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	Annual Toxics Summary Fresno-Garland 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
2023		0.06	0.08	*	0.08	0.08	0.005	20	0.02	*
2022		0.05	0.07	*	0.08	0.08	0.008	19	0.02	*
2021		0.06	0.07	*	0.07	0.08	0.006	17	0.02	*
2020		0.07	*	*	*	0.08	0.005	7	0.02	*
2019		0.06	0.07	0.073	0.08	0.09	0.006	29	0.02	56
2018		0.06	0.07	0.076	0.09	0.10	0.009	30	0.02	58
2017		0.07	0.09	*	0.10	0.12	0.011	24	0.02	*
2016		0.08	0.10	0.099	0.11	0.13	0.012	31	0.02	76
2015		0.08	0.10	0.098	0.11	0.13	0.013	30	0.02	75
2014		0.08	0.10	0.095	0.10	0.11	0.009	29	0.02	73
2013		0.07	0.08	0.084	0.09	0.09	0.007	31	0.02	64
2012		0.05	0.08	0.080	0.09	0.10	0.009	29	0.02	62
2011		*	*	*	*	*	*	0	*	*
2010		*	*	*	*	*	*	0	*	*
2009		*	*	*	*	*	*	0	*	*
2008		*	*	*	*	*	*	0	*	*
2007		*	*	*	*	*	*	0	*	*
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		*	*	*	*	*	*	0	*	*
2003		*	*	*	*	*	*	0	*	*
2002		*	*	*	*	*	*	0	*	*
2001		*	*	*	*	*	*	0	*	*
2000		*	*	*	*	*	*	0	*	*
1999		*	*	*	*	*	*	0	*	*
1998		*	*	*	*	*	*	0	*	*
1997		*	*	*	*	*	*	0	*	*
1996		*	*	*	*	*	*	0	*	*
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.