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

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2025		21	52	*	80	90	23.2	16	9.98
2024		18	62	*	120	164	37.5	25	2.1
2023		4.99	51	*	72	99	19.2	25	9.98
2022		4.99	48	*	95	156	31.7	27	9.98
2021		22	55	*	89	187	38.6	21	9.98
2020		30	*	*	*	133	40.8	6	9.98
2019		4.99	44	50.5	93	190	36.0	29	9.98
2018		17	43	*	83	145	28.0	24	9.98
2017		11	49	54.6	89	169	31.9	29	10
2016		26	65	66.7	110	149	31.9	28	10
2015		14	48	*	77	171	32.1	28	10
2014		21	66	60.5	93	120	28.8	29	8.4
2013		20	53	*	92	100	25.2	24	5.2
2012		24	48	*	72	89	18.5	20	9
2011		11	45	*	74	91	21.9	22	9
2010		23	48	*	81	94	21.4	15	9
2009		4.5	56	*	85	110	22.6	28	9
2008		*	*	*	*	*	*	0	*
2007		17	49	*	100	140	35.4	15	3
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		28	*	*	*	200	80.7	5	1
2002		12	84	82.3	140	250	50.2	31	1
2001		8	64	82.7	150	280	61.1	30	2
2000		15	61	70.6	120	260	50.5	29	2
1999		4	55	70.5	160	310	69.9	28	2
1998		25	61	*	98	150	32.0	12	2
1997		24	*	*	*	24	54.9	1	2
1996		20	58	70.2	130	250	54.9	27	2
1995		9	67	95.3	150	360	87.6	30	2
1994		9	68	83.7	110	390	70.2	30	2
1993		9	64	64.2	110	150	38.8	28	2
1992		9	68	62.6	98	160	36.0	30	2
1991		3	53	60.6	92	200	40.0	30	2
1990		10	53	*	86	89	22.9	15	2
1989		*	*	*	*	*	*	0	*

	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.