CAPE MAY County Average 2005 NATA Modeled Air Concentrations Compared to Health Benchmarks
Pollutant
Modeled
Air Concentration (ug/m3)
Health
Benchmark (ug/m3)
Risk
Ratio
%
Contribution from
Point Sources
Nonpoint
Sources
On-road
Mobile Sources
Nonroad
Mobile Sources
Background & Secondary
Acetaldehyde
1.2
0.45
2.8
0%
2%
<1%
1%
97%*
Acrolein
0.019
0.020
1
<1%
16%
4%
9%
71%*
Arsenic Compounds
0.00038
0.00023
1.6
1%
2%
1%
2%
94%
Benzene
0.67
0.13
5.2
1%
6%
5%
7%
81%
1,3-Butadiene
0.045
0.033
1.4
0%
<1%
5%
6%
89%
Cadmium Compounds
0.000048
0.00024
0.2
1%
14%
0%
<1%
85%
Carbon Tetrachloride
0.61
0.067
9.1
0%
<1%
0%
0%
100%
Chloroform
0.064
0.043
1.5
0%
9%
0%
0%
91%
Chromium (hexavalent form)
0.0001
0.000083
1.2
2%
2%
1%
<1%
95%
Cobalt Compounds
0.0000056
0.00011
0.05
100%
<1%
0%
0%
0%
1,4-Dichlorobenzene
0.061
0.091
0.7
<1%
24%
0%
0%
76%
1,3-Dichloropropene
0.027
0.25
0.1
0%
100%
0%
0%
0%
Diesel Particulate Matter
0.13
0.0033
41
0%
0%
19%
81%
0%
Ethylbenzene
0.052
0.4
0.1
8%
13%
24%
55%
0%
Ethylene Oxide
0.0058
0.011
0.5
<1%
6%
0%
0%
94%
Formaldehyde
1.3
0.077
17
0%
2%
1%
2%
95%*
Methyl Chloride
1.2
0.56
2.1
0%
<1%
0%
0%
100%
Naphthalene
0.027
0.029
0.9
1%
44%
9%
5%
41%
Nickel Compounds
0.00017
0.0021
0.1
11%
19%
2%
11%
57%
PAH/POM
0.0074
0.0072**
1
<1%
94%
1%
5%
0%
Perchloroethylene
0.084
0.17
0.5
<1%
22%
0%
0%
78%
1,1,2-Trichloroethane
0.0085
0.063
0.1
0%
100%
0%
0%
0%
Chemicals with risk ratios greater than or equal to 1 are
in bold.
Risk Ratios based on noncarcinogenic effects are in italics.
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. *Acetaldehyde, acrolein and formaldehyde concentration estimates include secondary formation, which is the process by which chemicals in the air are transformed into other chemicals.
**PAH/POM is "polycyclic aromatic hydrocarbons/polycyclic organic matter." These define a broad class of compounds. The chemicals making up this class were broken up into 8 groups based on toxicity, and each group was assigned a cancer-weighted toxicity estimate. 0.0072 ug/m3 is the health benchmark average across the 8 groups.
