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	Annual Toxics Summary Riverside-Rubidoux FAQs Lead nanograms per cubic meter

Read About Estimated Risk

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit	Estimated Risk
2025		0.65	3.3	*	5.9	7.7	1.90	16	1.3	*
2024		0.7	4.8	*	8.6	10	2.62	27	0.6	*
2023		0.65	4.8	*	6.9	9.3	2.01	25	1.3	*
2022		0.65	4.4	*	8.1	14.4	3.29	27	1.3	*
2021		0.65	4.4	*	9.8	12.1	3.33	21	1.3	*
2020		2.4	*	*	*	11.1	3.06	6	1.3	*
2019		0.65	4.5	4.93	9.4	15	3.36	29	1.3	0.2
2018		0.65	4.5	5.22	9.3	13	2.97	30	1.3	0.2
2017		0.65	4.0	*	7.0	16.3	3.05	26	1.3	*
2016		1.5	4.9	5.54	9.9	12.7	2.80	28	1.3	0.2
2015		0.65	4.2	*	6.2	13.6	2.68	28	1.3	*
2014		0.85	5.7	5.74	9.4	15	3.29	29	1.7	0.2
2013		0.5	4.9	*	10.1	23	4.75	29	1.0	*
2012		2.3	5.9	*	10	28	5.26	27	1.5	*
2011		0.75	6.2	*	9.8	13	3.21	21	1.5	*
2010		0.75	6.1	*	17	31	6.93	23	1.5	*
2009		1.6	8.0	8.38	12	20	4.18	31	1.5	0.3
2008		*	*	*	*	*	*	0	*	*
2007		2.8	9.5	*	18	21	5.40	16	1.5	*
2006		*	*	*	*	*	*	0	*	*
2005		*	*	*	*	*	*	0	*	*
2004		*	*	*	*	*	*	0	*	*
2003		1.5	*	*	*	19	7.39	5	3.0	*
2002		1.5	13	13.0	20	32	6.41	31	3.0	0.4
2001		2	13	13.4	22.4	31	7.43	30	4.0	0.5
2000		2	11	12.8	22	30	7.17	29	4.0	0.4
1999		2	11	16.8	46.8	100	21.6	28	4.0	0.6
1998		2	12.5	*	16.8	36	8.77	12	4.0	*
1997		6.0	*	*	*	6.0	8.79	1	4.0	*
1996		5.0	13	15.3	25.8	39	8.79	27	4.0	0.5
1995		2	14	20.4	34.8	110	20.4	30	4.0	0.7
1994		5.0	21	22.8	31.2	66	12.0	30	4.0	0.8
1993		2	18.5	19.7	32.8	45	12.6	28	4.0	0.7
1992		2	21.5	19.1	34.1	41	10.8	30	4.0	0.7
1991		2	27	31.5	60.3	110	23.7	30	4.0	1
1990		6.0	26	26.4	42.4	68	14.4	29	1.0	0.9
1989		11	46	45.2	66.8	122	23.2	53	1.0	2

	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.