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	Annual Toxics Summary Azusa FAQs Titanium 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		37	120	*	380	606	141	23	2.69
2021		15	240	*	430	551	152	23	2.69
2020		8	*	*	*	105	37.1	7	2.69
2019		4	100	109	210	300	74.7	31	2.69
2018		20	110	127	230	337	84.0	30	2.69
2017		17	130	121	210	249	67.6	30	2.69
2016		13	120	126	230	319	82.8	31	2.69
2015		7	140	146	230	537	108	30	2.69
2014		5	120	141	250	440	93.9	30	1.9
2013		5	67	*	170	210	62.4	28	1.5
2012		4.5	23	33.2	63	100	26.1	30	9
2011		4.5	24	*	78	92	25.9	17	9
2010		4.5	26	*	59	100	23.3	16	9
2009		4.5	23	36.5	80	110	29.1	31	9
2008		34	170	214	420	700	155	29	1
2007		4.5	46	52.5	94	120	29.6	27	9
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		47	*	*	*	230	88.7	5	3
2002		47	160	278	550	680	177	26	3
2001		5	250	291	420	1500	276	28	10
2000		5	190	204	410	610	148	28	10
1999		390	*	*	*	390	2.2	1	10
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.