Chapter 2	Maximum 24-Hour and Annual PM10 Concentrations by Air Basin			Table 2-13
AIR BASIN	2003 Maximum 24-Hour Concentration in micrograms/cubic meter*		2003 Maximum Annual Average of Quarters in micrograms/cubic meter	
	State	National	State	National
Great Basin Valleys Air Basin	15641	16462	130.4	38.8
Lake County Air Basin	32		10.0	
Lake Tahoe Air Basin	52	61	15.0	17.6
Mojave Desert Air Basin	169	181	27.9	33.2
Mountain Counties Air Basin	58	66	21.0	23.1
North Central Coast Air Basin	90	87	31.6	30.1
North Coast Air Basin	71	65	22.2	21.4
Northeast Plateau Air Basin	31	33	12.8	13.3
Sacramento Valley Air Basin	83	81	28.8	28.4
Salton Sea Air Basin	848	840	79.7	80.0
San Diego Air Basin	289	280	52.6	52.1
San Francisco Bay Area Air Basin	60	58	24.8	24.2
San Joaquin Valley Air Basin	150	150	52.3	52.4
South Central Coast Air Basin	169	149	30.0	30.7
South Coast Air Basin	164	164	56.9	55.6

"*  The table lists the highest value for each statistic. Within an air basin, the highest value for each statistic may reflect a different site."				
"24-hour data - The table may include data from extreme, exceptional, or unusual concentration events: however, there is a mechanism in place to review for these types of events during the area designation process."				
"Annual average data - Extreme, exceptional, or unusual concentration events do not generally significantly influence the annual average.  However, their exclusion can be considered on a case-by-case basis."