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	Annual Toxics Summary Concord-2975 Treat Blvd FAQs Methyl Chloroform parts per billion

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
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	*
2001		*	*	*	*	*	*	0	*
2000		0.005	*	*	*	0.11	0.037	5	0.01
1999		0.05	0.06	*	0.06	0.09	0.011	12	0.01
1998		0.05	0.08	*	0.22	0.30	0.079	15	0.01
1997		0.05	0.10	0.138	0.20	0.41	0.083	29	0.01
1996		0.06	0.11	0.250	0.17	4.9	0.861	31	0.01
1995		0.09	0.17	0.215	0.36	1.0	0.173	30	0.01
1994		0.07	0.19	0.367	0.84	2.0	0.429	32	0.01
1993		0.13	0.27	0.430	0.57	3.8	0.655	30	0.01
1992		0.20	0.40	0.885	0.70	11	1.90	31	0.01
1991		0.22	0.40	0.487	0.87	1.0	0.230	29	0.01
1990		0.17	0.42	0.483	0.92	1.2	0.287	28	0.01
1989		0.09	0.41	0.458	0.73	0.80	0.218	17	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.