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	Annual Toxics Summary Modesto-14th Street 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
2024		*	*	*	*	*	*	0	*	*
2023		*	*	*	*	*	*	0	*	*
2022		*	*	*	*	*	*	0	*	*
2021		*	*	*	*	*	*	0	*	*
2020		*	*	*	*	*	*	0	*	*
2019		*	*	*	*	*	*	0	*	*
2018		*	*	*	*	*	*	0	*	*
2017		*	*	*	*	*	*	0	*	*
2016		*	*	*	*	*	*	0	*	*
2015		*	*	*	*	*	*	0	*	*
2014		*	*	*	*	*	*	0	*	*
2013		*	*	*	*	*	*	0	*	*
2012		*	*	*	*	*	*	0	*	*
2011		*	*	*	*	*	*	0	*	*
2010		*	*	*	*	*	*	0	*	*
2009		*	*	*	*	*	*	0	*	*
2008		*	*	*	*	*	*	0	*	*
2007		*	*	*	*	*	*	0	*	*
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		*	*	*	*	*	*	0	*	*
2003		*	*	*	*	*	*	0	*	*
2002		*	*	*	*	*	*	0	*	*
2001		*	*	*	*	*	*	0	*	*
2000		0.02	*	*	*	0.49	0.168	5	0.04	*
1999		0.04	0.11	0.162	0.38	0.59	0.148	31	0.04	175
1998		0.02	0.20	0.260	0.67	0.90	0.239	31	0.04	281
1997		0.02	0.14	0.208	0.46	0.73	0.177	30	0.04	225
1996		0.02	0.13	0.236	0.45	1.0	0.197	31	0.04	255
1995		0.07	0.22	0.298	0.59	0.95	0.226	30	0.04	322
1994		0.10	0.19	0.293	0.50	1.1	0.216	31	0.04	317
1993		0.07	0.24	0.348	0.73	1.4	0.342	30	0.04	376
1992		0.02	0.17	0.224	0.46	1.2	0.244	30	0.04	242
1991		0.02	0.19	0.353	0.97	1.4	0.385	30	0.04	382
1990		0.06	0.22	0.379	0.81	1.2	0.320	31	0.04	409
1989		0.02	0.30	0.402	0.86	1.0	0.290	26	0.04	434

	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.