2002 Almanac (page 444)  Table C-10  County Emissions (tons/year) for Ten Toxic Air Contaminants by Air Basin		
Salton Sea Air Basin		

TAC	Imperial	Riverside*
Acetaldehyde	102	54
Benzene	388	199
"1,3-Butadiene"	43	29
Carbon Tetrachloride	0	0
Chromium (Hexavalent)	0.02	< .01
para-Dichlorobenzene	8	16
Formaldehyde	301	154
Methylene Chloride	19	60
Perchloroethylene	86	79
Diesel PM	234	172

*  This Air Basin includes only a portion of this county.