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	Annual Toxics Summary North Long Beach FAQs Carbon Tetrachloride 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
2022		*	*	*	*	*	*	0	*	*
2021		*	*	*	*	*	*	0	*	*
2020		*	*	*	*	*	*	0	*	*
2019		*	*	*	*	*	*	0	*	*
2018		*	*	*	*	*	*	0	*	*
2017		*	*	*	*	*	*	0	*	*
2016		*	*	*	*	*	*	0	*	*
2015		*	*	*	*	*	*	0	*	*
2014		*	*	*	*	*	*	0	*	*
2013		0.07	0.08	*	0.09	0.09	0.006	22	0.02	*
2012		0.08	0.08	0.084	0.09	0.10	0.005	29	0.02	65
2011		0.07	0.09	0.088	0.10	0.10	0.009	30	0.02	67
2010		0.07	0.09	0.088	0.10	0.10	0.008	26	0.02	67
2009		*	*	*	*	*	*	0	*	*
2008		*	*	*	*	*	*	0	*	*
2007		*	*	*	*	*	*	0	*	*
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		0.08	*	*	*	0.09	0.005	4	0.02	*
2003		0.08	0.09	0.092	0.11	0.11	0.009	26	0.02	71
2002		0.07	0.09	0.092	0.10	0.11	0.009	26	0.02	70
2001		0.07	0.09	*	0.10	0.10	0.007	26	0.02	*
2000		0.09	0.09	0.097	0.12	0.13	0.013	28	0.02	74
1999		0.08	*	*	*	0.12	0.016	9	0.02	*
1998		0.09	0.11	0.118	0.15	0.17	0.022	30	0.02	91
1997		0.09	0.11	*	0.12	0.15	0.015	22	0.02	*
1996		0.07	0.08	*	0.08	0.09	0.005	22	0.02	*
1995		0.07	0.10	0.099	0.11	0.13	0.010	31	0.02	76
1994		0.07	0.11	*	0.12	0.13	0.017	19	0.02	*
1993		0.08	0.10	*	0.12	0.15	0.015	29	0.02	*
1992		0.11	0.12	*	0.14	0.15	0.012	20	0.02	*
1991		0.11	0.13	0.129	0.15	0.15	0.013	28	0.02	99
1990		0.11	0.14	0.139	0.15	0.20	0.016	31	0.02	107
1989		0.08	0.12	*	0.15	0.16	0.021	19	0.02	*

	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.