Warren 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
0.2%
3%
44%
6%
47%
Acrolein
0.06
0.020
3
0.007%
18%
68%
13%
0%
Arsenic Compounds
0.0001
0.00023
0.5
78%
22%
0%
0%
0%
Benzene
0.9
0.13
7
0.4%
11%
41%
10%
39%
Bis(2-ethylhexyl)phthalate
2
0.42
4
0.003%
0%
0%
0%
100%
1,3-Butadiene
0.06
0.033
1.9
0%
3%
48%
13%
36%
Cadmium Compounds
0.0005
0.00024
2
97%
3%
0%
0.04%
0%
Carbon Tetrachloride
0.3
0.067
4
0.0004%
0.1%
0%
0%
100%
Chloroform
0.1
0.043
3
57%
13%
0%
0%
30%
Chromium (hexavalent form)
0.0005
0.000083
5
0.7%
98%
1%
0.05%
0%
1,4-Dichlorobenzene
0.03
0.091
0.3
0.2%
100%
0%
0%
0%
1,3-Dichloropropene
0.05
0.25
0.2
0%
100%
0%
0%
0%
Diesel Particulate Matter
2
0.0033
464
0%
0%
48%
52%
*
Ethylene Dibromide
0.02
0.0017
9
0.002%
0.003%
0%
0%
100%
Ethylene Dichloride
0.03
0.038
0.8
0.3%
0.07%
0%
0%
100%
Ethylene Oxide
0.03
0.011
3
0%
100%
0%
0%
0%
Formaldehyde
1
0.077
14
0.2%
5%
29%
7%
59%
Methyl Chloride
1
0.56
2
0.01%
0.3%
0%
0%
100%
Naphthalene
0.03
0.029
1
0.8%
64%
31%
4%
0%
Nickel Compounds
0.0007
0.0064
0.1
14%
82%
4%
0.2%
0%
Perchloroethylene
0.1
0.17
0.6
1%
31%
0%
0%
68%
1,1,2,2-Tetrachloroethane
0.04
0.017
3
0.8%
0.08%
0%
0%
99%
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.
