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	Annual Toxics Summary North Long Beach 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		0.02	0.02	*	0.13	0.29	0.078	22	0.04	*
2012		0.02	0.05	0.074	0.16	0.31	0.071	29	0.04	80
2011		0.02	0.07	0.101	0.23	0.33	0.090	30	0.04	109
2010		0.02	0.05	0.083	0.16	0.32	0.071	26	0.04	89
2009		0.02	0.07	0.098	0.22	0.33	0.088	30	0.04	106
2008		0.02	0.06	0.094	0.18	0.36	0.086	30	0.04	102
2007		0.02	0.06	0.092	0.21	0.37	0.087	29	0.04	99
2006		0.02	0.07	0.113	0.26	0.57	0.122	30	0.04	122
2005		0.02	0.09	*	0.26	0.56	0.128	26	0.04	*
2004		0.02	0.14	0.144	0.28	0.35	0.095	31	0.04	156
2003		0.02	0.09	0.142	0.36	0.45	0.127	27	0.04	153
2002		0.02	0.14	0.198	0.48	0.59	0.169	26	0.04	215
2001		0.06	0.16	*	0.52	0.94	0.230	26	0.04	*
2000		0.06	0.17	0.278	0.64	0.84	0.219	28	0.04	300
1999		0.07	0.18	0.323	0.54	1.2	0.256	24	0.04	349
1998		0.08	0.25	0.339	0.66	0.94	0.230	30	0.04	366
1997		0.02	0.22	0.364	0.79	0.93	0.276	31	0.04	394
1996		0.11	0.24	*	0.62	1.0	0.241	22	0.04	*
1995		0.13	0.34	0.448	0.83	1.2	0.289	31	0.04	485
1994		0.11	0.31	0.447	0.75	1.5	0.318	30	0.04	483
1993		0.14	0.35	0.575	1.1	1.8	0.450	32	0.04	621
1992		0.10	0.40	0.523	1.02	1.5	0.377	30	0.04	565
1991		0.10	0.28	0.439	0.94	1.5	0.336	29	0.04	475
1990		0.24	0.45	0.592	1.2	1.6	0.384	31	0.04	640
1989		0.23	0.38	*	1.05	1.7	0.412	20	0.04	*

	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.