MORRIS County Average 2005 NATA Modeled Air Concentrations Compared to Health Benchmarks
Pollutant
Modeled
Air Concentration (ug/m3)
Health
Benchmark (ug/m3)
Risk
Ratio
%
Contribution from
Point Sources
Nonpoint
Sources
On-road
Mobile Sources
Nonroad
Mobile Sources
Background & Secondary
Acetaldehyde
1.7
0.45
3.7
0%
3%
5%
2%
90%*
Acrolein
0.041
0.020
2
<1%
16%
13%
11%
60%*
Arsenic Compounds
0.00049
0.00023
2.1
3%
7%
4%
3%
83%
Benzene
0.91
0.13
7
<1%
8%
29%
14%
49%
1,3-Butadiene
0.073
0.033
2.2
0%
0%
30%
15%
55%
Cadmium Compounds
0.000087
0.00024
0.4
6%
32%
0%
<1%
62%
Carbon Tetrachloride
0.61
0.067
9.1
0%
<1%
0%
0%
100%
Chloroform
0.096
0.043
2.2
<1%
38%
0%
0%
62%
Chromium (hexavalent form)
0.00025
0.000083
3
10%
4%
3%
<1%
83%
Cobalt Compounds
0.00014
0.00011
1.3
99%
1%
0%
0%
0%
1,4-Dichlorobenzene
0.082
0.091
0.9
<1%
44%
0%
0%
56%
1,3-Dichloropropene
0.069
0.25
0.3
0%
100%
0%
0%
0%
Diesel Particulate Matter
0.53
0.0033
161
0%
0%
56%
44%
0%
Ethylbenzene
0.19
0.4
0.5
<1%
15%
51%
34%
0%
Ethylene Oxide
0.0088
0.011
0.8
1%
11%
0%
0%
88%
Formaldehyde
1.8
0.077
24
<1%
3%
7%
4%
86%*
Methyl Chloride
1.2
0.56
2.1
<1%
<1%
0%
0%
100%
Naphthalene
0.086
0.029
3
<1%
33%
27%
5%
35%
Nickel Compounds
0.0010
0.0021
0.5
39%
13%
2%
1%
45%
PAH/POM
0.0078
0.0072**
1.1
<1%
79%
8%
13%
0%
Perchloroethylene
0.16
0.17
0.9
<1%
39%
0%
0%
61%
1,1,2-Trichloroethane
9.3E-7
0.063
2.0E-5
53%
47%
0%
0%
0%
Chemicals with risk ratios greater than or equal to 1 are
in bold.
Risk Ratios based on noncarcinogenic effects are in italics.
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. *Acetaldehyde, acrolein and formaldehyde concentration estimates include secondary formation, which is the process by which chemicals in the air are transformed into other chemicals.
**PAH/POM is "polycyclic aromatic hydrocarbons/polycyclic organic matter." These define a broad class of compounds. The chemicals making up this class were broken up into 8 groups based on toxicity, and each group was assigned a cancer-weighted toxicity estimate. 0.0072 ug/m3 is the health benchmark average across the 8 groups.
