California Air Resources Board 2008 Almanac (web) Appendix C San Diego Table C_12 TAC San Diego Acetaldehyde 589 Benzene 869 "1,3-Butadiene" 241 Carbon Tetrachloride 0.09 Chromium (Hexavalent) 0.23 para-DiChlorobenzene 122 Formaldehyde 1426 Methylene Chloride 367 Perchloroethylene 422 Diesel PM 2083