Morris 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
3
0.7%
4%
48%
10%
38%
Acrolein
0.09
0.020
4
0.04%
21%
59%
20%
0%
Arsenic Compounds
0.00005
0.00023
0.2
17%
83%
0%
0%
0%
Benzene
1
0.13
9
0.09%
5%
40%
18%
37%
Bis(2-ethylhexyl)phthalate
2
0.42
4
0.02%
0.004%
0%
0%
100%
1,3-Butadiene
0.1
0.033
3
0.002%
2%
31%
20%
48%
Cadmium Compounds
0.00003
0.00024
0.1
8%
92%
0%
0.5%
0%
Carbon Tetrachloride
0.3
0.067
4
0.001%
0.2%
0%
0%
100%
Chloroform
0.08
0.043
1.8
4%
45%
0%
0%
51%
Chromium (hexavalent form)
0.00007
0.000083
0.8
6%
82%
12%
0.7%
0%
1,4-Dichlorobenzene
0.04
0.091
0.4
1%
99%
0%
0%
0%
1,3-Dichloropropene
0.07
0.25
0.3
0%
100%
0%
0%
0%
Diesel Particulate Matter
1
0.0033
442
0%
0%
46%
54%
*
Ethylene Dibromide
0.02
0.0017
15
0.01%
0.007%
0%
0%
100%
Ethylene Dichloride
0.04
0.038
1
0.4%
0.2%
0%
0%
99%
Ethylene Oxide
0.002
0.011
0.2
14%
86%
0%
0%
0%
Formaldehyde
1
0.077
19
0.5%
4%
30%
12%
53%
Methyl Chloride
1
0.56
2
0.007%
0.3%
0%
0%
100%
Naphthalene
0.04
0.029
1.5
0.2%
65%
26%
8%
0%
Nickel Compounds
0.002
0.0064
0.3
2%
97%
2%
0.2%
0%
Perchloroethylene
0.2
0.17
1
0.09%
39%
0%
0%
61%
1,1,2,2-Tetrachloroethane
0.06
0.017
3
0.05%
0.2%
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.
