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	Annual Toxics Summary Upland-San Bernardino Road FAQs Benzene 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
2025		*	*	*	*	*	*	0	*	*
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	*	*
2001		*	*	*	*	*	*	0	*	*
2000		*	*	*	*	*	*	0	*	*
1999		*	*	*	*	*	*	0	*	*
1998		*	*	*	*	*	*	0	*	*
1997		0.5	1.0	1.11	1.4	2.1	0.37	30	0.2	289
1996		0.25	1.1	1.11	1.9	2.2	0.53	28	0.5	288
1995		0.25	1.7	1.62	2.6	3.1	0.71	31	0.5	420
1994		1.0	2.0	2.15	3.1	3.6	0.61	31	0.5	559
1993		0.25	2.0	1.92	2.7	4.2	0.85	29	0.5	500
1992		1.2	2.1	2.14	2.9	3.6	0.64	27	0.5	557
1991		1.0	2.7	2.70	3.8	5.3	1.01	28	0.5	703
1990		1.2	2.6	2.73	3.6	5.4	0.93	27	0.5	711
1989		1.5	3.1	3.44	5.2	6.4	1.20	20	0.5	894

	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.