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	Annual Toxics Summary San Jose-4th Street FAQs Methyl Chloroform parts per billion

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2025		*	*	*	*	*	*	0	*
2024		*	*	*	*	*	*	0	*
2023		*	*	*	*	*	*	0	*
2022		*	*	*	*	*	*	0	*
2021		*	*	*	*	*	*	0	*
2020		*	*	*	*	*	*	0	*
2019		*	*	*	*	*	*	0	*
2018		*	*	*	*	*	*	0	*
2017		*	*	*	*	*	*	0	*
2016		*	*	*	*	*	*	0	*
2015		*	*	*	*	*	*	0	*
2014		*	*	*	*	*	*	0	*
2013		*	*	*	*	*	*	0	*
2012		*	*	*	*	*	*	0	*
2011		*	*	*	*	*	*	0	*
2010		*	*	*	*	*	*	0	*
2009		*	*	*	*	*	*	0	*
2008		*	*	*	*	*	*	0	*
2007		*	*	*	*	*	*	0	*
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		*	*	*	*	*	*	0	*
2002		0.05	*	*	*	0.19	0.046	9	0.01
2001		0.03	0.05	*	0.08	0.19	0.033	28	0.01
2000		0.04	0.06	0.065	0.10	0.12	0.021	29	0.01
1999		0.05	0.06	*	0.10	0.11	0.019	16	0.01
1998		0.03	0.05	*	0.09	0.16	0.026	27	0.01
1997		0.06	0.10	0.174	0.18	1.4	0.264	27	0.01
1996		0.07	0.10	0.125	0.18	0.42	0.068	31	0.01
1995		0.11	0.21	0.223	0.38	0.62	0.123	30	0.01
1994		0.07	0.25	0.358	0.84	1.6	0.360	31	0.01
1993		0.15	0.36	0.687	1.02	5.0	0.979	29	0.01
1992		0.28	0.53	0.643	1.3	2.3	0.420	31	0.01
1991		0.38	0.77	1.64	1.73	18	3.25	28	0.01
1990		0.36	0.61	0.863	1.58	3.6	0.694	27	0.01
1989		0.11	0.75	1.05	2.58	4.1	0.994	23	0.01

	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.