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Read About Estimated Risk

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit	Estimated Risk
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		*	*	*	*	*	*	0	*	*
2002		*	*	*	*	*	*	0	*	*
2001		*	*	*	*	*	*	0	*	*
2000		*	*	*	*	*	*	0	*	*
1999		*	*	*	*	*	*	0	*	*
1998		*	*	*	*	*	*	0	*	*
1997		0.2	*	*	*	1.1	0.30	8	0.1	*
1996		0.2	0.5	0.59	0.9	1.7	0.34	28	0.1	9
1995		0.05	0.3	0.36	0.7	1.6	0.35	29	0.1	5
1994		0.4	0.8	0.92	1.2	3.0	0.50	29	0.1	13
1993		0.3	0.8	*	1.8	2.3	0.57	29	0.1	*
1992		0.3	0.8	0.78	1.2	1.9	0.39	30	0.1	11
1991		0.3	0.7	*	1.6	3.2	0.64	30	0.1	*
1990		0.6	0.8	*	1.1	2.7	0.47	17	0.1	*
1989		0.4	1.2	1.25	2.1	3.6	0.73	24	0.1	18

1989-1995 data and 1996-2023 data represent different methods and should not be compared.
See Report on a Parallel Carbonyl Monitoring Study Using C18 and Silica Gel Sampling Media for details.
	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.