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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
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		0.4	*	*	*	0.4	1.47	1	0.1	*
2010		0.05	0.2	*	3.2	4.5	1.47	14	0.1	*
2009		1.3	*	*	*	1.3	3.25	1	0.1	*
2008		0.7	*	*	*	5.3	3.25	2	0.1	*
2007		2.9	*	*	*	2.9	0.81	1	0.1	*
2006		0.3	0.8	*	1.7	3.4	0.81	15	0.1	*
2005		0.4	0.9	*	1.9	2.9	0.69	16	0.1	*
2004		0.5	1.4	*	2.5	4.3	1.05	11	0.1	*
2003		1.2	*	*	*	2.8	0.65	5	0.1	*
2002		0.5	1.8	*	3.3	4.1	0.95	18	0.1	*
2001		0.2	1.6	1.76	2.9	5.0	1.04	29	0.1	37
2000		0.7	1.5	*	2.8	3.8	0.86	19	0.1	*
1999		0.05	1.9	2.13	3.8	6.5	1.59	28	0.1	45
1998		0.7	1.6	*	3.5	5.7	1.41	12	0.1	*
1997		0.05	1.3	*	2.8	3.5	0.89	16	0.1	*
1996		*	*	*	*	*	*	0	*	*
1995		*	*	*	*	*	*	0	*	*
1994		*	*	*	*	*	*	0	*	*
1993		*	*	*	*	*	*	0	*	*
1992		*	*	*	*	*	*	0	*	*
1991		*	*	*	*	*	*	0	*	*
1990		*	*	*	*	*	*	0	*	*
1989		*	*	*	*	*	*	0	*	*

1989-1995 data and 1996-2024 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.