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	Annual Toxics Summary Los Angeles-North Main Street FAQs HFC- 152a parts per billion

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2024		*	*	*	*	*	*	0	*
2023		*	*	*	*	*	*	0	*
2022		0.3	0.4	*	1.0	1.1	0.29	11	0.2
2021		0.1	0.6	*	1.8	22	4.56	22	0.2
2020		0.1	*	*	*	0.4	0.12	5	0.2
2019		0.1	0.3	*	0.7	1.0	0.25	20	0.2
2018		0.1	0.3	*	0.9	6.3	1.46	17	0.2
2017		0.1	0.2	0.33	0.5	1.2	0.24	29	0.2
2016		0.1	0.3	0.28	0.5	0.7	0.17	30	0.2
2015		0.1	0.3	8.64	0.6	100	20.3	24	0.2
2014		0.1	0.2	*	0.6	1.2	0.31	24	0.2
2013		0.1	0.3	0.47	0.6	7.1	1.26	30	0.2
2012		0.1	0.1	0.21	0.4	0.6	0.14	29	0.2
2011		0.1	0.1	*	0.4	0.7	0.17	19	0.2
2010		0.1	0.1	*	0.6	0.8	0.21	25	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.