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	Annual Toxics Summary Calexico-Ethel Street FAQs Manganese nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2025		34.8	*	*	*	34.8	27.4	1	1.3
2024		5.3	36.4	39.8	69.6	139	27.4	30	0.27
2023		11.5	29.7	36.5	45.2	179	28.4	31	1.3
2022		10.3	30.7	34.8	59.2	78.2	15.6	30	1.3
2021		11.8	32.9	*	58.9	79.5	19.5	23	1.3
2020		10.8	*	*	*	71.9	20.4	7	1.3
2019		3.7	40.5	*	73.9	115	27.2	24	1.3
2018		12.6	33.2	*	49.1	86.9	15.8	23	1.3
2017		6.7	32.2	36.6	59.7	111	23.2	30	1.3
2016		6.6	41.8	46.0	69.1	188	34.4	29	1.3
2015		11	46.4	47.2	70.8	81.5	19.4	30	1.3
2014		3.6	32.5	42.1	82.7	110	27.8	28	1.7
2013		8.2	27	*	66	120	25.8	27	1.0
2012		7.6	25	26.6	46.4	65	15.6	27	1.5
2011		2.4	22	23.7	44.4	63	15.5	27	1.5
2010		7.3	22	*	38.8	63	13.8	23	1.5
2009		1.9	23	24.6	51	60	16.2	31	1.5
2008		8.5	27	26.7	41	68	14.0	30	1.0
2007		7.3	33	39.6	65.3	120	27.1	28	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		18	*	*	*	74	21.5	5	1.0
2002		9.0	47	45.1	67	91	21.4	29	1.0
2001		5.0	38.5	37.8	54	76	17.2	30	2.0
2000		14	36	*	64.6	71	17.5	29	2.0
1999		12	34	35.9	68.2	91	21.0	27	2.0
1998		19	33	38.1	59.4	110	19.6	27	2.0
1997		12	45	*	80.1	99	24.5	24	2.0
1996		12	35.5	38.8	65.3	82	19.0	28	2.0
1995		13	57	*	93.2	160	38.6	15	2.0
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.