ESSEX
COUNTY
ESSEX 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 |
2.3 |
0.45 |
5.2 |
<1% |
6% |
9% |
4% |
81%* |
Acrolein |
0.092 |
0.020 |
4.6 |
<1% |
23% |
16% |
9% |
52%* |
Arsenic Compounds |
0.00056 |
0.00023 |
2.4 |
3% |
18% |
9% |
7% |
63% |
Benzene |
1.7 |
0.13 |
13 |
<1% |
12% |
42% |
14% |
32% |
1,3-Butadiene |
0.14 |
0.033 |
4.2 |
<1% |
<1% |
52% |
19% |
29% |
Cadmium Compounds |
0.00015 |
0.00024 |
0.6 |
16% |
51% |
0% |
<1% |
33% |
Carbon Tetrachloride |
0.61 |
0.067 |
9.1 |
0% |
<1% |
0% |
0% |
100% |
Chloroform |
0.18 |
0.043 |
4.2 |
<1% |
67% |
0% |
0% |
33% |
Chromium (hexavalent form) |
0.00028 |
0.000083 |
3.4 |
46% |
12% |
7% |
1% |
34% |
Cobalt Compounds |
0.00009 |
0.00011 |
0.8 |
88% |
12% |
0% |
0% |
0% |
1,4-Dichlorobenzene |
0.16 |
0.091 |
1.8 |
<1% |
71% |
0% |
0% |
29% |
1,3-Dichloropropene |
0.23 |
0.25 |
0.9 |
0% |
100% |
0% |
0% |
0% |
Diesel Particulate Matter |
1.6 |
0.0033 |
474 |
0% |
0% |
45% |
55% |
0% |
Ethylbenzene |
0.53 |
0.4 |
1.3 |
1% |
25% |
52% |
22% |
0% |
Ethylene Oxide |
0.0072 |
0.011 |
1.2 |
5% |
35% |
0% |
0% |
60% |
Formaldehyde |
2.6 |
0.077 |
34 |
<1% |
3% |
12% |
8% |
77%* |
Methyl Chloride |
1.2 |
0.56 |
2.2 |
<1% |
1% |
0% |
0% |
99% |
Naphthalene |
0.2 |
0.029 |
7 |
<1% |
49% |
31% |
4% |
16% |
Nickel Compounds |
0.0013 |
0.0021 |
0.6 |
40% |
45% |
4% |
4% |
7% |
PAH/POM |
0.013 |
0.0072** |
1.7 |
<1% |
71% |
13% |
16% |
0% |
Perchloroethylene |
0.35 |
0.17 |
2 |
<1% |
81% |
0% |
0% |
19% |
1,1,2-Trichloroethane |
0.000005 |
0.063 |
7.9E-5 |
60% |
40% |
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. |
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