2002 Almanac (page 452) Table C-16 South Coast Air Basin: Annual Average Concentrations and Health Risks by Site Annual Average Concentration* Health Risk** COUNTY / SITE TAC 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 LOS ANGELES Azusa Acetaldehyde 1.10 5 Benzene 0.69 64 "1,3-Butadiene" 0.15 55 Carbon Tetrachloride 0.09 24 Chromium (Hexavalent) 0.12 19 para-Dichlorobenzene 0.10 7 Formaldehyde 3.05 22 Methylene Chloride 1.32 5 Perchloroethylene 0.18 7 Diesel PM No Monitoring Data Available Total Health Risk 208 LOS ANGELES Burbank-West Palm Avenue Acetaldehyde 3.16 3.89 3.06 2.46 0.79 1.94 2.70 1.70 15 19 15 12 4 9 13 8 Benzene 4.79 3.91 3.44 2.63 3.33 2.45 1.91 1.48 1.66 1.64 1.27 444 362 319 244 308 227 177 137 154 151 117 "1,3-Butadiene" 0.78 0.62 0.73 0.75 0.75 0.61 0.51 0.42 0.48 0.48 0.35 294 234 272 282 283 227 192 158 182 181 130 Carbon Tetrachloride 0.14 0.13 0.10 0.08 0.11 0.09 37 35 28 22 30 25 Chromium (Hexavalent) 0.65 0.37 0.43 1.24 0.23 0.20 0.19 97 55 64 186 34 29 28 para-Dichlorobenzene 0.23 0.22 0.19 0.14 0.20 0.10 0.11 0.13 15 15 12 9 13 7 7 8 Formaldehyde 4.05 3.59 3.66 3.92 4.58 4.72 6.07 4.14 30 26 27 29 34 35 45 30 Methylene Chloride 3.25 1.69 1.42 2.01 1.94 1.82 1.41 1.11 1.07 0.80 11 6 5 7 7 6 5 4 4 3 Perchloroethylene 1.19 0.79 0.61 0.62 0.66 0.49 0.44 0.37 0.50 0.37 48 31 24 25 26 19 18 15 20 15 Diesel PM No Monitoring Data Available Total Health Risk 879 728 732 667 738 744 421 321 468 419 364 LOS ANGELES Los Angeles-North Main Street Acetaldehyde 2.68 2.78 2.50 2.89 2.35 1.28 2.33 1.43 0.84 13 13 12 14 11 6 11 7 4 Benzene 3.50 3.25 2.97 2.54 2.45 2.24 1.86 1.36 1.50 1.04 324 301 275 235 227 207 173 126 139 97 "1,3-Butadiene" 0.60 0.55 0.64 0.73 0.59 0.60 0.54 0.42 0.43 0.30 226 206 242 276 221 225 204 158 162 111 Carbon Tetrachloride 0.14 0.13 0.10 0.08 0.11 0.10 36 35 27 21 30 26 Chromium (Hexavalent) 0.24 0.27 0.23 0.17 0.11 0.13 36 40 35 25 16 19 para-Dichlorobenzene 0.19 0.22 0.19 0.16 0.19 0.12 0.16 13 14 12 10 13 8 11 Formaldehyde 3.50 3.00 2.30 3.23 3.54 4.13 5.87 3.88 2.42 26 22 17 24 26 30 43 29 18 Methylene Chloride 1.28 2.72 0.68 1.05 1.06 1.51 1.10 0.80 1.20 0.68 4 9 2 4 4 5 4 3 4 2 Perchloroethylene 0.55 0.60 0.54 0.59 0.50 0.57 0.50 0.23 0.19 22 24 21 24 20 23 20 9 7 Diesel PM No Monitoring Data Available Total Health Risk 651 623 583 625 559 571 509 326 357 295 LOS ANGELES North Long Beach Acetaldehyde 2.49 2.52 2.36 2.18 0.81 1.43 1.16 12 12 11 11 4 7 6 Benzene 3.53 2.45 2.60 1.99 2.04 1.69 1.24 1.16 1.11 1.00 327 227 241 185 188 157 115 108 103 92 "1,3-Butadiene" 0.59 0.44 0.52 0.58 0.45 0.45 0.36 0.34 0.32 0.28 223 165 197 216 168 169 137 127 121 104 Carbon Tetrachloride 0.14 0.13 0.10 0.12 0.10 37 34 26 31 26 Chromium (Hexavalent) 0.44 0.34 0.22 0.25 0.15 0.11 0.12 0.12 66 51 33 38 22 16 18 18 para-Dichlorobenzene 0.17 0.26 0.19 0.12 0.17 0.16 0.13 11 17 13 8 11 10 8 Formaldehyde 2.97 2.76 3.22 3.06 3.29 3.68 2.88 22 20 24 23 24 27 21 Methylene Chloride 2.05 0.88 1.00 1.15 0.84 0.98 0.74 0.60 0.65 7 3 3 4 3 3 3 2 2 Perchloroethylene 0.48 0.36 0.35 0.43 0.32 0.32 0.23 0.19 0.17 19 14 14 17 13 13 9 8 7 Diesel PM No Monitoring Data Available Total Health Risk 647 486 538 521 447 445 330 292 242 284 RIVERSIDE Riverside-Rubidoux Acetaldehyde 1.87 2.54 1.86 2.19 2.08 0.89 1.84 1.36 1.49 9 12 9 11 10 4 9 7 7 Benzene 2.55 2.22 1.90 1.77 2.01 1.45 1.03 0.87 0.85 236 206 176 164 186 134 95 80 79 "1,3-Butadiene" 0.34 0.31 0.29 0.38 0.36 0.33 0.27 0.21 0.19 128 117 110 143 136 125 100 78 72 Carbon Tetrachloride 0.13 0.14 0.10 0.08 0.10 34 36 27 21 25 Chromium (Hexavalent) 0.33 0.33 0.36 0.38 0.22 0.19 0.35 50 50 55 56 33 29 52 para-Dichlorobenzene 0.13 0.13 0.16 0.12 0.17 0.11 0.14 9 8 10 8 11 7 9 Formaldehyde 1.75 2.70 1.53 2.73 2.50 2.65 4.15 3.55 3.17 13 20 11 20 18 19 31 26 23 Methylene Chloride 0.69 0.60 1.10 0.93 0.98 0.83 0.58 0.69 2 2 4 3 3 3 2 2 Perchloroethylene 0.24 0.28 0.20 0.20 0.19 0.18 0.18 0.13 9 11 8 8 8 7 7 5 Diesel PM Total Health Risk 429 413 374 410 424 386 306 222 274 SAN BERNARDINO Fontana-Arrow Highway Acetaldehyde Benzene 0.98 91 "1,3-Butadiene" 0.24 92 Carbon Tetrachloride 0.11 30 Chromium (Hexavalent) para-Dichlorobenzene Formaldehyde Methylene Chloride 0.59 2 Perchloroethylene 0.18 7 Diesel PM No Monitoring Data Available Total Health Risk 222 SAN BERNARDINO Upland-San Bernardino Road Acetaldehyde 2.12 3.28 2.36 2.84 2.42 1.09 2.13 10 16 11 14 12 5 10 Benzene 2.73 2.70 2.14 1.92 2.15 1.62 1.11 1.11 253 250 198 178 199 150 103 103 "1,3-Butadiene" 0.35 0.34 0.31 0.39 0.34 0.31 0.26 0.25 131 128 116 147 126 117 97 95 Carbon Tetrachloride 0.13 0.14 0.10 0.10 0.08 35 36 27 26 20 Chromium (Hexavalent) 0.22 0.16 0.16 0.20 0.12 33 24 24 30 17 para-Dichlorobenzene 0.13 0.14 0.14 0.10 0.13 0.10 0.14 9 9 9 7 9 7 9 Formaldehyde 2.35 3.34 1.98 3.25 2.67 3.21 5.20 17 25 15 24 20 24 38 Methylene Chloride 1.41 1.59 0.82 0.87 0.72 1.13 0.66 1.70 5 6 3 3 3 4 2 6 Perchloroethylene 0.42 0.72 0.36 0.40 0.29 0.26 0.20 0.21 17 29 15 16 11 11 8 8 Diesel PM Total Health Risk No Monitoring Data Available 468 499 400 442 402 376 302 221 BASIN SUMMARY Acetaldehyde 2.46 3.00 2.46 2.67 2.30 0.97 2.08 1.77 1.54 1.63 1.26 12 15 12 13 11 5 10 9 7 8 6 Benzene 3.42 2.91 2.61 2.17 2.40 1.89 1.45 1.34 1.25 1.20 0.97 317 269 242 201 222 175 134 124 116 111 90 "1,3-Butadiene" 0.53 0.45 0.50 0.57 0.50 0.46 0.39 0.38 0.35 0.33 0.25 200 170 187 212 187 173 146 142 133 123 94 Carbon Tetrachloride 0.14 0.13 0.11 0.10 0.08 0.11 0.10 36 35 28 27 21 30 25 Chromium (Hexavalent) 0.39 0.29 0.29 0.46 0.18 0.17 0.15 0.14 0.18 59 43 43 69 27 25 22 22 27 para-Dichlorobenzene 0.17 0.19 0.17 0.13 0.17 0.11 0.13 0.13 11 13 11 8 11 7 9 9 Formaldehyde 2.92 3.08 2.22 3.22 3.14 3.57 5.06 4.47 3.79 4.06 3.13 22 23 16 24 23 26 37 33 28 30 23 Methylene Chloride 1.86 1.51 0.90 1.23 1.10 1.28 0.95 1.14 0.85 0.92 0.83 6 5 3 4 4 4 3 4 3 3 3 Perchloroethylene 0.58 0.55 0.41 0.45 0.39 0.36 0.32 0.27 0.26 0.21 23 22 16 18 16 15 13 11 10 8 Diesel PM 3.6 2.7 2.4 1080 810 720 Average Basin Health Risk 616 550 548 554 514 505 398 357 349 297 285 * Concentrations for Chromium (Hexavalent) are expressed as ng/m3 and concentrations for Diesel PM are expressed as ug/m3. Concentrations for all other TACs are expressed as parts per billion. ** Health Risk represents the number of excess cancer cases per million people based on a lifetime (70-year) exposure to the annual average concentration. Total Health Risk represents only those compounds listed in this table and only those with data for that year. There may be other significant compounds for which monitoring and/or health risk information are not available. "*** The Diesel PM concentrations are estimates based on receptor modeling. Because data are not available for all years, Diesel PM is not included in the Average Basin Health Risk number. "