Appendix C San Diego Table C_11 TAC San Diego Acetaldehyde 508 Benzene 899 "1,3-Butadiene" 215 Carbon Tetrachloride 0.12 Chromium (Hexavalent) 0.24 para-DiChlorobenzene 161 Formaldehyde 1324 Methylene Chloride 378 Perchloroethylene 638 Diesel PM 1527