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California Air Resources Board

Annual Statewide Toxics Summary		 ARB's ADAM Air Quality Database
Carbon Tetrachloride
parts per billion
Year Months
Present		 Minimum Median Mean 90th
Percentile		 Maximum Standard
Deviation		 Number of
Observations		 Detection
Limit		 Estimated
Risk
2002
0.01 0.09 0.091 0.10 0.11 0.010 459 0.02 24
2001
0.04 0.09 0.087 0.09 0.12 0.008 499 0.02 23
2000
0.01 0.09 0.094 0.12 0.14 0.015 497 0.02 25
1999
0.06 0.08   0.12 0.13 0.015 236 0.02  
1998
0.04 0.11 0.114 0.15 0.20 0.022 515 0.02 30
1997
0.07 0.11   0.12 0.16 0.015 401 0.02  
1996
0.05 0.08 0.078 0.09 0.18 0.009 626 0.02 21
1995
0.06 0.10 0.100 0.11 0.14 0.011 614 0.02 26
1994
0.05 0.11   0.13 0.14 0.018 405 0.02  
1993
0.05 0.10 0.106 0.13 0.20 0.016 532 0.02 28
1992
0.08 0.12   0.13 0.17 0.011 409 0.02  
1991
0.07 0.13 0.128 0.15 0.23 0.015 565 0.02 34
1990
0.09 0.13 0.131 0.15 0.30 0.014 572 0.02 34
1989
0.06 0.11 0.115 0.14 0.34 0.021 445 0.02 30
Graph It!
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.