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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
Concord-2975 Treat Blvd
Chloroform
parts per billion
Year Months
Present		 Minimum Median Mean 90th
Percentile		 Maximum Standard
Deviation		 Number of
Observations		 Detection
Limit		 Estimated
Risk
2002
            0    
2001
            0    
2000
0.01       0.04 0.015 5 0.02  
1999
0.01 0.03   0.06 0.08 0.020 21 0.02  
1998
0.01 0.03   0.04 0.32 0.077 15 0.02  
1997
0.01 0.03 0.029 0.05 0.06 0.014 28 0.02 0.7
1996
0.01 0.03 0.032 0.04 0.14 0.024 31 0.02 0.8
1995
0.01 0.04 0.041 0.07 0.13 0.026 30 0.02 1
1994
0.01 0.01 0.026 0.05 0.14 0.025 32 0.02 0.7
1993
0.01 0.03 0.032 0.06 0.08 0.022 30 0.02 0.8
1992
0.01 0.03 0.029 0.05 0.07 0.016 31 0.02 0.8
1991
0.01 0.02 0.031 0.07 0.10 0.025 29 0.02 0.8
1990
0.01 0.03 0.031 0.06 0.07 0.018 28 0.02 0.8
1989
0.02 0.03 0.038 0.06 0.10 0.020 22 0.02 1
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.