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	Annual Toxics Summary Fresno-Garland FAQs 1,3-Butadiene 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		0.02	0.02	*	0.08	0.11	0.028	20	0.04	*
2022		0.02	0.02	*	0.08	0.23	0.054	19	0.04	*
2021		0.02	0.02	*	0.04	0.10	0.024	17	0.04	*
2020		0.02	*	*	*	0.08	0.024	7	0.04	*
2019		0.02	0.02	0.040	0.11	0.13	0.037	29	0.04	43
2018		0.02	0.02	0.050	0.10	0.20	0.047	30	0.04	55
2017		0.02	0.02	0.055	0.10	0.22	0.052	30	0.04	59
2016		0.02	0.02	0.060	0.18	0.27	0.070	31	0.04	65
2015		0.02	0.02	0.057	0.13	0.26	0.061	30	0.04	62
2014		0.02	0.02	0.064	0.20	0.28	0.076	30	0.04	69
2013		0.02	0.02	0.092	0.20	0.37	0.093	31	0.04	100
2012		0.02	0.02	0.047	0.14	0.18	0.049	29	0.04	51
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.