Burlington 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
2
0.45
4
3%
5%
54%
9%
28%
Acrolein
0.2
0.020
8
0.5%
36%
49%
14%
0%
Arsenic Compounds
0.0001
0.00023
0.6
69%
31%
0%
0%
0%
Benzene
1
0.13
10
1%
10%
45%
13%
31%
Bis(2-ethylhexyl)phthalate
2
0.42
4
0.001%
0.2%
0%
0%
100%
1,3-Butadiene
0.1
0.033
4
0.08%
12%
32%
12%
44%
Cadmium Compounds
0.00008
0.00024
0.3
57%
42%
0%
0.9%
0%
Carbon Tetrachloride
0.3
0.067
4
0.5%
0.3%
0%
0%
99%
Chloroform
0.1
0.043
2
2%
57%
0%
0%
41%
Chromium (hexavalent form)
0.0001
0.000083
1.7
32%
59%
8%
0.6%
0%
1,4-Dichlorobenzene
0.05
0.091
0.5
0.1%
100%
0%
0%
0%
1,3-Dichloropropene
0.09
0.25
0.4
0.0004%
100%
0%
0%
0%
Diesel Particulate Matter
2
0.0033
545
0%
0%
40%
60%
*
Ethylene Dibromide
0.03
0.0017
15
0.02%
0.004%
0%
0%
100%
Ethylene Dichloride
0.04
0.038
1.1
4%
0.8%
0%
0%
95%
Ethylene Oxide
0.002
0.011
0.2
12%
88%
0%
0%
0%
Formaldehyde
2
0.077
25
0.8%
12%
32%
13%
42%
Methyl Chloride
1
0.56
2
1%
1%
0%
0%
98%
Naphthalene
0.06
0.029
1.9
10%
55%
28%
7%
0%
Nickel Compounds
0.004
0.0064
0.6
53%
41%
1%
4%
0%
Perchloroethylene
0.2
0.17
1
0.8%
35%
0%
0%
64%
1,1,2,2-Tetrachloroethane
0.06
0.017
4
0.6%
0.9%
0%
0%
98%
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.
