PASSAIC 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
2.1
0.45
4.7
0%
5%
9%
3%
83%*
Acrolein
0.078
0.020
3.9
<1%
25%
16%
9%
50%*
Arsenic Compounds
0.00051
0.00023
2.2
2%
15%
8%
6%
69%
Benzene
1.6
0.13
12
<1%
9%
40%
16%
35%
1,3-Butadiene
0.12
0.033
3.7
0%
<1%
48%
20%
32%
Cadmium Compounds
0.00011
0.00024
0.5
6%
50%
0%
<1%
44%
Carbon Tetrachloride
0.61
0.067
9.1
0%
<1%
0%
0%
100%
Chloroform
0.14
0.043
3.4
<1%
59%
0%
0%
41%
Chromium (hexavalent form)
0.00028
0.000083
3.4
51%
8%
6%
<1%
35%
Cobalt Compounds
0.00022
0.00011
2
97%
3%
0%
0%
0%
1,4-Dichlorobenzene
0.16
0.091
1.8
<1%
72%
0%
0%
28%
1,3-Dichloropropene
0.23
0.25
0.9
0%
100%
0%
0%
0%
Diesel Particulate Matter
1.2
0.0033
376
0%
0%
51%
49%
0%
Ethylbenzene
0.43
0.4
1.1
2%
17%
52%
29%
0%
Ethylene Oxide
0.011
0.011
1
2%
28%
0%
0%
70%
Formaldehyde
2.3
0.077
30
<1%
3%
12%
7%
78%*
Methyl Chloride
1.2
0.56
2.2
<1%
1%
0%
0%
99%
Naphthalene
0.18
0.029
6.2
<1%
50%
30%
3%
17%
Nickel Compounds
0.00080
0.0021
0.4
35%
45%
5%
2%
13%
PAH/POM
0.014
0.0072**
1.7
<1%
77%
11%
12%
0%
Perchloroethylene
0.29
0.17
1.7
<1%
78%
0%
0%
22%
1,1,2-Trichloroethane
2.6E-6
0.063
4.1E-5
48%
52%
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.
