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California Air Resources Board

Annual Toxics Summary		 ARB's ADAM Air Quality Database
Chula Vista
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 0.04 0.048 0.08 0.19 0.039 31 0.01 2
2001
0.01 0.05 0.057 0.09 0.29 0.054 30 0.01 2
2000
0.01 0.06 0.078 0.17 0.32 0.074 29 0.01 3
1999
0.005 0.07   0.19 0.22 0.075 17 0.01  
1998
0.005 0.05   0.17 0.27 0.069 25 0.01  
1997
0.01 0.08 0.103 0.25 0.39 0.097 29 0.01 4
1996
0.02 0.10   0.23 0.45 0.102 26 0.01  
1995
0.02 0.12 0.146 0.36 0.54 0.133 29 0.01 6
1994
0.005 0.07 0.132 0.28 0.51 0.121 31 0.01 5
1993
0.02 0.12 0.144 0.23 0.53 0.109 31 0.01 6
1992
0.06 0.19 0.208 0.35 0.65 0.130 30 0.01 8
1991
0.06 0.19 0.229 0.42 0.53 0.129 30 0.01 9
1990
0.08 0.23 0.236 0.41 0.48 0.107 31 0.01 9
1989
0.08 0.30 1.90 0.53 14 3.67 25 0.01 76
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.