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	Annual Toxics Summary Azusa FAQs Manganese nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2025		*	*	*	*	*	*	0	*
2024		*	*	*	*	*	*	0	*
2023		*	*	*	*	*	*	0	*
2022		19.4	48.3	*	120	155	38.3	23	1.3
2021		8.0	77	*	140	179	45.3	23	1.3
2020		11.4	*	*	*	63	21.6	7	1.3
2019		2.1	44.9	49.1	81	102	23.4	31	1.3
2018		9.7	49	53.6	89.3	134	31.1	30	1.3
2017		9.8	52.5	51.7	87.4	129	27.7	30	1.3
2016		4.7	51.9	51.9	86.4	120	30.1	31	1.3
2015		1.9	57.9	59.4	87.8	182	38.1	30	1.3
2014		2.0	56.5	66.4	110	170	37.1	30	1.7
2013		0.5	48.5	*	98.1	130	36.1	28	1.0
2012		1.7	23	29.7	62.1	100	23.3	30	1.5
2011		1.7	25	*	55.2	77	18.5	20	1.5
2010		2.5	22.5	*	40.5	59	14.7	16	1.5
2009		2.8	24	30.7	60	89	22.0	31	1.5
2008		6.0	39	45.3	92.8	110	28.7	29	1.0
2007		2.5	37	36.3	68.4	78	20.4	27	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		20	*	*	*	88	27.4	5	1.0
2002		16	71.5	78.3	170	180	53.8	26	1.0
2001		1	85.5	80.6	150	170	50.1	28	2.0
2000		5.0	53.5	60.6	110	130	34.5	28	2.0
1999		100	*	*	*	100	2.68	1	2.0
1998		*	*	*	*	*	*	0	*
1997		*	*	*	*	*	*	0	*
1996		*	*	*	*	*	*	0	*
1995		*	*	*	*	*	*	0	*
1994		*	*	*	*	*	*	0	*
1993		*	*	*	*	*	*	0	*
1992		*	*	*	*	*	*	0	*
1991		*	*	*	*	*	*	0	*
1990		*	*	*	*	*	*	0	*
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.