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TABLE 7. OPEN BURNING: AMBIENT CONCENTRATIONS <305 m (1000 FT) <br /> DOWNWIND <br /> No. Fires Concentrations (Ng/m3) <br /> Analyte n' where <br /> meas. Median 90% 90% a3 90th Max <br /> taken LCL2 UCL2 Pcnt4 <br /> Benzene 101 21 121 33 525 17 6,375 79,693 <br /> Toluene 94 21 220 38 527 16 3,766 206,753 <br /> Styrene 86 14 85 20 174 15 2,320 2,705 <br /> Xylenes5 41 9 17 ND 607 11 1,424 3,809 <br /> m,p-Xylene 30 6 76 1 282 9 912 999 <br /> o-Xylene 49 10 35 1 109 12 336 564 <br /> Methylene chloride 39 10 8 ND 89 10 565 836 <br /> Chloroform 33 9 42 ND 197 9 533 1,085 <br /> Ethyl benzene 57 12 49 ND 204 12 502 1,477 <br /> Trichloroethenes 45 11 ND ND 41 11 425 881 <br /> 1,1,2-Trichloroethane 33 7 ND ND 82 9 316 542 <br /> 1,1,1-Trichloroethane 43 12 ND ND 10 11 39 817 <br /> 1,1-Dichloroethane 26 10 ND ND ND 8 16 42 <br /> Chlorobenzene 33 11 ND ND ND 9 2 11 <br /> Trichloroethanes 17 7 ND ND 1 7 1 1 <br /> Carbon tetrachloride 31 10 ND ND ND 9 ND 44 <br /> Tetrachloroethene 28 9 ND ND ND 9 ND ND <br /> ' n = number of measurements <br /> 2 The 90 percent confidence limits lower and upper as determined for the median. <br /> 3 Where a is the number of data values from the median to the upper and to the lower 90 percent <br /> confidence limits. <br /> 4 The analytes in this table are arranged in order of 90th percentile (except for the o-xylene isomer). <br /> 5 Contains mixed isomers. <br /> ND = Not detected. <br /> 14 <br />