Morris 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
2
0.45
4
0.02%
3%
37%
7%
53%
Acrolein
0.07
0.020
4
0.2%
9%
70%
21%
0%
Arsenic Compounds
0.0005
0.00023
2
3%
7%
5%
4%
81%
Benzene
1
0.13
10
0.2%
9%
40%
15%
36%
1,3-Butadiene
0.09
0.033
3
0.5%
0.009%
38%
19%
43%
Cadmium Compounds
0.00009
0.00024
0.4
5%
33%
0%
0.3%
62%
Carbon Tetrachloride
0.6
0.067
9
0.0001%
0.08%
0%
0%
99.9%
Chloroform
0.1
0.043
2
0.07%
38%
0%
0%
62%
Chromium (hexavalent form)
0.0002
0.000083
3
8%
4%
4%
1%
83%
1,4-Dichlorobenzene
0.08
0.091
0.9
0.09%
44%
0%
0%
56%
1,3-Dichloropropene
0.07
0.25
0.3
0.00003%
100%
0%
0%
0%
Diesel Particulate Matter
1
0.0033
346
0%
0%
35%
65%
*
Ethylbenzene
0.3
0.4
0.8
0.6%
9%
61%
30%
0%
Ethylene Oxide
0.009
0.011
0.8
2%
11%
0%
0%
87%
Formaldehyde
2
0.077
22
0.1%
3%
23%
9%
65%
Methyl Chloride
1
0.56
2
0.007%
0.3%
0%
0%
99.7%
Methyl tert-butyl ether
2
3.8
0.4
0.1%
11%
35%
54%
0%
Naphthalene
0.07
0.029
3
3%
39%
14%
3%
41%
PAH/POM
0.01
0.0075
1.1
4%
74%
14%
8%
0%
Perchloroethylene
0.2
0.17
1
0.2%
39%
0%
0%
61%
1,1,2-Trichloroethane
8.1E-7
0.063
1.0E-5
46%
54%
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.
