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

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2025		5.2	18.7	*	44.3	52.7	14.4	16	1.3
2024		2.1	32.9	*	54.7	85.9	20.2	27	0.1
2023		1.8	28.7	*	42.3	50.5	11.8	25	1.3
2022		3.2	27.6	*	50.4	78.9	17.0	27	1.3
2021		3.3	35.1	*	50.6	72.3	18.2	21	1.3
2020		14.5	*	*	*	44.2	11.4	6	1.3
2019		2.1	26.3	29.6	59.4	100	23.8	29	1.3
2018		0.65	30.3	34.9	66.5	82.2	21.4	30	1.3
2017		4.3	26.6	31.4	53.8	75.6	16.8	29	1.3
2016		6.9	36.5	38.7	58.6	107	21.3	28	1.3
2015		4.1	25.2	*	48.6	79.3	16.3	28	1.3
2014		5.4	39	37.0	55	62	15.0	29	1.7
2013		4.1	32	*	52.6	110	21.6	29	1.0
2012		4.9	35	*	49	58	16.7	27	1.5
2011		0.75	20	23.5	45	52	15.7	31	1.5
2010		1.6	24.5	22.8	33.6	59	12.4	28	1.5
2009		11	28	29.1	47	50	11.7	31	1.5
2008		3.7	42	42.9	69.7	110	23.8	30	1.0
2007		6.7	37	*	71.6	88	23.4	23	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		6.0	*	*	*	55	20.9	5	1.0
2002		10	63	65.2	99	130	31.6	31	1.0
2001		1	61.5	56.9	100	130	34.6	30	2.0
2000		6.0	44	50.7	85.8	110	27.5	29	2.0
1999		7.0	53.5	49.2	91.5	120	29.7	28	2.0
1998		17	49	*	67.9	76	18.5	12	2.0
1997		11	*	*	*	11	25.0	1	2.0
1996		3.0	49	43.1	72.4	80	25.0	27	2.0
1995		2.0	47.5	54.3	100	130	37.1	30	2.0
1994		6.0	56	57.4	91.7	120	29.4	30	2.0
1993		1	53	57.4	110	130	39.6	28	2.0
1992		4.0	58.5	54.2	93.2	120	34.6	30	2.0
1991		1	48.5	61.8	110	170	42.5	30	2.0
1990		8.0	53	50.0	94	150	32.9	29	1.0
1989		7.0	60	69.0	130	157	36.4	53	1.0

	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.