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California Air Resources Board

Annual Statewide Toxics Summary		 ARB's ADAM Air Quality Database
Perchloroethylene
parts per billion
Year Months
Present		 Minimum Median Mean 90th
Percentile		 Maximum Standard
Deviation		 Number of
Observations		 Detection
Limit		 Estimated
Risk
2002
0.005 0.05 0.077 0.17 0.92 0.099 459 0.01 3
2001
0.005 0.05 0.089 0.21 1.1 0.108 499 0.01 4
2000
0.005 0.07 0.115 0.24 1.9 0.152 497 0.01 5
1999
0.005 0.06   0.28 2.1 0.207 394 0.01  
1998
0.005 0.04 0.114 0.28 2.2 0.196 512 0.01 5
1997
0.005 0.05 0.116 0.32 1.2 0.144 557 0.01 5
1996
0.005 0.06 0.134 0.34 1.5 0.191 626 0.01 5
1995
0.01 0.07 0.166 0.41 3.2 0.259 616 0.01 7
1994
0.005 0.07 0.180 0.40 7.7 0.399 611 0.01 7
1993
0.005 0.09 0.270 0.53 28 1.22 596 0.01 11
1992
0.005 0.13 0.210 0.54 1.6 0.227 598 0.01 8
1991
0.02 0.16 0.271 0.55 6.8 0.411 581 0.01 11
1990
0.02 0.17 0.277 0.58 5.0 0.388 579 0.01 11
1989
0.03 0.19 0.432 0.74 14 0.999 449 0.01 17
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.