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	Annual Statewide Toxics Summary Potassium FAQs nanograms per cubic meter

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit
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		65	340	*	830	2300	375	86	5
2002		13	520	724	1600	3300	612	491	5
2001		22	450	600	1300	9800	642	505	3
2000		35	470	615	1400	4800	563	472	3
1999		30	440	655	1300	16000	924	565	3
1998		11	420	572	1200	7900	632	561	3
1997		39	430	560	1100	3700	502	557	3
1996		33	410	533	1100	2900	457	595	3
1995		57	420	575	1200	3500	540	602	3
1994		70	450	549	1000	3700	431	585	3
1993		58	450	576	1100	3200	508	575	3
1992		13	460	598	1100	6300	620	554	3
1991		1.5	460	653	1300	5800	596	567	3
1990		55	700	*	1800	5700	689	309	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.