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	Annual Toxics Summary Riverside-Rubidoux FAQs Sulfur 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		*	*	*	*	*	*	0	*
2021		*	*	*	*	*	*	0	*
2020		*	*	*	*	*	*	0	*
2019		*	*	*	*	*	*	0	*
2018		*	*	*	*	*	*	0	*
2017		*	*	*	*	*	*	0	*
2016		*	*	*	*	*	*	0	*
2015		*	*	*	*	*	*	0	*
2014		*	*	*	*	*	*	0	*
2013		170	930	*	1400	1600	464	29	51
2012		81	540	753	1400	1800	488	28	60
2011		30	490	787	1700	2000	616	29	60
2010		30	630	*	1400	1700	450	28	60
2009		95	910	1030	2100	2500	698	31	60
2008		170	920	947	1700	2000	539	30	20
2007		140	750	*	1900	2500	732	19	60
2006		*	*	*	*	*	*	0	*
2005		*	*	*	*	*	*	0	*
2004		*	*	*	*	*	*	0	*
2003		470	*	*	*	1500	399	5	2
2002		280	970	1030	1600	2200	489	31	2
2001		83	1200	1080	1800	2300	589	30	2
2000		150	1200	1000	1600	1800	518	29	2
1999		39	1000	1020	1800	2100	616	28	2
1998		370	1200	*	1800	2100	573	12	2
1997		610	*	*	*	610	504	1	2
1996		130	890	925	1600	2200	504	27	2
1995		240	970	1100	1700	2300	548	30	2
1994		190	980	1110	2100	3400	747	30	2
1993		180	1200	1340	2300	2900	821	28	2
1992		100	1300	1290	2300	2700	802	30	2
1991		11	1200	1260	2300	3000	805	30	2
1990		120	1100	*	2200	2500	766	15	2
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.