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	Annual Toxics Summary Los Angeles-North Main Street 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		0.005	0.005	*	0.005	0.005	0.000	11	0.01
2021		0.005	0.005	*	0.005	0.005	0.000	22	0.01
2020		0.005	*	*	*	0.005	0.000	5	0.01
2019		0.005	0.005	*	0.005	0.005	0.000	20	0.01
2018		0.005	0.005	*	0.005	0.005	0.000	20	0.01
2017		0.005	0.005	0.008	0.01	0.05	0.008	29	0.01
2016		0.005	0.005	0.005	0.005	0.01	0.002	31	0.01
2015		0.005	0.005	0.007	0.005	0.04	0.007	26	0.01
2014		0.005	0.005	*	0.01	0.03	0.005	21	0.01
2013		0.005	0.005	0.006	0.01	0.02	0.002	31	0.01
2012		0.005	0.005	0.007	0.01	0.01	0.003	29	0.01
2011		0.005	0.01	0.009	0.02	0.02	0.004	31	0.01
2010		0.005	0.01	0.011	0.02	0.02	0.005	29	0.01
2009		0.01	0.01	0.016	0.02	0.05	0.009	29	0.01
2008		0.01	0.02	0.019	0.02	0.05	0.008	29	0.01
2007		0.01	0.02	0.019	0.02	0.03	0.005	23	0.01
2006		0.02	0.02	*	0.02	0.03	0.002	25	0.01
2005		0.02	0.03	0.028	0.04	0.05	0.009	30	0.01
2004		0.03	0.04	0.052	0.08	0.35	0.066	24	0.01
2003		0.04	0.04	0.047	0.05	0.09	0.010	29	0.01
2002		0.04	0.06	*	0.07	0.08	0.012	23	0.01
2001		0.05	0.07	0.076	0.10	0.19	0.034	28	0.01
2000		0.06	0.09	0.108	0.16	0.26	0.051	29	0.01
1999		0.07	0.12	*	0.20	0.23	0.050	12	0.01
1998		0.04	0.10	0.172	0.38	0.80	0.170	28	0.01
1997		0.17	0.55	*	0.99	1.4	0.319	22	0.01
1996		0.19	0.50	0.676	1.22	3.0	0.583	28	0.01
1995		0.19	1.4	1.30	2.0	3.5	0.677	31	0.01
1994		0.19	1.25	1.58	3.41	5.4	1.29	30	0.01
1993		0.33	1.9	2.84	4.85	7.5	1.85	26	0.01
1992		1.1	3.1	3.40	4.9	9.9	1.75	31	0.01
1991		0.58	3.5	3.87	7.56	10	2.51	27	0.01
1990		1.3	2.6	3.32	6.48	9.7	2.07	29	0.01
1989		0.88	4.1	*	12.4	16	4.59	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.