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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
Los Angeles-North Main 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   0.07 0.08 0.021 23 0.02  
2001
0.01 0.28 0.314 0.55 1.7 0.356 28 0.02 3
2000
0.03 0.34 0.379 0.81 0.91 0.271 29 0.02 4
1999
0.01 0.16   1.02 3.3 0.770 19 0.02  
1998
0.01 0.15 0.195 0.35 1.3 0.244 29 0.02 2
1997
0.01 0.17   0.41 0.59 0.149 22 0.02  
1996
0.01 0.11 0.173 0.45 0.62 0.162 28 0.02 2
1995
0.02 0.15 0.270 0.53 2.4 0.432 31 0.02 3
1994
0.01 0.13 0.504 0.33 8.7 1.59 29 0.02 5
1993
0.01 0.15 0.165 0.32 0.83 0.172 26 0.02 2
1992
0.07 0.32 0.370 0.59 1.3 0.234 31 0.02 4
1991
0.03 0.14 0.228 0.48 0.79 0.186 28 0.02 2
1990
0.03 0.11 0.130 0.22 0.68 0.126 28 0.02 1
1989
0.09 0.20   0.47 1.0 0.210 21 0.02  
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.