Gloucester 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
2
0.45
4
0.1%
3%
34%
10%
53%
Acrolein
0.07
0.020
3
0.4%
12%
66%
22%
0%
Arsenic Compounds
0.0005
0.00023
2
3%
6%
5%
10%
76%
Benzene
1
0.13
10
2%
17%
30%
11%
40%
1,3-Butadiene
0.08
0.033
2
2%
0.05%
31%
16%
51%
Cadmium Compounds
0.00008
0.00024
0.4
13%
26%
0%
3%
58%
Carbon Tetrachloride
0.6
0.067
9
0.0005%
0.1%
0%
0%
100%
Chloroform
0.09
0.043
2
0.7%
33%
0%
0%
67%
Chromium (hexavalent form)
0.0001
0.000083
1.6
11%
6%
7%
3%
73%
1,4-Dichlorobenzene
0.07
0.091
0.8
0.3%
37%
0%
0%
63%
1,3-Dichloropropene
0.05
0.25
0.2
0.004%
100%
0%
0%
0%
Diesel Particulate Matter
1
0.0033
397
0%
0%
30%
70%
*
Ethylbenzene
0.2
0.4
0.6
2%
7%
64%
27%
0%
Ethylene Oxide
0.009
0.011
0.8
6%
12%
0%
0%
82%
Formaldehyde
2
0.077
24
1%
2%
19%
12%
66%
Methyl Chloride
1
0.56
2
0.003%
0.3%
0%
0%
99.7%
Methyl tert-butyl ether
2
3.8
0.4
2%
13%
38%
47%
0%
Naphthalene
0.06
0.029
2
7%
34%
16%
5%
38%
PAH/POM
0.01
0.0075
1.8
14%
69%
9%
8%
0%
Perchloroethylene
0.4
0.17
0.7
1%
48%
0%
0%
51%
1,1,2-Trichloroethane
0.06
0.063
0.9
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.
