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Annual Statewide Toxics Summary		 ARB's ADAM Air Quality Database
Perchloroethylene FAQs
parts per billion
Read About Estimated Risk
Year Months
Present		 Minimum Median Mean 90th
Percentile		 Maximum Standard
Deviation		 Number of
Observations		 Detection
Limit		 Estimated
Risk
2024
0.005 0.005 * 0.02 0.07 0.008 163 0.01 *
2023
0.005 0.005 0.010 0.02 0.13 0.012 324 0.01 1
2022
0.005 0.005 0.008 0.02 0.08 0.008 370 0.01 1
2021
0.005 0.005 * 0.02 0.08 0.008 314 0.01 *
2020
0.005 0.005 * 0.02 0.07 0.008 106 0.01 *
2019
0.005 0.005 0.009 0.02 0.15 0.011 400 0.01 1
2018
0.005 0.005 0.010 0.02 0.14 0.011 392 0.01 1
2017
0.005 0.005 0.010 0.02 0.19 0.015 394 0.01 1
2016
0.005 0.005 0.017 0.04 0.38 0.025 429 0.01 2
2015
0.005 0.01 0.017 0.04 0.13 0.017 412 0.01 2
2014
0.005 0.01 0.019 0.04 0.22 0.021 387 0.01 2
2013
0.005 0.01 0.019 0.04 0.17 0.022 469 0.01 2
2012
0.005 0.01 0.019 0.04 0.21 0.022 467 0.01 2
2011
0.005 0.02 0.024 0.05 0.56 0.041 490 0.01 3
2010
0.005 0.02 0.026 0.05 0.17 0.025 473 0.01 3
2009
0.005 0.02 0.031 0.06 3.2 0.142 522 0.01 4
2008
0.005 0.02 0.033 0.06 2.0 0.095 518 0.01 4
2007
0.005 0.02 0.035 0.08 0.29 0.037 495 0.01 4
2006
0.005 0.03 0.039 0.08 0.42 0.044 504 0.01 5
2005
0.005 0.03 0.047 0.10 0.67 0.060 510 0.01 5
2004
0.005 0.03 0.046 0.09 0.70 0.053 503 0.01 5
2003
0.005 0.04 0.057 0.12 0.61 0.060 503 0.01 7
2002
0.005 0.05 0.077 0.17 0.92 0.099 459 0.01 9
2001
0.005 0.05 0.089 0.21 1.1 0.108 499 0.01 10
2000
0.005 0.07 0.115 0.24 1.9 0.152 497 0.01 13
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 13
1997
0.005 0.05 0.116 0.32 1.2 0.144 557 0.01 13
1996
0.005 0.06 0.134 0.34 1.5 0.191 626 0.01 16
1995
0.01 0.07 0.166 0.41 3.2 0.259 616 0.01 19
1994
0.005 0.07 0.180 0.40 7.7 0.399 611 0.01 21
1993
0.005 0.09 0.270 0.53 28 1.22 596 0.01 31
1992
0.005 0.13 0.210 0.54 1.6 0.227 598 0.01 24
1991
0.02 0.16 0.271 0.55 6.8 0.411 581 0.01 31
1990
0.02 0.17 0.277 0.58 5.0 0.388 579 0.01 32
1989
0.03 0.19 0.432 0.74 14 0.999 449 0.01 50
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.
"*" means there was insufficient or no data available to determine the value.