Salem 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
3
2%
2%
44%
12%
40%
Acrolein
0.07
0.020
3
4%
11%
62%
23%
0%
Arsenic Compounds
0.0001
0.00023
0.5
80%
20%
0%
0%
0%
Benzene
1
0.13
8
3%
10%
37%
14%
37%
Bis(2-ethylhexyl)phthalate
2
0.42
4
0.001%
0.02%
0%
0%
100%
1,3-Butadiene
0.05
0.033
1.6
0.7%
2%
45%
18%
35%
Cadmium Compounds
0.00009
0.00024
0.4
71%
28%
0%
1%
0%
Carbon Tetrachloride
0.3
0.067
4
0.2%
0.1%
0%
0%
100%
Chloroform
0.06
0.043
1.3
2%
29%
0%
0%
69%
Chromium (hexavalent form)
0.0006
0.000083
7
3%
96%
1%
0.1%
0%
1,4-Dichlorobenzene
0.03
0.091
0.3
20%
80%
0%
0%
0%
1,3-Dichloropropene
0.05
0.25
0.2
0.006%
100%
0%
0%
0%
Diesel Particulate Matter
1
0.0033
448
0%
0%
40%
60%
*
Ethylene Dibromide
0.01
0.0017
9
0.02%
0.01%
0%
0%
100%
Ethylene Dichloride
0.03
0.038
0.9
14%
2%
0%
0%
85%
Ethylene Oxide
0.01
0.011
1
9%
91%
0%
0%
0%
Formaldehyde
1
0.077
17
7%
3%
28%
13%
49%
Methyl Chloride
1
0.56
2
3%
0.2%
0%
0%
97%
Naphthalene
0.04
0.029
1.3
11%
59%
23%
6%
0%
Nickel Compounds
0.003
0.0064
0.4
69%
23%
1%
7%
0%
Perchloroethylene
0.09
0.17
0.5
0.03%
30%
0%
0%
70%
1,1,2,2-Tetrachloroethane
0.04
0.017
2
0%
0.5%
0%
0%
99%
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.
