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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
Stockton-Hazelton 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 0.091 0.10 0.11 0.009 28 0.02 24
2001
0.07 0.09 0.087 0.10 0.11 0.008 31 0.02 23
2000
0.08 0.09 0.098 0.12 0.13 0.014 31 0.02 26
1999
0.07 0.08   0.11 0.12 0.015 14 0.02  
1998
0.08 0.11 0.115 0.14 0.16 0.021 29 0.02 30
1997
0.09 0.11   0.12 0.15 0.014 21 0.02  
1996
0.06 0.08 0.077 0.09 0.09 0.009 31 0.02 20
1995
0.07 0.10 0.099 0.11 0.12 0.010 30 0.02 26
1994
0.07 0.11   0.13 0.13 0.020 21 0.02  
1993
0.09 0.11   0.15 0.20 0.023 29 0.02  
1992
0.10 0.12   0.13 0.13 0.010 19 0.02  
1991
0.11 0.13 0.136 0.15 0.19 0.016 29 0.02 36
1990
0.10 0.13 0.131 0.15 0.15 0.012 29 0.02 35
1989
0.07 0.12 0.130 0.15 0.17 0.025 23 0.02 34
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.