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	Annual Statewide Toxics Summary Benzene FAQs parts per billion

Read About New Estimated Risk

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit	Estimated Risk
2017		0.025	0.17	*	0.39	1.0	0.15	341	0.05	*
2016		0.025	0.21	0.267	0.53	2.2	0.219	427	0.05	70
2015		0.025	0.2	0.253	0.49	1.5	0.198	412	0.05	66
2014		0.025	0.19	0.268	0.49	3.0	0.247	387	0.05	70
2013		0.05	0.23	0.297	0.57	1.5	0.228	469	0.05	77
2012		0.06	0.23	0.311	0.55	3.5	0.268	467	0.05	81
2011		0.025	0.24	0.322	0.7	1.6	0.26	490	0.05	84
2010		0.05	0.25	0.318	0.55	1.8	0.229	473	0.05	83
2009		0.025	0.25	0.339	0.69	2.3	0.281	512	0.05	88
2008		0.06	0.25	0.34	0.67	2.2	0.257	518	0.05	89
2007		0.05	0.25	0.375	0.81	2.8	0.34	495	0.05	97
2006		0.05	0.29	0.41	0.84	4.9	0.387	504	0.05	107
2005		0.05	0.3	0.478	1.0	7.3	0.516	510	0.05	124
2004		0.06	0.36	0.461	0.9	2.5	0.354	503	0.05	120
2003		0.1	0.42	0.565	1.0	4.4	0.454	503	0.05	147
2002		0.08	0.48	0.625	1.3	7.3	0.61	459	0.05	163
2001		0.08	0.45	0.608	1.2	4.2	0.543	499	0.05	158
2000		0.1	0.5	0.71	1.6	4.9	0.64	526	0.2	186
1999		0.1	0.6	0.85	1.7	9.9	0.80	595	0.2	221
1998		0.1	0.6	0.86	1.7	4.6	0.71	617	0.2	224
1997		0.1	0.6	0.85	1.8	6.9	0.84	571	0.2	222
1996		0.25	0.25	0.93	1.9	7.4	0.95	633	0.5	241
1995		0.25	1.2	1.31	2.7	11	1.08	616	0.5	340
1994		0.25	1.4	1.58	2.9	7.8	1.12	607	0.5	410
1993		0.25	1.3	1.50	3.0	5.5	1.10	596	0.5	390
1992		0.25	1.5	1.71	3.4	6.5	1.19	598	0.5	445
1991		0.25	1.7	2.14	4.3	8.4	1.52	581	0.5	556
1990		0.25	2.2	2.57	4.5	10	1.66	579	0.5	669
1989		0.25	2.3	2.97	5.4	16	2.21	437	0.5	773

	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.