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	Annual Toxics Summary Upland-San Bernardino Road 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	*	*
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	*	*
1999		*	*	*	*	*	*	0	*	*
1998		*	*	*	*	*	*	0	*	*
1997		0.08	0.24	0.254	0.38	0.61	0.111	31	0.04	274
1996		0.11	0.24	0.257	0.36	0.45	0.093	28	0.04	278
1995		0.14	0.30	0.312	0.48	0.68	0.127	31	0.04	337
1994		0.16	0.31	0.336	0.52	0.64	0.122	31	0.04	363
1993		0.10	0.35	0.391	0.63	0.82	0.180	29	0.04	422
1992		0.11	0.29	0.308	0.47	0.57	0.130	27	0.04	332
1991		0.10	0.32	0.341	0.53	0.59	0.152	28	0.04	368
1990		0.16	0.31	0.348	0.50	0.70	0.131	27	0.04	376
1989		0.15	0.39	0.432	0.59	0.87	0.178	22	0.04	466

	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.