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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
Chula Vista
Carbon Tetrachloride
parts per billion
Year Months
Present		 Minimum Median Mean 90th
Percentile		 Maximum Standard
Deviation		 Number of
Observations		 Detection
Limit		 Estimated
Risk
2002
0.08 0.09 0.091 0.10 0.11 0.010 31 0.02 24
2001
0.07 0.09 0.086 0.09 0.10 0.007 30 0.02 23
2000
0.07 0.09 0.093 0.10 0.13 0.012 29 0.02 25
1999
0.08       0.12 0.019 10 0.02  
1998
0.08 0.11   0.15 0.18 0.024 25 0.02  
1997
0.08 0.11   0.12 0.14 0.014 20 0.02  
1996
0.07 0.07   0.08 0.08 0.005 26 0.02  
1995
0.07 0.10 0.097 0.11 0.13 0.012 28 0.02 26
1994
0.08 0.11   0.13 0.13 0.016 19 0.02  
1993
0.08 0.10 0.101 0.12 0.15 0.016 29 0.02 27
1992
0.11 0.12   0.13 0.15 0.011 20 0.02  
1991
0.10 0.13 0.129 0.14 0.15 0.010 29 0.02 34
1990
0.11 0.13 0.132 0.14 0.16 0.010 31 0.02 35
1989
0.07 0.11 0.111 0.13 0.14 0.019 25 0.02 29
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.