Gloucester 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
2
0.45
4
4%
3%
48%
13%
31%
Acrolein
0.1
0.020
5
1%
17%
55%
27%
0%
Arsenic Compounds
0.0003
0.00023
1.3
88%
12%
0%
0%
0%
Benzene
1
0.13
9
6%
5%
42%
14%
33%
Bis(2-ethylhexyl)phthalate
2
0.42
4
0.002%
0.1%
0%
0%
100%
1,3-Butadiene
0.09
0.033
3
1%
1%
36%
17%
45%
Cadmium Compounds
0.0001
0.00024
0.5
69%
29%
0%
2%
0%
Carbon Tetrachloride
0.3
0.067
4
0.6%
0.2%
0%
0%
99%
Chloroform
0.07
0.043
1.7
5%
40%
0%
0%
55%
Chromium (hexavalent form)
0.0002
0.000083
3
19%
76%
4%
0.8%
0%
1,4-Dichlorobenzene
0.04
0.091
0.4
3%
97%
0%
0%
0%
1,3-Dichloropropene
0.07
0.25
0.3
0.002%
100%
0%
0%
0%
Diesel Particulate Matter
2
0.0033
607
0%
0%
31%
69%
*
Ethylene Dibromide
0.02
0.0017
13
0.05%
0.004%
0%
0%
100%
Ethylene Dichloride
0.04
0.038
1
9%
2%
0%
0%
90%
Ethylene Oxide
0.005
0.011
0.4
12%
88%
0%
0%
0%
Formaldehyde
2
0.077
22
2%
5%
30%
19%
44%
Methyl Chloride
1
0.56
2
1%
0.5%
0%
0%
99%
Naphthalene
0.06
0.029
2
16%
53%
21%
10%
0%
Nickel Compounds
0.007
0.0064
1
82%
10%
1%
7%
0%
Perchloroethylene
0.2
0.17
0.9
0.1%
41%
0%
0%
59%
1,1,2,2-Tetrachloroethane
0.05
0.017
3
0.02%
0.6%
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.
