Atlantic 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
1
0.45
2
0.9%
4%
30%
13%
52%
Acrolein
0.06
0.020
3
0.08%
39%
39%
22%
0%
Arsenic Compounds
0.0009
0.00023
4
98%
2%
0%
0%
0%
Benzene
0.9
0.13
7
0.06%
8%
27%
22%
44%
Bis(2-ethylhexyl)phthalate
2
0.42
4
0.0003%
0.003%
0%
0%
100%
1,3-Butadiene
0.1
0.033
3
0.005%
4%
25%
17%
54%
Cadmium Compounds
0.00002
0.00024
0.1
18%
82%
0%
0.1%
0%
Carbon Tetrachloride
0.3
0.067
4
0.02%
0.1%
0%
0%
100%
Chloroform
0.06
0.043
1.4
0.04%
32%
0%
0%
67%
Chromium (hexavalent form)
0.00002
0.000083
0.2
23%
51%
23%
2%
0%
1,4-Dichlorobenzene
0.03
0.091
0.3
0%
100%
0%
0%
0%
1,3-Dichloropropene
0.06
0.25
0.2
0%
100%
0%
0%
0%
Diesel Particulate Matter
1
0.0033
314
0%
0%
44%
56%
*
Ethylene Dibromide
0.03
0.0017
15
0%
0.001%
0%
0%
100%
Ethylene Dichloride
0.04
0.038
1
0.03%
0.1%
0%
0%
100%
Ethylene Oxide
0.0009
0.011
0.1
0%
100%
0%
0%
0%
Formaldehyde
1
0.077
16
0.2%
8%
18%
8%
66%
Methyl Chloride
1
0.56
2
0.003%
0.5%
0%
0%
99%
Naphthalene
0.03
0.029
0.9
0.3%
66%
27%
7%
0%
Nickel Compounds
0.001
0.0064
0.2
81%
17%
2%
0.8%
0%
Perchloroethylene
0.1
0.17
0.9
0.003%
26%
0%
0%
74%
1,1,2,2-Tetrachloroethane
0.06
0.017
3
0%
0.4%
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.
