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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
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		*	*	*	*	*	*	0	*	*
2012		*	*	*	*	*	*	0	*	*
2011		4.4	*	*	*	4.4	1.51	1	0.1	*
2010		0.3	*	*	*	4.9	1.51	8	0.1	*
2009		6.4	*	*	*	6.4	1.06	1	0.1	*
2008		1.1	*	*	*	3.1	1.06	3	0.1	*
2007		1.0	*	*	*	1.0	1.97	1	0.1	*
2006		0.5	*	*	*	6.8	1.97	9	0.1	*
2005		0.6	3.1	*	7.3	7.7	2.49	17	0.1	*
2004		1.6	*	*	*	10	3.03	6	0.1	*
2003		*	*	*	*	*	*	0	*	*
2002		*	*	*	*	*	*	0	*	*
2001		*	*	*	*	*	*	0	*	*
2000		0.5	3.5	*	8.6	9.8	2.52	18	0.1	*
1999		1.0	5.8	6.07	12	17	4.29	29	0.1	127
1998		0.3	5.7	*	11	16	3.69	25	0.1	*
1997		7.0	*	*	*	13	4.24	2	0.1	*
1996		*	*	*	*	*	*	0	*	*
1995		*	*	*	*	*	*	0	*	*
1994		*	*	*	*	*	*	0	*	*
1993		*	*	*	*	*	*	0	*	*
1992		*	*	*	*	*	*	0	*	*
1991		*	*	*	*	*	*	0	*	*
1990		*	*	*	*	*	*	0	*	*
1989		*	*	*	*	*	*	0	*	*

1989-1995 data and 1996-2025 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.