Salem County Average 2002 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
0.02%
3%
40%
8%
49%
Acrolein
0.05
0.020
3
0.1%
17%
65%
18%
0%
Arsenic Compounds
0.0002
0.00023
0.9
10%
12%
10%
9%
59%
Benzene
1
0.13
8
1%
23%
33%
10%
33%
1,3-Butadiene
0.05
0.033
1.6
1%
0.4%
39%
13%
47%
Cadmium Compounds
0.00008
0.00024
.03
17%
24%
0%
3%
56%
Carbon Tetrachloride
0.6
0.067
9
0.001%
0.04%
0%
0%
99.9%
Chloroform
0.07
0.043
1.7
0.4%
22%
0%
0%
78%
Chromium (hexavalent form)
0.00006
0.000083
0.7
54%
8%
12%
4%
22%
1,4-Dichlorobenzene
0.04
0.091
0.5
2%
49%
0%
0%
49%
1,3-Dichloropropene
0.03
0.25
0.1
0.004%
100%
0%
0%
0%
Diesel Particulate Matter
1
0.0033
315
0%
0%
36%
64%
*
Ethylbenzene
0.2
0.4
0.5
1%
7%
70%
22%
0%
Ethylene Oxide
0.007
0.011
0.7
6%
5%
0%
0%
89%
Formaldehyde
1
0.077
14
2%
3%
26%
9%
60%
Methyl Chloride
1
0.56
2
0.003%
0.2%
0%
0%
99.8%
Methyl tert-butyl ether
1
3.8
0.3
0.4%
16%
40%
44%
0%
Naphthalene
0.05
0.029
1.6
3%
32%
17%
3%
45%
PAH/POM
0.02
0.0075
2
1%
90%
6%
3%
0%
Perchloroethylene
0.08
0.17
0.4
0.3%
57%
0%
0%
43%
1,1,2-Trichloroethane
0.2
0.063
3
0.00004%
100%
0%
0%
0%
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.
