Cape May 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
0.8
0.45
1.9
0.3%
2%
15%
22%
61%
Acrolein
0.03
0.020
1.6
0.2%
19%
31%
50%
0%
Arsenic Compounds
0.0005
0.00023
2
96%
4%
0%
0%
0%
Benzene
0.8
0.13
6
0.005%
5%
12%
36%
47%
Bis(2-ethylhexyl)phthalate
2
0.42
4
0.0001%
0%
0%
0%
100%
1,3-Butadiene
0.05
0.033
1.5
0.01%
1%
16%
35%
47%
Cadmium Compounds
0.00002
0.00024
0.1
11%
89%
0%
0.1%
0%
Carbon Tetrachloride
0.3
0.067
4
0%
0.06%
0%
0%
100%
Chloroform
0.04
0.043
1
0%
12%
0%
0%
88%
Chromium (hexavalent form)
0.00001
0.000083
0.1
24%
50%
20%
6%
0%
1,4-Dichlorobenzene
0.01
0.091
0.2
0%
100%
0%
0%
0%
1,3-Dichloropropene
0.03
0.25
0.1
0%
100%
0%
0%
0%
Diesel Particulate Matter
0.8
0.0033
248
0%
0%
41%
59%
*
Ethylene Dibromide
0.02
0.0017
10
0%
0.001%
0%
0%
100%
Ethylene Dichloride
0.03
0.038
0.8
0.004%
0.06%
0%
0%
100%
Ethylene Oxide
0.0004
0.011
0.04
0%
100%
0%
0%
0%
Formaldehyde
0.9
0.077
11
0.03%
3%
10%
11%
75%
Methyl Chloride
1
0.56
2
0.001%
0.2%
0%
0%
100%
Naphthalene
0.01
0.029
0.4
0.006%
71%
21%
9%
0%
Nickel Compounds
0.0004
0.0064
0.1
89%
8%
2%
2%
0%
Perchloroethylene
0.09
0.17
0.5
0.001%
20%
0%
0%
80%
1,1,2,2-Tetrachloroethane
0.04
0.017
3
0%
0.2%
0%
0%
100%
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.
