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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
San Jose-4th Street
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 0.004 9 0.02  
2001
0.08 0.09   0.10 0.11 0.008 28 0.02  
2000
0.07 0.09 0.095 0.12 0.14 0.016 29 0.02 25
1999
0.08 0.08   0.12 0.13 0.018 15 0.02  
1998
0.09 0.11   0.15 0.17 0.025 29 0.02  
1997
0.08 0.11   0.12 0.13 0.012 20 0.02  
1996
0.06 0.08 0.077 0.09 0.10 0.008 31 0.02 20
1995
0.07 0.10 0.102 0.11 0.13 0.010 30 0.02 27
1994
0.08 0.11   0.13 0.13 0.020 22 0.02  
1993
0.08 0.11 0.107 0.13 0.15 0.016 27 0.02 28
1992
0.10 0.11   0.13 0.14 0.010 22 0.02  
1991
0.11 0.13 0.128 0.14 0.16 0.012 28 0.02 34
1990
0.10 0.13 0.127 0.14 0.15 0.010 27 0.02 33
1989
0.09 0.11 0.115 0.14 0.15 0.015 23 0.02 30
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.