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	Annual Toxics Summary Concord-2975 Treat Blvd 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		0.05	*	*	*	0.42	0.137	5	0.04	*
1999		0.02	0.13	0.155	0.36	0.49	0.126	30	0.04	168
1998		0.02	0.14	0.192	0.45	0.56	0.176	31	0.04	208
1997		0.02	0.11	0.176	0.37	0.50	0.149	30	0.04	190
1996		0.02	0.10	0.149	0.36	0.54	0.131	31	0.04	161
1995		0.07	0.19	0.242	0.44	0.74	0.166	30	0.04	261
1994		0.02	0.16	0.232	0.40	1.0	0.196	32	0.04	251
1993		0.06	0.20	0.305	0.70	0.77	0.231	30	0.04	329
1992		0.02	0.18	0.253	0.67	0.72	0.228	31	0.04	273
1991		0.02	0.14	0.265	0.59	0.87	0.246	29	0.04	287
1990		0.02	0.20	0.315	0.68	1.1	0.280	28	0.04	341
1989		0.08	0.24	0.341	0.65	0.87	0.248	21	0.04	369

	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.