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	Annual Toxics Summary Mexicali-Calzada Benito Juarez FAQs Cobalt nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
2023		*	*	*	*	*	*	0	*
2022		*	*	*	*	*	*	0	*
2021		*	*	*	*	*	*	0	*
2020		*	*	*	*	*	*	0	*
2019		*	*	*	*	*	*	0	*
2018		*	*	*	*	*	*	0	*
2017		*	*	*	*	*	*	0	*
2016		*	*	*	*	*	*	0	*
2015		*	*	*	*	*	*	0	*
2014		*	*	*	*	*	*	0	*
2013		*	*	*	*	*	*	0	*
2012		*	*	*	*	*	*	0	*
2011		0.75	*	*	*	0.75	0.00	2	1.5
2010		0.75	*	*	*	0.75	0.00	3	1.5
2009		0.75	*	*	*	0.75	0.00	1	1.5
2008		*	*	*	*	*	*	0	*
2007		0.75	*	*	*	0.75	0.00	3	1.5
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		*	*	*	*	*	*	0	*
2002		*	*	*	*	*	*	0	*
2001		8	8	*	8	20	2.75	19	16
2000		8	8	8.42	8	18	1.83	30	16
1999		8	8	8.00	8	8	0.00	30	16
1998		8	8	*	8	21	3.12	23	16
1997		8	*	*	*	42	11.4	9	16
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.