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	Annual Toxics Summary Azusa FAQs Chromium 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		10	25	*	45	54	12.9	23	8.51
2021		4.255	33	*	51	82	18.4	23	8.51
2020		4.255	*	*	*	20	5.4	7	8.51
2019		10	25	*	49	83	17.7	28	8.51
2018		4.255	29	30.8	47	74	16.5	30	8.51
2017		4.255	29	28.8	47	65	13.9	30	8.51
2016		4.255	18	20.1	30	80	15.1	31	8.51
2015		4.255	26	24.7	42	60	16.8	30	8.51
2014		3.4	10	12.6	23	33	8.1	30	6.8
2013		4	12	*	30	40	11.0	28	3
2012		1.5	8	9.2	18	22	5.3	30	3
2011		1.5	6	*	12	15	3.6	18	3
2010		3	7	*	12	17	4.0	16	3
2009		1.5	4	4.8	8	13	3.2	31	3
2008		*	*	*	*	*	*	0	*
2007		1.5	7	*	14	25	5.8	25	3
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		2	*	*	*	27	9.2	5	2
2002		1	15	18.5	49	66	18.5	26	2
2001		1	21	26.2	62	71	22.8	28	2
2000		1	15	16.1	33	40	11.8	28	2
1999		19	*	*	*	19	2.4	1	2
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.