Sussex County Average 2002 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
3
0.005%
2%
21%
5%
72%
Acrolein
0.03
0.020
1.6
0.04%
8%
73%
19%
0%
Arsenic Compounds
0.0004
0.00023
1.8
4%
5%
3%
2%
86%
Benzene
0.9
0.13
7
0.04%
8%
23%
9%
60%
1,3-Butadiene
0.06
0.033
1.7
0.1%
0.02%
20%
11%
69%
Cadmium Compounds
0.00007
0.00024
0.3
1%
24%
0%
0.05%
75%
Carbon Tetrachloride
0.6
0.067
9
0.00007%
0.03%
0%
0%
99.9%
Chloroform
0.07
0.043
1.6
0.002%
17%
0%
0%
83%
Chromium (hexavalent form)
0.0001
0.000083
1.3
3%
4%
4%
0.3%
89%
1,4-Dichlorobenzene
0.06
0.091
0.7
0.007%
24%
0%
0%
76%
1,3-Dichloropropene
0.03
0.25
0.1
0%
100%
0%
0%
0%
Diesel Particulate Matter
1
0.0033
307
0%
0%
33%
67%
*
Ethylbenzene
0.1
0.4
0.3
0.2%
5%
65%
30%
0%
Ethylene Oxide
0.008
0.011
0.7
1%
3%
0%
0%
96%
Formaldehyde
2
0.077
20
0.02%
2%
11%
4%
83%
Methyl Chloride
1
0.56
2
0.001%
0.1%
0%
0%
99.9%
Methyl tert-butyl ether
0.7
3.8
0.2
0.002%
11%
31%
58%
0%
Naphthalene
0.04
0.029
1.5
1%
29%
10%
1%
59%
PAH/POM
0.005
0.0075
0.7
1%
85%
9%
5%
0%
Perchloroethylene
0.08
0.17
0.5
0.1%
22%
0%
0%
78%
1,1,2-Trichloroethane
2.7E-7
0.063
4.2E-6
42%
58%
0%
0%
0%
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.
