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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 | 0.7 | 1.6 | * | 2.8 | 5.6 | 1.21 | 17 | 0.1 | * | |||||||||||||
2022 | 0.6 | 1.6 | 2.01 | 3.6 | 4.0 | 1.03 | 31 | 0.1 | 42 | |||||||||||||
2021 | 0.8 | 1.5 | * | 2.9 | 3.6 | 0.88 | 17 | 0.1 | * | |||||||||||||
2020 | 0.8 | * | * | * | 4.1 | 1.32 | 9 | 0.1 | * | |||||||||||||
2019 | 0.6 | 1.7 | 2.17 | 4.8 | 5.7 | 1.44 | 29 | 0.1 | 46 | |||||||||||||
2018 | 0.9 | 2.1 | 2.51 | 3.9 | 10 | 1.71 | 31 | 0.1 | 53 | |||||||||||||
2017 | 0.7 | 2.3 | 2.44 | 4.5 | 4.9 | 1.20 | 27 | 0.1 | 51 | |||||||||||||
2016 | 0.7 | 2.0 | 2.20 | 3.2 | 5.2 | 0.96 | 30 | 0.1 | 46 | |||||||||||||
2015 | 1.0 | 2.4 | 2.40 | 3.4 | 5.9 | 1.04 | 30 | 0.1 | 50 | |||||||||||||
2014 | 0.5 | 2.0 | 2.26 | 3.2 | 5.9 | 1.07 | 28 | 0.1 | 47 | |||||||||||||
2013 | 0.4 | 2.0 | 2.29 | 4.0 | 4.6 | 1.12 | 30 | 0.1 | 48 | |||||||||||||
2012 | 0.05 | 1.4 | 1.62 | 2.8 | 4.8 | 1.16 | 30 | 0.1 | 34 | |||||||||||||
2011 | 0.4 | 1.8 | 1.99 | 3.3 | 4.9 | 1.07 | 32 | 0.1 | 42 | |||||||||||||
2010 | 0.3 | 1.6 | 1.94 | 3.5 | 6.3 | 1.42 | 29 | 0.1 | 41 | |||||||||||||
2009 | 0.2 | 1.3 | 1.75 | 3.1 | 5.1 | 1.09 | 30 | 0.1 | 37 | |||||||||||||
2008 | 0.4 | 1.6 | 1.69 | 3.1 | 4.3 | 0.91 | 31 | 0.1 | 35 | |||||||||||||
2007 | 0.7 | 1.8 | 1.90 | 3.4 | 4.6 | 0.96 | 30 | 0.1 | 40 | |||||||||||||
2006 | 0.5 | 1.8 | 1.88 | 3.1 | 5.0 | 0.98 | 30 | 0.1 | 39 | |||||||||||||
2005 | 0.4 | 1.7 | 1.71 | 3.4 | 4.2 | 1.12 | 28 | 0.1 | 36 | |||||||||||||
2004 | 0.3 | 2.0 | 2.13 | 4.3 | 5.8 | 1.43 | 29 | 0.1 | 45 | |||||||||||||
2003 | 0.6 | 2.2 | 2.79 | 4.8 | 9.5 | 1.88 | 30 | 0.1 | 59 | |||||||||||||
2002 | 0.3 | * | * | * | 5.0 | 1.74 | 5 | 0.1 | * | |||||||||||||
2001 | * | * | * | * | * | * | 0 | * | * | |||||||||||||
2000 | * | * | * | * | * | * | 0 | * | * | |||||||||||||
1999 | * | * | * | * | * | * | 0 | * | * | |||||||||||||
1998 | * | * | * | * | * | * | 0 | * | * | |||||||||||||
1997 | * | * | * | * | * | * | 0 | * | * | |||||||||||||
1996 | * | * | * | * | * | * | 0 | * | * | |||||||||||||
1995 | * | * | * | * | * | * | 0 | * | * | |||||||||||||
1994 | * | * | * | * | * | * | 0 | * | * | |||||||||||||
1993 | * | * | * | * | * | * | 0 | * | * | |||||||||||||
1992 | * | * | * | * | * | * | 0 | * | * | |||||||||||||
1991 | * | * | * | * | * | * | 0 | * | * | |||||||||||||
1990 | * | * | * | * | * | * | 0 | * | * | |||||||||||||
1989 | * | * | * | * | * | * | 0 | * | * | |||||||||||||
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. |