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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 | 0.05 | 0.8 | * | 3.1 | 3.8 | 1.15 | 15 | 0.1 | * | |||||||||||||
2013 | 0.3 | 1.3 | 1.45 | 2.4 | 4.4 | 0.81 | 30 | 0.1 | 21 | |||||||||||||
2012 | 0.2 | 1.1 | 1.28 | 2.2 | 3.0 | 0.69 | 29 | 0.1 | 19 | |||||||||||||
2011 | 0.1 | 1.1 | 1.19 | 2.0 | 3.5 | 0.77 | 27 | 0.1 | 17 | |||||||||||||
2010 | 0.2 | 1.2 | 1.46 | 2.5 | 3.2 | 0.71 | 29 | 0.1 | 21 | |||||||||||||
2009 | 0.4 | 1.2 | 1.31 | 2.3 | 3.1 | 0.72 | 31 | 0.1 | 19 | |||||||||||||
2008 | 0.4 | 1.3 | 1.44 | 2.5 | 2.7 | 0.65 | 30 | 0.1 | 21 | |||||||||||||
2007 | 0.3 | 1.3 | 1.59 | 2.9 | 3.5 | 0.90 | 30 | 0.1 | 23 | |||||||||||||
2006 | 0.5 | 1.9 | 1.74 | 2.6 | 4.0 | 0.82 | 30 | 0.1 | 26 | |||||||||||||
2005 | 0.2 | 2.1 | 2.15 | 3.6 | 5.0 | 1.22 | 32 | 0.1 | 32 | |||||||||||||
2004 | 0.6 | 1.6 | 1.77 | 2.5 | 3.8 | 0.74 | 30 | 0.1 | 26 | |||||||||||||
2003 | 0.4 | 2.2 | * | 3.1 | 4.1 | 1.01 | 27 | 0.1 | * | |||||||||||||
2002 | 0.3 | 1.7 | 1.96 | 3.2 | 3.8 | 0.89 | 31 | 0.1 | 29 | |||||||||||||
2001 | 0.4 | 1.9 | 1.93 | 2.8 | 4.6 | 0.95 | 27 | 0.1 | 28 | |||||||||||||
2000 | 0.3 | 1.6 | 1.70 | 2.6 | 3.7 | 0.74 | 31 | 0.1 | 25 | |||||||||||||
1999 | 0.5 | 2.4 | 2.70 | 4.9 | 6.0 | 1.46 | 28 | 0.1 | 40 | |||||||||||||
1998 | 0.4 | 2.0 | 1.94 | 3.1 | 4.9 | 1.01 | 30 | 0.1 | 29 | |||||||||||||
1997 | 0.6 | 2.3 | * | 3.6 | 4.4 | 1.08 | 28 | 0.1 | * | |||||||||||||
1996 | 0.6 | 2.3 | * | 4.3 | 4.6 | 1.17 | 24 | 0.1 | * | |||||||||||||
1995 | 0.05 | 0.4 | 0.79 | 2.3 | 3.2 | 0.91 | 29 | 0.1 | 12 | |||||||||||||
1994 | 0.2 | 2.2 | 2.46 | 4.1 | 7.6 | 1.61 | 29 | 0.1 | 36 | |||||||||||||
1993 | 0.7 | 2.9 | 3.06 | 5.0 | 6.1 | 1.51 | 32 | 0.1 | 45 | |||||||||||||
1992 | 0.9 | 3.1 | * | 4.9 | 7.3 | 1.45 | 26 | 0.1 | * | |||||||||||||
1991 | 0.6 | 3.9 | 3.89 | 7.0 | 8.8 | 2.28 | 30 | 0.1 | 57 | |||||||||||||
1990 | 0.2 | 2.8 | 3.16 | 5.2 | 8.3 | 1.83 | 31 | 0.1 | 46 | |||||||||||||
1989 | 1.7 | 3.8 | * | 5.6 | 13 | 2.40 | 20 | 0.1 | * | |||||||||||||
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. |