Camden 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
0.07%
3%
38%
11%
48%
Acrolein
0.09
0.020
4
0.3%
13%
66%
21%
0%
Arsenic Compounds
0.0007
0.00023
3
2%
6%
5%
9%
78%
Benzene
2
0.13
14
1%
11%
33%
10%
45%
1,3-Butadiene
0.1
0.033
3
1%
0.04%
41%
15%
43%
Cadmium Compounds
0.0001
0.00024
0.4
16%
33%
0%
3%
48%
Carbon Tetrachloride
0.6
0.0679
9
0.007%
0.1%
0%
0%
99%
Chloroform
0.1
0.043
3
1%
46%
0%
0%
53%
Chromium (hexavalent form)
0.0003
0.000083
4
7%
5%
4%
1%
83%
1,4-Dichlorobenzene
0.01
0.091
1.4
0.1%
34%
0%
0%
66%
1,3-Dichloropropene
0.08
0.25
0.3
0.002%
100%
0%
0%
0%
Diesel Particulate Matter
2
0.0033
561
0%
0%
27%
73%
*
Ethylbenzene
0.03
0.4
0.9
2%
6%
68%
24%
0%
Ethylene Oxide
0.009
0.011
0.8
6%
17%
0%
0%
77%
Formaldehyde
2
0.077
27
1%
2%
22%
15%
60%
Methyl Chloride
1
0.56
2
0.002%
0.5%
0%
0%
99.5%
Methyl tert-butyl ether
2
3.8
0.5
2%
14%
43%
41%
0%
Naphthalene
0.08
0.029
3
5%
41%
19%
5%
30%
PAH/POM
0.02
0.0075
2
7%
71%
13%
9%
0%
Perchloroethylene
0.3
0.17
1.8
0.4%
28%
0%
0%
72%
1,1,2-Trichloroethane
0.02
0.063
0.4
0.00006%
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.
