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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
San Francisco-Arkansas Street
Trichloroethylene
parts per billion
Year Months
Present		 Minimum Median Mean 90th
Percentile		 Maximum Standard
Deviation		 Number of
Observations		 Detection
Limit		 Estimated
Risk
2002
0.01 0.01   0.04 0.06 0.016 16 0.02  
2001
0.01 0.01 0.014 0.03 0.04 0.008 30 0.02 0.1
2000
0.01 0.03 0.026 0.04 0.09 0.017 28 0.02 0.3
1999
0.01 0.02   0.04 0.06 0.015 19 0.02  
1998
0.01 0.01   0.06 0.13 0.027 28 0.02  
1997
0.01 0.01 0.015 0.03 0.04 0.008 29 0.02 0.2
1996
0.01 0.03 0.028 0.05 0.07 0.016 31 0.02 0.3
1995
0.01 0.02 0.019 0.03 0.04 0.010 29 0.02 0.2
1994
0.01 0.01 0.018 0.04 0.06 0.013 30 0.02 0.2
1993
0.01 0.03   0.04 0.09 0.014 27 0.02  
1992
0.01 0.02 0.031 0.05 0.19 0.045 31 0.02 0.3
1991
0.01 0.05   0.09 0.48 0.091 25 0.02  
1990
0.01 0.04   0.05 0.08 0.015 27 0.02  
1989
0.03 0.08 0.088 0.14 0.22 0.044 23 0.02 0.9
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.