California Air Resources Board 2004 Almanac (web)			Table C-12																					
Appendix C	County Emissions for Ten Toxic Air Contaminants - San Francisco Bay Area Air Basin																							
TAC	Alameda	Contra Costa	Marin	Napa	San Francisco	San Mateo	Santa Clara	Solano	Sonoma															
Acetaldehyde	308	173	55	36	150	153	270	113	94															
Benzene	432	351	127	68	215	252	539	127	133															
"1,3-Butadiene"	94	69	28	14	42	62	109	44	27															
Carbon Tetrachloride	0.03	1.46	< .01	< .01	0.00	< .01	< .01	< .01	0.02															
Chromium (Hexavalent)	0.03	< .01	< .01	< .01	< .01	0.02	0.02	0.02	< .01															
para-DiChlorobenzene	77	50	13	7	41	39	92	15	21															
Formaldehyde	654	488	148	89	356	411	736	328	202															
Methylene Chloride	260	132	35	19	119	119	323	42	84															
Perchloroethylene	184	106	43	12	115	114	223	27	46															
Diesel PM	910	705	162	112	773	400	914	162	302