Chapter 2	Maximum 24-Hour and Annual PM10 Concentrations by Air Basin			Table 2-13
AIR BASIN	2004 Maximum 24-Hour Concentration in micrograms/cubic meter*		2004 Maximum Annual Average of Quarters in micrograms/cubic meter	
	State	National	State	National
Great Basin Valleys Air Basin	4797.0	4913.0	68.3	25.4
Lake County Air Basin	22.0		10.0	
Lake Tahoe Air Basin	112.0	130.0	37.5	44.2
Mojave Desert Air Basin	83.0	88.0	18.3	33.1
Mountain Counties Air Basin	124.0	133.0	26.3	28.0
North Central Coast Air Basin	83.0	80.0	28.2	27.3
North Coast Air Basin	64.0	61.0	20.6	20.7
Northeast Plateau Air Basin	29.0	32.0	12.8	13.6
Sacramento Valley Air Basin	171.0	169.0	43.2	42.6
Salton Sea Air Basin	364.0	354.0	60.3	60.8
San Diego Air Basin	138.0	137.0	51.7	51.2
San Francisco Bay Area Air Basin	65.0	63.0	26.0	25.3
San Joaquin Valley Air Basin	219.0	217.0	43.6	44.6
South Central Coast Air Basin	69.0	146.0	28.8	31.4
South Coast Air Basin	133.0	137.0	53.5	54.8

"* The table lists the highest value for each statistic. Within an air basin, the highest value for each statistic may reflect a different site. In addition, the State and national requirements for data completeness are different. This may"				
"result in marked differences between the State and national values for the same statistic (e.g., maximum annual averages for the Great Basin Valleys and the Mojave Desert air basins)."				
"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."