Monmouth 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
1%
3%
49%
10%
36%
Acrolein
0.1
0.020
5
0.08%
27%
55%
18%
0%
Arsenic Compounds
0.00004
0.00023
0.2
7%
93%
0%
0%
0%
Benzene
1
0.13
10
0.2%
6%
40%
17%
36%
Bis(2-ethylhexyl)phthalate
2
0.42
4
0.02%
0.2%
0%
0%
100%
1,3-Butadiene
0.1
0.033
4
0.01%
3%
26%
14%
57%
Cadmium Compounds
0.00003
0.00024
0.1
9%
91%
0%
0.2%
0%
Carbon Tetrachloride
0.3
0.067
4
0.005%
0.2%
0%
0%
100%
Chloroform
0.09
0.043
2
0.07%
54%
0%
0%
46%
Chromium (hexavalent form)
0.00004
0.000083
0.5
21%
59%
19%
0.9%
0%
1,4-Dichlorobenzene
0.04
0.091
0.5
5%
95%
0%
0%
0%
1,3-Dichloropropene
0.08
0.25
0.3
0%
100%
0%
0%
0%
Diesel Particulate Matter
2
0.0033
486
0%
0%
43%
57%
*
Ethylene Dibromide
0.03
0.0017
20
0.04%
0.005%
0%
0%
100%
Ethylene Dichloride
0.05
0.038
1.2
0.2%
0.1%
0%
0%
100%
Ethylene Oxide
0.003
0.011
0.3
42%
58%
0%
0%
0%
Formaldehyde
2
0.077
21
1%
4%
29%
11%
56%
Methyl Chloride
1
0.56
2
0.01%
0.4%
0%
0%
100%
Naphthalene
0.05
0.029
1.8
1%
70%
24%
5%
0%
Nickel Compounds
0.0005
0.0064
0.1
6%
86%
7%
0.9%
0%
Perchloroethylene
0.2
0.17
1.3
0.3%
35%
0%
0%
65%
1,1,2,2-Tetrachloroethane
0.07
0.017
4
0.2%
0.1%
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.
