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	Annual Toxics Summary Riverside-Rubidoux FAQs HFC- 152a parts per billion

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2025		*	*	*	*	*	*	0	*
2024		0.1	0.3	*	0.6	0.9	0.22	24	0.2
2023		0.1	0.3	0.33	0.7	1.1	0.26	30	0.2
2022		0.1	0.3	0.39	0.8	1.3	0.29	29	0.2
2021		0.1	0.3	*	0.9	1.5	0.38	22	0.2
2020		0.1	*	*	*	0.7	0.24	7	0.2
2019		0.1	0.2	*	1.1	1.9	0.51	25	0.2
2018		*	*	*	*	*	*	0	*
2017		0.1	0.3	*	0.7	7.3	1.61	19	0.2
2016		0.1	0.2	0.50	0.9	3.3	0.69	30	0.2
2015		0.1	0.3	*	0.5	1.4	0.28	25	0.2
2014		0.1	0.3	0.45	0.6	3.7	0.69	27	0.2
2013		0.1	0.3	0.30	0.5	1.1	0.24	31	0.2
2012		0.1	0.1	0.22	0.4	0.5	0.12	30	0.2
2011		0.1	0.1	*	0.3	0.3	0.08	18	0.2
2010		0.1	0.1	*	0.4	0.9	0.19	26	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.