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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 | 1.3 | * | * | * | 4.2 | 1.30 | 4 | 0.1 | * | |||||||||||||
2013 | 1.1 | 2.5 | 2.58 | 3.8 | 5.1 | 0.99 | 31 | 0.1 | 54 | |||||||||||||
2012 | 0.7 | 2.4 | 2.57 | 3.8 | 5.9 | 1.15 | 30 | 0.1 | 54 | |||||||||||||
2011 | 0.9 | 2.5 | 2.34 | 3.3 | 5.2 | 0.99 | 31 | 0.1 | 49 | |||||||||||||
2010 | 0.8 | 2.2 | 2.31 | 3.3 | 5.3 | 0.95 | 29 | 0.1 | 49 | |||||||||||||
2009 | 0.7 | 2.4 | 2.55 | 4.2 | 5.8 | 1.27 | 31 | 0.1 | 54 | |||||||||||||
2008 | 0.6 | 2.4 | 2.46 | 3.9 | 5.2 | 1.19 | 30 | 0.1 | 52 | |||||||||||||
2007 | 1.0 | 2.2 | 2.65 | 3.7 | 5.1 | 0.97 | 29 | 0.1 | 56 | |||||||||||||
2006 | 0.5 | 2.4 | 2.28 | 3.3 | 4.8 | 1.00 | 32 | 0.1 | 48 | |||||||||||||
2005 | 0.8 | 2.8 | 2.76 | 4.0 | 5.0 | 1.16 | 29 | 0.1 | 58 | |||||||||||||
2004 | 0.4 | 2.3 | 2.45 | 3.5 | 6.2 | 1.11 | 28 | 0.1 | 52 | |||||||||||||
2003 | 0.8 | 2.8 | 3.05 | 4.5 | 5.8 | 1.31 | 29 | 0.1 | 64 | |||||||||||||
2002 | 1.0 | 3.2 | 3.41 | 5.3 | 9.4 | 1.87 | 30 | 0.1 | 72 | |||||||||||||
2001 | 0.8 | 2.6 | 2.63 | 4.2 | 5.0 | 1.13 | 29 | 0.1 | 55 | |||||||||||||
2000 | 0.6 | 2.1 | 2.32 | 3.5 | 5.9 | 1.13 | 30 | 0.1 | 49 | |||||||||||||
1999 | 0.05 | 2.8 | 2.84 | 4.9 | 6.8 | 1.60 | 29 | 0.1 | 60 | |||||||||||||
1998 | 0.8 | 2.2 | * | 5.2 | 6.4 | 1.63 | 24 | 0.1 | * | |||||||||||||
1997 | 0.05 | 3.1 | * | 4.6 | 5.7 | 1.30 | 24 | 0.1 | * | |||||||||||||
1996 | 0.05 | 3.0 | 3.14 | 5.8 | 6.8 | 1.64 | 29 | 0.1 | 66 | |||||||||||||
1995 | 0.7 | 2.5 | * | 4.7 | 6.1 | 1.50 | 28 | 0.1 | * | |||||||||||||
1994 | 0.9 | 2.0 | * | 4.1 | 5.3 | 1.15 | 28 | 0.1 | * | |||||||||||||
1993 | 0.1 | 1.9 | 2.06 | 3.4 | 5.2 | 1.13 | 30 | 0.1 | 43 | |||||||||||||
1992 | 0.05 | 1.3 | 1.42 | 2.5 | 5.4 | 1.19 | 27 | 0.1 | 30 | |||||||||||||
1991 | 0.05 | 1.5 | 1.76 | 2.8 | 3.5 | 0.84 | 29 | 0.1 | 37 | |||||||||||||
1990 | 0.5 | 1.9 | 2.01 | 3.3 | 4.8 | 1.13 | 31 | 0.1 | 42 | |||||||||||||
1989 | 1.6 | 3.9 | * | 8.2 | 9.8 | 2.51 | 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. |