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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
San Jose-4th 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       0.03 0.009 9 0.02  
2001
0.01 0.03   0.05 0.09 0.020 28 0.02  
2000
0.01 0.01 0.018 0.04 0.08 0.016 29 0.02 0.2
1999
0.01 0.01   0.04 0.05 0.013 23 0.02  
1998
0.01 0.01   0.04 0.05 0.013 29 0.02  
1997
0.01 0.01 0.018 0.03 0.12 0.022 27 0.02 0.2
1996
0.01 0.01 0.022 0.02 0.33 0.058 31 0.02 0.2
1995
0.01 0.01 0.017 0.03 0.03 0.009 30 0.02 0.2
1994
0.01 0.01 0.013 0.03 0.05 0.011 31 0.02 0.1
1993
0.01 0.01 0.013 0.02 0.04 0.007 30 0.02 0.1
1992
0.01 0.03 0.028 0.04 0.18 0.030 31 0.02 0.3
1991
0.03 0.06   0.08 0.12 0.023 27 0.02  
1990
0.02 0.04 0.051 0.08 0.19 0.035 27 0.02 0.5
1989
0.06 0.08 0.091 0.13 0.16 0.029 23 0.02 1
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.