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	Annual Toxics Summary Riverside-Rubidoux FAQs Potassium 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		210	*	*	*	1200	413	5	5
2002		310	1600	1770	3000	3300	965	31	5
2001		46	1500	1430	2500	3200	866	30	3
2000		170	1200	1360	2400	2900	811	29	3
1999		180	1400	1480	2600	4200	969	28	3
1998		590	1400	*	2200	2500	676	12	3
1997		280	*	*	*	280	671	1	3
1996		70	1200	1130	2000	2200	671	27	3
1995		170	1200	1230	2400	2400	780	30	3
1994		190	1400	1480	2500	3700	866	30	3
1993		91	1800	1490	2900	3200	1000	28	3
1992		140	1300	1450	2600	3100	997	30	3
1991		14	1100	1450	2800	3500	987	30	3
1990		380	1600	*	2300	3400	770	15	3
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.