Camden 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
5
4%
3%
55%
13%
26%
Acrolein
0.1
0.020
7
1%
20%
57%
21%
0%
Arsenic Compounds
0.0003
0.00023
1.3
83%
17%
0%
0%
0%
Benzene
2
0.13
12
3%
5%
52%
13%
27%
Bis(2-ethylhexyl)phthalate
2
0.42
4
0.002%
0.5%
0%
0%
99%
1,3-Butadiene
0.2
0.033
5
0.4%
2%
44%
12%
42%
Cadmium Compounds
0.0001
0.00024
0.6
59%
39%
0%
2%
0%
Carbon Tetrachloride
0.3
0.067
4
1%
0.3%
0%
0%
98%
Chloroform
0.1
0.043
2
5%
53%
0%
0%
42%
Chromium (hexavalent form)
0.00002
0.000083
2
29%
62%
8%
1%
0%
1,4-Dichlorobenzene
0.06
0.091
0.7
0.01%
100%
0%
0%
0%
1,3-Dichloropropene
0.1
0.25
0.5
0.001%
100%
0%
0%
0%
Diesel Particulate Matter
3
0.0033
774
0%
0%
31%
69%
*
Ethylene Dibromide
0.03
0.0017
18
0.04%
0.003%
0%
0%
100%
Ethylene Dichloride
0.05
0.038
1.2
6%
1%
0%
0%
92%
Ethylene Oxide
0.004
0.011
0.4
12%
88%
0%
0%
0%
Formaldehyde
2
0.077
28
1%
5%
35%
18%
40%
Methyl Chloride
1
0.56
2
1%
0.8%
0%
0%
98%
Naphthalene
0.08
0.029
3
10%
53%
28%
9%
0%
Nickel Compounds
0.007
0.0064
1.2
76%
14%
1%
9%
0%
Perchloroethylene
0.2
0.17
1.3
0.1%
43%
0%
0%
56%
1,1,2,2-Tetrachloroethane
0.07
0.017
4
0.08%
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.
