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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
Burbank-W Palm Avenue
Carbon Tetrachloride
parts per billion
Year Months
Present		 Minimum Median Mean 90th
Percentile		 Maximum Standard
Deviation		 Number of
Observations		 Detection
Limit		 Estimated
Risk
2002
0.06 0.09 0.091 0.10 0.11 0.011 31 0.02 24
2001
0.07 0.09 0.086 0.09 0.10 0.007 30 0.02 23
2000
0.08 0.09 0.094 0.12 0.12 0.012 29 0.02 25
1999
0.08 0.08   0.09 0.11 0.009 13 0.02  
1998
0.07 0.11 0.114 0.15 0.15 0.023 28 0.02 30
1997
0.09 0.11   0.12 0.15 0.016 20 0.02  
1996
0.07 0.08 0.082 0.09 0.10 0.009 30 0.02 22
1995
0.08 0.10 0.104 0.11 0.12 0.009 31 0.02 28
1994
0.06 0.11   0.12 0.13 0.018 20 0.02  
1993
0.09 0.10   0.13 0.15 0.014 29 0.02  
1992
0.11 0.13   0.14 0.16 0.014 20 0.02  
1991
0.10 0.14 0.133 0.15 0.15 0.013 23 0.02 35
1990
0.11 0.14 0.141 0.15 0.18 0.015 28 0.02 37
1989
0.08       0.15 0.021 10 0.02  
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.