Atlantic 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
1.4
0.45
3
0%
2%
2%
1%
95%*
Acrolein
0.026
0.020
1.3
<1%
19%
10%
7%
64%*
Arsenic Compounds
0.00018
0.00023
0.8
3%
10%
5%
10%
72%
Benzene
0.79
0.13
6.1
<1%
6%
16%
9%
69%
1,3-Butadiene
0.052
0.033
1.6
0%
0%
17%
7%
76%
Cadmium Compounds
0.000059
0.00024
0.2
2%
24%
0%
03%
71%
Carbon Tetrachloride
0.61
0.067
9.1
0%
<1%
0%
0%
100%
Chloroform
0.079
0.043
1.8
<1%
25%
0%
0%
75%
Chromium (hexavalent form)
0.000027
0.000083
0.3
18%
12%
13%
5%
52%
Cobalt Compounds
0.000026
0.00011
0.2
100%
<1%
0%
0%
0%
1,4-Dichlorobenzene
0.075
0.091
0.8
<1%
39%
0%
0%
61%
1,3-Dichloropropene
0.055
0.25
0.2
0%
100%
0%
0%
0%
Diesel Particulate Matter
0.23
0.0033
71
0%
0%
41%
59%
0%
Ethylbenzene
0.086
0.4
0.2
<1%
13%
53%
34%
0%
Ethylene Oxide
0.0071
0.011
0.6
<1%
13%
0%
0%
87%
Formaldehyde
1.5
0.077
20
0%
2%
4%
2%
92%*
Methyl Chloride
1.2
0.56
2.1
0%
<1%
0%
0%
100%
Naphthalene
0.047
0.029
1.6
<1%
43%
20%
3%
34%
Nickel Compounds
0.00043
0.0021
0.2
7%
14%
2%
67%
10%
PAH/POM
0.006
0.0072**
0.9
<1%
88%
5%
7%
0%
Perchloroethylene
0.10
0.17
0.6
<1%
34%
0%
0%
66%
1,1,2-Trichloroethane
3.4E-7
0.063
5.2E-6
<1%
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.
