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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
Chula Vista
Chloroform
parts per billion
Year Months
Present		 Minimum Median Mean 90th
Percentile		 Maximum Standard
Deviation		 Number of
Observations		 Detection
Limit		 Estimated
Risk
2002
0.01 0.03 0.031 0.05 0.11 0.022 31 0.02 0.8
2001
0.01 0.02 0.020 0.03 0.05 0.011 30 0.02 0.5
2000
0.01 0.03 0.041 0.05 0.43 0.075 29 0.02 1
1999
0.01 0.02   0.06 0.07 0.019 18 0.02  
1998
0.01 0.02   0.04 0.07 0.016 23 0.02  
1997
0.01 0.02 0.026 0.04 0.06 0.014 27 0.02 0.7
1996
0.01 0.03   0.04 0.05 0.013 26 0.02  
1995
0.01 0.03 0.033 0.06 0.09 0.021 29 0.02 0.8
1994
0.01 0.01 0.018 0.03 0.05 0.012 31 0.02 0.5
1993
0.01 0.01 0.018 0.03 0.03 0.009 31 0.02 0.5
1992
0.01 0.01 0.020 0.04 0.06 0.014 30 0.02 0.5
1991
0.01 0.01 0.019 0.03 0.06 0.012 29 0.02 0.5
1990
0.01 0.01 0.015 0.03 0.04 0.009 31 0.02 0.4
1989
0.01 0.03 0.028 0.05 0.06 0.014 25 0.02 0.7
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.