1999 Maximum Annual Geometric Mean in	
AIR BASIN	micrograms/cubic meter	
Great Basin Valleys Air Basin	14.00	
Lake County Air Basin	Incomplete Data	
Lake Tahoe Air Basin	17.40	
Mojave Desert Air Basin	27.90	
Mountain Counties Air Basin	22.50	
North Central Coast Air Basin	27.60	
North Coast Air Basin	21.20	
Northeast Plateau Air Basin	22.20	
Sacramento Valley Air Basin	30.30	
Salton Sea Air Basin	66.30	
San Diego Air Basin	47.50	
San Francisco Bay Area Air Basin	25.40	
San Joaquin Valley Air Basin	50.30	
South Central Coast Air Basin	28.10	
South Coast Air Basin	64.90