Monmouth 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
0.01%
3%
34%
8%
55%
Acrolein
0.06
0.020
3
0.09%
11%
70%
19%
0%
Arsenic Compounds
0.0004
0.00023
1.9
1%
6%
6%
5%
82%
Benzene
1
0.13
10
.02%
12%
35%
12%
41%
1,3-Butadiene
0.09
0.033
3
0.3%
0.01%
37%
17%
46%
Cadmium Compounds
0.00007
0.00024
0.3
3%
30%
0%
0.4%
67%
Carbon Tetrachloride
0.6
0.067
9
0.0002%
0.09%
0%
0%
99.9%
Chloroform
0.1
0.043
3
0.4%
46%
0%
0%
54%
Chromium (hexavalent form)
0.0001
0.000083
1.5
6%
9%
8%
1%
76%
1,4-Dichlorobenzene
0.08
0.091
0.9
0.2%
45%
0%
0%
55%
1,3-Dichloropropene
0.07
0.25
0.3
0.00006%
100%
0%
0%
0%
Diesel Particulate Matter
1
0.0033
374
0%
0%
30%
70%
*
Ethylbenzene
0.3
0.4
0.8
2%
19%
58%
22%
0%
Ethylene Oxide
0.009
0.011
0.8
2%
12%
0%
0%
86%
Formaldehyde
2
0.077
23
0.08%
2%
20%
8%
70%
Methyl Chloride
1
0.56
2
0.01%
0.3%
0%
0%
99.7%
Methyl tert-butyl ether
2
3.8
0.4
1%
11%
37%
51%
0%
Naphthalene
0.08
0.029
3
2%
48%
12%
2%
36%
PAH/POM
0.01
0.0075
1.3
1%
81%
11%
7%
0%
Perchloroethylene
0.1
0.17
0.8
1%
42%
0%
0%
57%
1,1,2-Trichloroethane
1.4E-6
0.063
2.0E-5
66%
34%
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.
