhexyl)phthalate
2
0.42
4
0.001%
0.009%
0%
0%
100%
1,3-Butadiene
0.04
0.033
1.3
0.002%
2%
46%
22%
30%
Cadmium Compounds
0.00003
0.00024
0.1
40%
59%
0%
1%
0%
Carbon Tetrachloride
0.3
0.067
4
0.006%
0.1%
0%
0%
100%
Chloroform
0.06
0.043
1.4
14%
26%
0%
0%
61%
Chromium (hexavalent form)
0.0001
0.000083
1.5
5%
91%
4%
0.2%
0%
1,4-Dichlorobenzene
0.02
0.091
0.2
0.2%
100%
0%
0%
0%
1,3-Dichloropropene
0.04
0.25
0.2
0%
100%
0%
0%
0%
Diesel Particulate Matter
2
0.0033
506
0%
0%
47%
53%
*
Ethylene Dibromide
0.01
0.0017
8
0.01%
0.002%
0%
0%
100%
Ethylene Dichloride
0.03
0.038
0.7
1%
0.07%
0%
0%
99%
Ethylene Oxide
0.003
0.011
0.2
8%
92%
0%
0%
0%
Formaldehyde
1
0.077
14
0.6%
5%
29%
10%
56%
Methyl Chloride
1
0.56
2
0.08%
0.2%
0%
0%
100%
Naphthalene
0.03
0.029
0.9
3%
62%
30%
5%
0%
Nickel Compounds
0.0005
0.0064
0.1
13%
82%
4%
0.6%
0%
Perchloroethylene
0.09
0.17
0.5
0.5%
36%
0%
0%
64%
1,1,2,2-Tetrachloroethane
0.04
0.017
2
0.3%
0.1%
0%
0%
100%
Chemicals with risk ratios greater than or equal to 1 are
in bold.
Risk Ratios in italics are based on noncarcinogenic effects.
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.
