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	Annual Toxics Summary San Jose-4th 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		0.09	*	*	*	0.78	0.234	9	0.04	*
2001		0.02	0.12	*	0.33	0.74	0.158	28	0.04	*
2000		0.02	0.11	0.193	0.52	1.0	0.226	30	0.04	208
1999		0.05	0.14	0.227	0.46	0.73	0.179	30	0.04	245
1998		0.08	0.24	0.293	0.66	0.90	0.227	31	0.04	316
1997		0.02	0.18	0.287	0.60	0.88	0.231	30	0.04	310
1996		0.02	0.19	0.311	0.77	1.2	0.285	31	0.04	337
1995		0.08	0.30	0.348	0.61	1.3	0.246	30	0.04	376
1994		0.10	0.25	0.385	0.81	1.6	0.340	31	0.04	416
1993		0.08	0.31	0.485	1.3	1.6	0.447	29	0.04	525
1992		0.02	0.26	0.436	1.1	1.6	0.413	31	0.04	471
1991		0.02	0.25	0.385	0.95	1.2	0.342	28	0.04	416
1990		0.10	0.33	0.549	1.33	1.9	0.515	28	0.04	594
1989		0.11	0.45	0.570	0.93	2.3	0.577	23	0.04	616

	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.