|
MIDDLESEX
COUNTY
| Middlesex
County Average 1996 NATA Modeled Air Concentrations
Compared to Health Benchmarks |
| Pollutant |
Modeled
Air Concentration (ug/m3) |
Health
Benchmark (ug/m3) |
Risk
Ratio |
%
Contribution by Source Category |
| Point |
Area |
Onroad
Mobile |
Nonroad
Mobile |
Background |
| Acetaldehyde |
1.1 |
0.45 |
2 |
0.02% |
12% |
50% |
37% |
0% |
| Acrolein |
0.14 |
0.02 |
7 |
0.01% |
8% |
53% |
38% |
0% |
| Acrylonitrile |
0.0033 |
0.015 |
0.2 |
85% |
15% |
0% |
0% |
0% |
| Arsenic
compounds |
0.000078 |
0.00023 |
0.3 |
12% |
87% |
1% |
0.05% |
0% |
| Benzene |
1.4 |
0.13 |
11 |
4% |
3% |
39% |
20% |
34% |
| Beryllium
compounds |
0.000017 |
0.00042 |
0.04 |
2% |
98% |
0% |
0.0001% |
0% |
| 1,3-Butadiene |
0.052 |
0.0036 |
15 |
0.01% |
1% |
83% |
16% |
0% |
| Cadmium
compounds |
0.00014 |
0.00029 |
0.5 |
5% |
95% |
0% |
0.0002% |
0% |
| Carbon
tetrachloride |
0.88 |
0.067 |
13 |
0.001% |
0.1% |
0% |
0% |
100% |
| Chloroform |
0.11 |
0.043 |
2 |
1% |
22% |
0% |
0% |
78% |
| Chromium
compounds |
0.0015 |
0.00025 |
6 |
19% |
67% |
4% |
10% |
0% |
| Coke
oven emissions |
0 |
0.0016 |
0 |
0% |
0% |
0% |
0% |
0% |
| 1,3-Dichloropropene |
0.12 |
0.25 |
0.5 |
0% |
100% |
0% |
0% |
0% |
| Diesel
particulate matter |
3.7 |
0.5 |
7 |
0% |
0% |
27% |
73% |
*** |
| Ethylene
dibromide |
0.0077 |
0.0045 |
2 |
0.02% |
0.03% |
0% |
0% |
100% |
| Ethylene
dichloride |
0.062 |
0.038 |
2 |
1% |
0.2% |
0% |
0% |
99% |
| Ethylene
oxide |
0.015 |
0.011 |
1 |
50% |
50% |
0% |
0% |
0% |
| Formaldehyde |
1.5 |
0.077 |
20 |
0.4% |
6% |
31% |
46% |
16% |
| Hexachlorobenzene |
0.000093 |
0.0022 |
0.04 |
0% |
0.2% |
0% |
0% |
100% |
| Hydrazine |
0.00020 |
0.0002 |
1 |
97% |
4% |
0% |
0% |
0% |
| Lead
compounds |
0.0092 |
0.1 |
0.09 |
1% |
64% |
1% |
34% |
0% |
| Manganese
compounds |
0.0043 |
0.05 |
0.09 |
1% |
95% |
1% |
4% |
0% |
| Mercury
compounds |
0.0024 |
0.3 |
0.01 |
2% |
33% |
0.04% |
2% |
63% |
| Methylene
chloride |
0.55 |
2.1 |
0.3 |
7% |
66% |
0% |
0% |
27% |
| Nickel
compounds |
0.0031 |
0.0032 |
1 |
2% |
94% |
2% |
2% |
0% |
| Perchloroethylene |
0.29 |
0.17 |
2 |
3% |
47% |
0% |
0% |
49% |
| Polychlorinated
biphenyls |
0.00038 |
0.01 |
0.04 |
0% |
0.002% |
0% |
0% |
100% |
| Polycyclic
organic matter |
0.11 |
0.018 |
6 |
7% |
93% |
0.3% |
0.1% |
0% |
| 7-PAH |
0.0052 |
0.0051 |
1 |
0.04% |
97% |
3% |
0.3% |
0% |
| Propylene
dichloride |
0.00021 |
0.053 |
0.004 |
81% |
18% |
0% |
0% |
0% |
| Quinoline |
0.0000029 |
0.00029 |
0.01 |
0% |
100% |
0% |
0% |
0% |
| 1,1,2,2-Tetrachloroethane |
0.0016 |
0.017 |
0.09 |
96% |
4% |
0% |
0% |
0% |
| Trichloroethylene |
0.15 |
0.5 |
0.3 |
6% |
38% |
0% |
0% |
56% |
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