TAC	Alameda	Contra Costa	Marin	Napa	San Francisco	San Mateo	Santa Clara	Solano	Sonoma (part)
Acetaldehyde	363	210	70	44	157	169	300	189	110
Benzene	890	735	270	171	414	427	1015	298	283
"1,3-Butadiene"	141	102	43	27	60	73	150	85	41
Carbon tetrachloride	< .01	2.18	< .01	< .01	0	< .01	0.01	< .01	< .01
Chromium (Hexavalent)	0.019	0.0169	0.0022	0.0015	0.002	0.0012	0.0089	0.1835	0.003
para-Dichlorobenzene	66	43	12	6	36	34	79	13	18
Formaldehyde	798	603	190	118	397	452	815	586	249
Methylene Chloride	366	173	40	19	129	152	978	42	76
Perchloroethylene	371	203	59	19	226	186	322	45	47
Diesel PM	947	656	157	110	652	360	873	174	292