MONMOUTH 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
1.6
0.45
3.6
<1%
2%
4%
2%
92%*
Acrolein
0.039
0.020
2
<1%
18%
11%
8%
63%*
Arsenic Compounds
0.00042
0.00023
1.8
1%
6%
4%
4%
85%
Benzene
0.97
0.13
7.5
<1%
12%
21%
11%
56%
1,3-Butadiene
0.069
0.033
2.1
<1%
<1%
28%
14%
58%
Cadmium Compounds
0.000071
0.00024
0.3
4%
30%
0%
<1%
66%
Carbon Tetrachloride
0.61
0.067
9.1
0%
<1%
0%
0%
100%
Chloroform
0.11
0.043
2.6
<1%
46%
0%
0%
54%
Chromium (hexavalent form)
0.00013
0.000083
1.5
11%
8%
4%
1%
76%
Cobalt Compounds
0.000013
0.00011
0.1
76%
24%
0%
0%
0%
1,4-Dichlorobenzene
0.083
0.091
0.9
<1%
45%
0%
0%
55%
1,3-Dichloropropene
0.075
0.25
0.3
0%
100%
0%
0%
0%
Diesel Particulate Matter
0.52
0.0033
157
0%
0%
46%
54%
0%
Ethylbenzene
0.39
0.4
0.5
1%
30%
41%
28%
0%
Ethylene Oxide
0.0086
0.011
0.8
4%
12%
0%
0%
84%
Formaldehyde
1.8
0.077
23
<1%
2%
5%
4%
89%*
Methyl Chloride
1.2
0.56
2.2
<1%
<1%
0%
0%
100%
Naphthalene
0.086
0.029
3
1%
43%
21%
3%
32%
Nickel Compounds
0.00046
0.0021
0.2
29%
36%
3%
10%
22%
PAH/POM
0.0091
0.0072**
1.3
<1%
86%
6%
8%
0%
Perchloroethylene
0.14
0.17
0.8
<1%
55%
0%
0%
45%
1,1,2-Trichloroethane
3.0E-6
0.063
5.0E-5
84%
16%
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.
