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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
Burbank-W Palm Avenue
Perchloroethylene
parts per billion
Year Months
Present		 Minimum Median Mean 90th
Percentile		 Maximum Standard
Deviation		 Number of
Observations		 Detection
Limit		 Estimated
Risk
2002
0.04 0.17 0.247 0.47 0.81 0.198 31 0.01 10
2001
0.08 0.24 0.296 0.49 1.1 0.236 30 0.01 12
2000
0.12 0.27 0.368 0.62 1.9 0.348 29 0.01 15
1999
0.03 0.46   1.74 2.1 0.605 19 0.01  
1998
0.04 0.38 0.503 0.80 1.8 0.427 28 0.01 20
1997
0.11 0.34 0.365 0.51 1.2 0.227 29 0.01 15
1996
0.09 0.38 0.440 0.61 1.4 0.230 30 0.01 18
1995
0.03 0.39 0.487 0.91 1.7 0.360 31 0.01 19
1994
0.04 0.42 0.663 1.42 2.1 0.530 29 0.01 26
1993
0.04 0.48 0.620 1.28 1.7 0.472 33 0.01 25
1992
0.11 0.60 0.609 1.01 1.5 0.305 30 0.01 24
1991
0.07 0.60 0.785 1.56 2.4 0.615 29 0.01 31
1990
0.20 0.85 1.19 3.1 5.0 1.09 31 0.01 48
1989
0.15 1.2   3.04 5.0 1.37 12 0.01  
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.