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	Annual Toxics Summary Chico-Manzanita Avenue FAQs Sulfur 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		30	*	*	*	390	110	10	60
2011		30	270	292	470	880	176	31	60
2010		30	200	244	420	790	166	30	60
2009		30	270	335	660	1200	260	30	60
2008		64	310	350	540	810	174	31	20
2007		30	210	*	430	520	150	22	60
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		57	*	*	*	270	76.6	5	2
2002		96	310	371	650	870	188	31	2
2001		71	310	331	610	860	191	32	2
2000		95	310	360	640	920	202	31	2
1999		77	360	397	650	900	194	30	2
1998		110	270	393	610	1100	232	32	2
1997		55	260	291	570	780	200	30	2
1996		64	270	323	580	610	168	29	2
1995		50	240	378	730	1300	305	29	2
1994		81	320	323	530	780	181	30	2
1993		170	330	330	510	730	134	29	2
1992		140	410	*	750	920	223	16	2
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.