Bergen 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
3
0.45
6
0.05%
5%
51%
10%
34%
Acrolein
0.16
0.020
8
0.3%
12%
67%
21%
0%
Arsenic Compounds
0.0006
0.00023
3
2%
17%
11%
8%
62%
Benzene
2
0.13
18
0.2%
11%
50%
16%
23%
1,3-Butadiene
0.2
0.033
5
1%
0.03%
52%
24%
23%
Cadmium Compounds
0.0001
0.00024
0.5
5%
57%
0%
1%
37%
Carbon Tetrachloride
0.6
0.067
9
0.0003%
0.3%
0%
0%
99.7%
Chloroform
0.2
0.043
5
0.2%
70%
0%
0%
30%
Chromium (hexavalent form)
0.0003
0.000083
3
38%
18%
8%
1%
35%
1,4-Dichlorobenzene
0.01
0.091
1.6
0.3%
68%
0%
0%
32%
1,3-Dichloropropene
0.02
0.25
0.8
0.00004%
100%
0%
0%
0%
Diesel Particulate Matter
2
0.0033
500
0%
0%
29%
71%
*
Ethylbenzene
0.8
0.40
2
1%
15%
59%
25%
0%
Ethylene Oxide
0.01
0.011
1
12%
22%
0%
0%
66%
Formaldehyde
3
0.077
33
0.3%
3%
33%
15%
49%
Methyl Chloride
1
0.56
2
0.02%
1%
0%
0%
99%
Methyl tert-butyl ether
4
3.8
1
0.2
12%
39%
49%
0%
Naphthalene
0.2
0.029
6
2%
60%
15%
3%
20%
PAH/POM
0.02
0.0075
2
3%
71%
16%
10%
0%
Perchloroethylene
0.3
0.17
1.9
1%
79%
0%
0%
20%
1,1,2-Trichloroethane
0.0000021
0.063
3.0E-5
36%
64%
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.
