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	Annual Toxics Summary Concord-2975 Treat Blvd FAQs Titanium 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	*
2010		*	*	*	*	*	*	0	*
2009		*	*	*	*	*	*	0	*
2008		*	*	*	*	*	*	0	*
2007		*	*	*	*	*	*	0	*
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		*	*	*	*	*	*	0	*
2002		*	*	*	*	*	*	0	*
2001		*	*	*	*	*	*	0	*
2000		5	*	*	*	51	19.4	4	10
1999		15	35	45.5	76	210	39.0	27	10
1998		5	26	*	56	67	18.6	19	10
1997		16	35	*	58	60	12.7	22	10
1996		5	31	36.2	100	130	36.7	26	10
1995		5	40	49.1	96	160	39.3	27	10
1994		5	50	47.6	91	110	29.0	29	10
1993		5	40	51.0	100	150	36.5	27	10
1992		5	42	*	60	90	18.7	22	10
1991		16	49	60.8	96	170	36.5	27	10
1990		16	48	*	110	140	37.2	16	10
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.