Bergen 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
3
0.45
6
2%
4%
63%
12%
20%
Acrolein
0.03
0.020
13
0.03%
32%
51%
17%
0%
Arsenic Compounds
0.0001
0.00023
0.5
4%
96%
0%
0%
0%
Benzene
2
0.13
18
0.1%
9%
53%
19%
19%
Bis(2-ethylhexyl)phthalate
2
0.42
4
0.1%
0.002%
0%
0%
100%
1,3-Butadiene
0.2
0.033
7
0.003%
8%
41%
20%
31%
Cadmium Compounds
0.00008
0.00024
0.3
7%
93%
0%
0.7%
0%
Carbon Tetrachloride
0.3
0.067
4
0.004%
0.6%
0%
0%
99%
Chloroform
0.2
0.043
4
0.2%
76%
0%
0%
24%
Chromium (hexavalent form)
0.0002
0.000083
2
2%
85%
12%
0.6%
0%
1,4-Dichlorobenzene
0.01
0.091
1.2
1%
99%
0%
0%
0%
1,3-Dichloropropene
0.02
0.25
0.8
0%
100%
0%
0%
0%
Diesel Particulate Matter
2
0.0033
670
0%
0%
41%
59%
*
Ethylene Dibromide
0.03
0.0017
19
.03%
0.02%
0%
0%
100%
Ethylene Dichloride
0.05
0.038
1.2
0.2%
0.4%
0%
0%
99%
Ethylene Oxide
0.008
0.011
0.7
0.3%
100%
0%
0%
0%
Formaldehyde
3
0.077
34
2%
4%
43%
17%
35%
Methyl Chloride
1
0.56
2
0.08%
0.8%
0%
0%
99%
Naphthalene
0.1
0.029
5
0.2%
72%
21%
6%
0%
Nickel Compounds
0.002
0.0064
0.3
2%
94%
4%
0.5%
0%
Perchloroethylene
0.4
0.17
2
0.2%
64%
0%
0%
36%
1,1,2,2-Tetrachloroethane
0.07
0.017
4
0.09%
0.6%
0%
0%
99%
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.
