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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
Chula Vista
Methyl tertiary-Butyl Ether
parts per billion
Year Months
Present		 Minimum Median Mean 90th
Percentile		 Maximum Standard
Deviation		 Number of
Observations		 Detection
Limit
2002
0.15 0.8 1.03 1.8 3.4 0.69 30 0.3
2001
0.4 1.0 0.94 1.7 2.2 0.48 28 0.3
2000
0.15 1.0 1.18 2.3 4.4 0.96 30 0.3
1999
0.5 1.5   2.9 3.2 0.92 19 0.3
1998
0.15 0.9 1.09 2.1 3.1 0.75 28 0.3
1997
0.6       3.1 0.98 7 0.3
1996
            0  
1995
            0  
1994
            0  
1993
            0  
1992
            0  
1991
            0  
1990
            0  
1989
            0  
Notes:  Values below the Limit of Detection (LoD) assumed to be ½ LoD.
Means and risks shown only for years with data in all 12 months.
Risks shown only for those substances with unit risk factors.