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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 | 0.9 | * | * | * | 4.2 | 1.04 | 9 | 0.1 | * | |||||||||||||
2020 | 0.5 | * | * | * | 3.9 | 1.28 | 7 | 0.1 | * | |||||||||||||
2019 | 0.7 | 1.7 | 2.09 | 4.2 | 6.1 | 1.45 | 30 | 0.1 | 44 | |||||||||||||
2018 | 0.8 | 2.1 | 2.67 | 5.3 | 6.9 | 1.57 | 32 | 0.1 | 56 | |||||||||||||
2017 | 0.9 | 2.8 | 2.75 | 4.7 | 6.1 | 1.38 | 31 | 0.1 | 58 | |||||||||||||
2016 | 0.8 | 2.3 | 2.47 | 4.4 | 4.9 | 1.22 | 32 | 0.1 | 52 | |||||||||||||
2015 | 0.9 | 2.4 | 2.58 | 4.1 | 5.5 | 1.15 | 31 | 0.1 | 54 | |||||||||||||
2014 | 0.5 | 2.2 | 2.35 | 3.9 | 6.1 | 1.23 | 31 | 0.1 | 49 | |||||||||||||
2013 | 0.8 | 2.5 | 2.39 | 4.1 | 5.3 | 1.11 | 32 | 0.1 | 50 | |||||||||||||
2012 | 0.3 | 1.6 | 2.02 | 4.1 | 5.1 | 1.27 | 30 | 0.1 | 42 | |||||||||||||
2011 | 0.5 | 1.9 | 2.13 | 4.1 | 4.6 | 1.20 | 32 | 0.1 | 45 | |||||||||||||
2010 | 0.4 | 1.3 | 1.96 | 3.7 | 7.2 | 1.55 | 29 | 0.1 | 41 | |||||||||||||
2009 | 0.6 | 1.5 | 2.02 | 3.6 | 5.9 | 1.35 | 31 | 0.1 | 42 | |||||||||||||
2008 | 0.5 | 1.8 | 1.96 | 3.2 | 5.1 | 1.11 | 33 | 0.1 | 41 | |||||||||||||
2007 | 0.4 | 1.9 | 2.02 | 3.7 | 4.1 | 0.98 | 32 | 0.1 | 42 | |||||||||||||
2006 | 0.4 | 1.8 | 2.16 | 3.5 | 7.6 | 1.39 | 31 | 0.1 | 45 | |||||||||||||
2005 | 0.5 | 1.7 | 1.94 | 3.4 | 4.0 | 1.02 | 36 | 0.1 | 41 | |||||||||||||
2004 | 0.4 | 1.7 | 1.79 | 3.0 | 7.7 | 1.37 | 32 | 0.1 | 38 | |||||||||||||
2003 | 0.2 | 1.6 | 1.91 | 3.4 | 5.8 | 1.32 | 37 | 0.1 | 40 | |||||||||||||
2002 | 0.6 | 1.8 | 2.07 | 3.6 | 6.1 | 1.25 | 32 | 0.1 | 43 | |||||||||||||
2001 | 0.6 | 1.3 | 1.48 | 2.4 | 3.8 | 0.73 | 33 | 0.1 | 31 | |||||||||||||
2000 | 0.3 | 1.5 | 1.61 | 2.5 | 4.2 | 0.84 | 30 | 0.1 | 34 | |||||||||||||
1999 | 1.3 | 2.4 | 2.68 | 3.9 | 6.1 | 1.12 | 30 | 0.1 | 56 | |||||||||||||
1998 | 0.05 | 2.0 | 2.33 | 4.4 | 6.9 | 1.47 | 32 | 0.1 | 49 | |||||||||||||
1997 | 0.7 | 2.2 | 2.24 | 3.3 | 4.4 | 0.89 | 30 | 0.1 | 47 | |||||||||||||
1996 | 0.9 | 2.0 | 2.35 | 3.9 | 5.7 | 1.28 | 33 | 0.1 | 49 | |||||||||||||
1995 | 0.6 | 1.5 | * | 4.3 | 4.8 | 1.41 | 28 | 0.1 | * | |||||||||||||
1994 | 0.3 | 1.5 | 1.56 | 2.8 | 4.1 | 0.85 | 37 | 0.1 | 33 | |||||||||||||
1993 | 0.1 | 1.2 | 1.38 | 2.6 | 3.8 | 0.92 | 29 | 0.1 | 29 | |||||||||||||
1992 | 0.3 | 1.0 | 1.24 | 2.5 | 3.8 | 0.86 | 31 | 0.1 | 26 | |||||||||||||
1991 | 0.05 | 1.6 | 1.88 | 2.7 | 5.6 | 1.04 | 31 | 0.1 | 39 | |||||||||||||
1990 | 0.05 | 1.6 | 1.81 | 3.2 | 4.2 | 0.99 | 32 | 0.1 | 38 | |||||||||||||
1989 | 1.0 | 3.3 | 3.58 | 6.0 | 7.4 | 1.85 | 24 | 0.1 | 75 | |||||||||||||
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. |