BURLINGTON 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
1.8
0.45
4
<1%
4%
2%
1%
93%*
Acrolein
0.045
0.020
2.2
<1%
19%
11%
7%
63%*
Arsenic Compounds
0.00044
0.00023
1.9
4%
8%
4%
3%
81%
Benzene
0.94
0.13
7.2
1%
11%
21%
9%
58%
1,3-Butadiene
0.072
0.033
2.2
<1%
<1%
32%
13%
55%
Cadmium Compounds
0.000082
0.00024
0.3
10%
34%
0%
<1%
56%
Carbon Tetrachloride
0.61
0.067
9.1
0%
<1%
0%
0%
100%
Chloroform
0.12
0.043
2.7
1%
49%
0%
0%
50%
Chromium (hexavalent form)
0.00015
0.000083
1.8
28%
4%
4%
<1%
64%
Cobalt Compounds
0.000018
0.00011
0.2
100%
<1%
0%
0%
0%
1,4-Dichlorobenzene
0.078
0.091
0.8
<1%
41%
0%
0%
59%
1,3-Dichloropropene
0.06
0.25
0.2
0%
100%
0%
0%
0%
Diesel Particulate Matter
.72
0.0033
220
0%
0%
56%
44%
0%
Ethylbenzene
0.15
0.4
0.4
2%
12%
56%
30%
0%
Ethylene Oxide
0.0085
0.011
0.8
9%
23%
0%
0%
68%
Formaldehyde
2.1
0.077
27
<1%
2%
6%
3%
89%*
Methyl Chloride
1.2
0.56
2.2
0%
<1%
0%
0%
100%
Naphthalene
0.07
0.029
2.4
1%
37%
24%
4%
34%
Nickel Compounds
0.00065
0.
0.3
66%
11%
3%
5%
15%
PAH/POM
0.011
0.0072**
1.6
1%
86%
6%
7%
0%
Perchloroethylene
0.11
0.17
0.7
1%
41%
0%
0%
58%
1,1,2-Trichloroethane
0.00066
0.063
0.1
<1%
100%
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.
