California Home	ARB:	Home	Search	Site Map				Contact Us

	Annual Toxics Summary North Long Beach 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		0.005	0.005	*	0.005	0.005	0.000	22	0.01
2012		0.005	0.005	0.007	0.01	0.01	0.003	29	0.01
2011		0.005	0.01	0.010	0.02	0.02	0.005	30	0.01
2010		0.005	0.08	0.078	0.12	0.19	0.038	26	0.01
2009		0.10	0.19	0.200	0.28	0.31	0.055	30	0.01
2008		0.03	0.09	0.095	0.16	0.18	0.052	30	0.01
2007		0.06	0.08	0.094	0.14	0.20	0.035	29	0.01
2006		0.02	0.13	0.117	0.17	0.23	0.056	30	0.01
2005		0.02	0.02	*	0.05	0.05	0.011	26	0.01
2004		0.03	0.05	0.048	0.06	0.09	0.012	31	0.01
2003		0.04	0.05	0.055	0.07	0.08	0.012	27	0.01
2002		0.04	0.05	0.056	0.07	0.13	0.018	26	0.01
2001		0.04	0.05	*	0.07	0.08	0.012	26	0.01
2000		0.04	0.09	0.097	0.17	0.18	0.040	28	0.01
1999		0.06	0.10	*	0.28	0.41	0.114	12	0.01
1998		0.04	0.07	0.103	0.17	0.45	0.084	29	0.01
1997		0.06	0.24	0.310	0.61	0.79	0.203	30	0.01
1996		0.08	0.27	*	0.49	1.6	0.320	22	0.01
1995		0.15	0.62	0.877	1.5	3.6	0.849	31	0.01
1994		0.08	0.79	1.24	2.95	4.9	1.18	30	0.01
1993		0.16	0.84	2.23	5.48	11	2.56	32	0.01
1992		0.63	1.85	2.62	5.76	11	2.37	30	0.01
1991		0.31	1.1	1.83	3.62	6.7	1.45	29	0.01
1990		0.39	1.8	2.96	6.5	9.0	2.58	31	0.01
1989		0.59	1.5	*	10.53	18	4.77	18	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.