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	Annual Toxics Summary Los Angeles-North Main Street FAQs Methyl tertiary-Butyl Ether parts per billion

Read About Estimated Risk

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit	Estimated Risk
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		0.15	*	*	*	0.15	0.00	7	0.3	*
2003		0.15	0.15	0.36	0.8	1.7	0.35	29	0.3	2
2002		0.8	1.7	*	4.3	5.4	1.38	22	0.3	*
2001		0.9	2.0	2.38	4.5	5.2	1.26	27	0.3	13
2000		0.6	2.3	2.38	3.7	7.7	1.44	29	0.3	13
1999		1.0	2.8	*	8.3	9.9	2.80	20	0.3	*
1998		0.8	2.8	3.02	5.1	6.5	1.58	29	0.3	16
1997		1.6	4.0	*	7.7	12	2.66	18	0.3	*
1996		1.1	3.8	*	6.1	11.1	2.14	25	0.3	*
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.