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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 |
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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 | 0.5 | 1.1 | * | 1.5 | 2.9 | 0.56 | 17 | 0.1 | * | |||||||||||||
2009 | 0.05 | 0.9 | 1.36 | 3.1 | 4.5 | 1.09 | 31 | 0.1 | 29 | |||||||||||||
2008 | 0.3 | 1.2 | 1.38 | 2.0 | 4.6 | 0.94 | 31 | 0.1 | 29 | |||||||||||||
2007 | 0.3 | 1.2 | 1.30 | 2.2 | 3.4 | 0.70 | 29 | 0.1 | 27 | |||||||||||||
2006 | 0.4 | 1.4 | 1.52 | 2.3 | 2.4 | 0.55 | 30 | 0.1 | 32 | |||||||||||||
2005 | 0.3 | 1.0 | 1.21 | 2.5 | 3.1 | 0.77 | 31 | 0.1 | 25 | |||||||||||||
2004 | 0.1 | 1.2 | 1.46 | 2.7 | 4.9 | 1.05 | 29 | 0.1 | 31 | |||||||||||||
2003 | 0.4 | 1.9 | 2.15 | 4.3 | 6.8 | 1.53 | 31 | 0.1 | 45 | |||||||||||||
2002 | 0.7 | 2.8 | * | 5.3 | 8.8 | 1.96 | 25 | 0.1 | * | |||||||||||||
2001 | 0.5 | 1.6 | * | 3.1 | 20 | 3.56 | 28 | 0.1 | * | |||||||||||||
2000 | 0.5 | 1.4 | * | 2.9 | 3.8 | 0.95 | 22 | 0.1 | * | |||||||||||||
1999 | 0.9 | 1.9 | * | 4.2 | 6.1 | 1.33 | 26 | 0.1 | * | |||||||||||||
1998 | 0.05 | 1.7 | 1.96 | 4.2 | 6.3 | 1.35 | 28 | 0.1 | 41 | |||||||||||||
1997 | 0.6 | 1.8 | 1.79 | 2.5 | 3.6 | 0.70 | 30 | 0.1 | 38 | |||||||||||||
1996 | 0.8 | 1.9 | 2.16 | 3.2 | 6.4 | 1.23 | 31 | 0.1 | 45 | |||||||||||||
1995 | 0.5 | 2.0 | 2.02 | 4.2 | 5.9 | 1.39 | 29 | 0.1 | 42 | |||||||||||||
1994 | 0.6 | 1.6 | 1.78 | 2.8 | 4.6 | 0.91 | 31 | 0.1 | 37 | |||||||||||||
1993 | 0.2 | 1.2 | 1.37 | 2.8 | 3.8 | 0.94 | 27 | 0.1 | 29 | |||||||||||||
1992 | 0.2 | 1.2 | 1.30 | 2.2 | 3.4 | 0.79 | 29 | 0.1 | 27 | |||||||||||||
1991 | 0.4 | 1.6 | 1.98 | 4.1 | 5.0 | 1.31 | 29 | 0.1 | 42 | |||||||||||||
1990 | 0.5 | 1.8 | 1.84 | 3.0 | 3.6 | 0.89 | 29 | 0.1 | 39 | |||||||||||||
1989 | 0.7 | 2.4 | 2.93 | 5.2 | 8.1 | 1.92 | 25 | 0.1 | 62 | |||||||||||||
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. |