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Table 1 Distributional characteristics of hazardous air pollutants (μg/m 3 ) based on the 1999 U.S. EPA ASPEN Model, Texas

From: Air toxics and birth defects: a Bayesian hierarchical approach to evaluate multiple pollutants and spina bifida

Pollutant Mean Median 5thpercentile 25thpercentile 75thpercentile 95thpercentile
Acetaldehyde 1.50 1.45 0.62 0.86 1.93 2.97
Acrolein 0.11 0.09 0.01 0.04 0.14 0.32
Acrylonitrile 4.08 × 10-03 1.80 × 10-04 4.18 × 10-06 4.00 × 10-05 7.80 × 10-04 2.41 × 10-02
Arsenic compounds 6.00 × 10-05 2.00 × 10-05 1.18 × 10-06 1.00 × 10-05 5.00 × 10-05 1.40 × 10-04
Benzene 1.40 1.26 0.45 0.85 1.73 2.83
Beryllium compounds 1.00 × 10-05 1.00 × 10-05 4.53 × 10-07 2.06 × 10-06 1.00 × 10-05 2.00 × 10-05
1,3-Butadiene 0.13 0.12 0.01 0.07 0.17 0.30
Cadmium compounds 1.00 × 10-04 2.00 × 10-05 8.08 × 10-07 4.52 × 10-06 5.00 × 10-05 2.20 × 10-04
Carbon tetrachloride 0.28 0.27 0.27 0.27 0.27 0.29
Chloroform 0.08 0.07 0.04 0.05 0.09 0.16
Chromium VI 3.40 × 10-04 7.00 × 10-05 2.65 × 10-06 2.00 × 10-05 2.10 × 10-04 1.42 × 10-03
1,3-Dichloropropene 0.08 0.07 0.01 0.04 0.11 0.17
Diesel particulate matter 1.18 0.97 0.28 0.53 1.42 2.81
Ethylene oxide 1.19 × 10-02 8.25 × 10-03 7.80 × 10-04 4.35 × 10-03 1.42 × 10-02 3.38 × 10-02
Ethylene dibromide 2.57 × 10-02 2.98 × 10-02 4.00 × 10-04 1.93 × 10-02 3.58 × 10-02 3.73 × 10-02
Ethylene dichloride 0.05 0.05 0.01 0.03 0.05 0.10
Formaldehyde 1.60 1.57 0.55 1.02 2.01 2.97
Hexachlorobenzene 3.00 × 10-05 4.15 × 10-07 1.08 × 10-07 2.38 × 10-07 1.08 × 10-06 6.00 × 10-06
Hydrazine 1.00 × 10-05 2.74 × 10-09 2.88 × 10-15 2.31 × 10-10 6.14 × 10-08 4.00 × 10-05
Lead compounds 2.49 × 10-03 1.73 × 10-03 7.00 × 10-05 4.90 × 10-04 3.07 × 10-03 7.02 × 10-03
Manganese compounds 1.50 × 10-03 6.40 × 10-04 1.00 × 10-05 1.00 × 10-04 1.37 × 10-03 4.60 × 10-03
Mercury compounds 1.63 × 10-03 1.52 × 10-03 1.50 × 10-03 1.51 × 10-03 1.57 × 10-03 1.99 × 10-03
Methylene chloride 0.49 0.48 0.11 0.33 0.63 0.88
Nickel compounds 7.30 × 10-04 4.10 × 10-04 2.00 × 10-05 1.30 × 10-04 8.00 × 10-04 2.39 × 10-03
Polychlorinated biphenyls 4.00 × 10-04 3.90 × 10-04 3.80 × 10-04 3.80 × 10-04 4.00 × 10-04 4.70 × 10-04
Perchloroethylene 0.20 0.20 0.02 0.12 0.27 0.38
Polycyclic Organic Matter 7.73 × 10-03 6.58 × 10-03 1.55 × 10-03 4.07 × 10-03 9.63 × 10-03 1.78 × 10-02
Propylene Dichloride 2.15 × 10-02 2.42 × 10-02 6.64 × 10-03 1.80 × 10-02 2.77 × 10-02 2.80 × 10-02
Quinoline 1.00 × 10-05 2.70 × 10-08 9.65 × 10-14 4.92 × 10-09 2.92 × 10-07 2.00 × 10-05
1,1,2,2-Tetrachloroethane 0.06 0.07 0.02 0.05 0.08 0.08
Trichloroethylene 0.10 0.09 0.05 0.07 0.11 0.16
Vinyl chloride 6.42 × 10-02 6.60 × 10-02 1.04 × 10-03 4.36 × 10-02 7.93 × 10-02 1.19 × 10-01