California Home
ARB:
Home
Search
Site Map
Contact Us
Annual Statewide Toxics Summary
HFC- 152a
FAQs
parts per billion
Year
Months
Present
Minimum
Median
Mean
90th
Percentile
Maximum
Standard
Deviation
Number of
Observations
Detection
Limit
2024
0.1
0.1
*
0.5
5.2
0.62
139
0.2
2023
0.1
0.1
0.63
0.6
91
5.07
324
0.2
2022
0.1
0.1
0.30
0.6
4.7
0.40
370
0.2
2021
0.1
0.2
*
0.9
24
1.87
313
0.2
2020
0.1
0.2
*
0.5
2.1
0.26
106
0.2
2019
0.1
0.1
0.34
0.7
10
0.71
397
0.2
2018
0.1
0.3
*
0.9
100
5.37
353
0.2
2017
0.1
0.1
0.36
0.6
15
0.88
384
0.2
2016
0.1
0.1
0.26
0.5
4.2
0.34
425
0.2
2015
0.1
0.1
0.88
0.5
100
5.03
404
0.2
2014
0.1
0.1
0.25
0.5
4.8
0.36
382
0.2
2013
0.1
0.1
0.30
0.6
9.3
0.64
459
0.2
2012
0.1
0.1
0.33
0.5
9.5
0.73
452
0.2
2011
0.1
0.1
*
0.5
6.0
0.61
278
0.2
2010
0.1
0.1
0.63
0.6
160
7.91
410
0.2
2009
*
*
*
*
*
*
0
*
2008
*
*
*
*
*
*
0
*
2007
*
*
*
*
*
*
0
*
2006
*
*
*
*
*
*
0
*
2005
*
*
*
*
*
*
0
*
2004
*
*
*
*
*
*
0
*
2003
*
*
*
*
*
*
0
*
2002
*
*
*
*
*
*
0
*
2001
*
*
*
*
*
*
0
*
2000
*
*
*
*
*
*
0
*
1999
*
*
*
*
*
*
0
*
1998
*
*
*
*
*
*
0
*
1997
*
*
*
*
*
*
0
*
1996
*
*
*
*
*
*
0
*
1995
*
*
*
*
*
*
0
*
1994
*
*
*
*
*
*
0
*
1993
*
*
*
*
*
*
0
*
1992
*
*
*
*
*
*
0
*
1991
*
*
*
*
*
*
0
*
1990
*
*
*
*
*
*
0
*
1989
*
*
*
*
*
*
0
*
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.
