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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
Fresno-1st 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
0.07 0.09 0.089 0.10 0.11 0.011 31 0.02 23
2001
0.06 0.09 0.086 0.09 0.12 0.010 30 0.02 23
2000
0.08 0.09 0.095 0.11 0.14 0.015 30 0.02 25
1999
0.08 0.08   0.08 0.09 0.003 12 0.02  
1998
0.11 0.13   0.15 0.17 0.017 15 0.02  
1997
0.07 0.11   0.12 0.12 0.013 21 0.02  
1996
0.06 0.08 0.078 0.09 0.11 0.010 31 0.02 21
1995
0.07 0.10 0.099 0.11 0.12 0.011 30 0.02 26
1994
0.05 0.11   0.12 0.13 0.020 20 0.02  
1993
0.08 0.11 0.108 0.13 0.15 0.016 26 0.02 28
1992
0.08 0.11   0.13 0.14 0.012 21 0.02  
1991
0.10 0.12 0.122 0.13 0.15 0.012 30 0.02 32
1990
0.12 0.13   0.14 0.14 0.007 24 0.02  
1989
            0    
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.