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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 | 0.5 | 1.4 | * | 3.5 | 4.8 | 1.28 | 16 | 0.1 | * | |||||||||||||
2022 | 0.6 | 2.0 | 2.56 | 4.8 | 5.5 | 1.47 | 31 | 0.1 | 54 | |||||||||||||
2021 | 0.7 | 2.2 | * | 3.4 | 5.7 | 1.27 | 16 | 0.1 | * | |||||||||||||
2020 | 0.4 | * | * | * | 2.4 | 0.70 | 8 | 0.1 | * | |||||||||||||
2019 | 0.6 | 1.9 | 2.14 | 4.2 | 5.0 | 1.19 | 32 | 0.1 | 45 | |||||||||||||
2018 | 0.5 | 2.6 | 2.78 | 4.7 | 7.8 | 1.80 | 31 | 0.1 | 58 | |||||||||||||
2017 | 0.7 | 2.1 | 2.50 | 4.4 | 6.8 | 1.48 | 30 | 0.1 | 52 | |||||||||||||
2016 | 0.5 | 2.8 | * | 5.5 | 7.7 | 1.77 | 29 | 0.1 | * | |||||||||||||
2015 | 1.1 | 2.5 | 2.58 | 4.0 | 5.4 | 1.05 | 30 | 0.1 | 54 | |||||||||||||
2014 | 0.3 | 2.4 | 2.28 | 3.7 | 4.3 | 1.10 | 30 | 0.1 | 48 | |||||||||||||
2013 | 0.4 | 2.4 | 2.42 | 3.5 | 4.6 | 0.95 | 30 | 0.1 | 51 | |||||||||||||
2012 | 0.4 | 2.4 | 2.56 | 4.5 | 5.9 | 1.42 | 28 | 0.1 | 54 | |||||||||||||
2011 | 0.4 | 1.9 | 2.03 | 3.7 | 5.3 | 1.17 | 31 | 0.1 | 43 | |||||||||||||
2010 | 0.4 | 2.1 | 2.36 | 4.0 | 6.5 | 1.39 | 31 | 0.1 | 50 | |||||||||||||
2009 | 0.3 | 2.0 | 2.22 | 4.1 | 6.6 | 1.43 | 31 | 0.1 | 47 | |||||||||||||
2008 | 0.3 | 2.1 | 2.23 | 4.1 | 5.1 | 1.43 | 30 | 0.1 | 47 | |||||||||||||
2007 | 0.3 | 2.2 | 2.16 | 3.6 | 5.3 | 1.14 | 30 | 0.1 | 45 | |||||||||||||
2006 | 0.4 | 1.7 | 2.17 | 3.6 | 5.2 | 1.27 | 30 | 0.1 | 46 | |||||||||||||
2005 | 0.3 | 2.8 | 2.41 | 3.8 | 3.9 | 1.21 | 29 | 0.1 | 51 | |||||||||||||
2004 | 0.1 | 2.0 | 2.19 | 4.3 | 5.0 | 1.54 | 28 | 0.1 | 46 | |||||||||||||
2003 | 0.5 | 2.2 | 2.64 | 4.9 | 5.9 | 1.60 | 32 | 0.1 | 55 | |||||||||||||
2002 | 0.6 | 2.8 | * | 5.4 | 9.1 | 1.85 | 24 | 0.1 | * | |||||||||||||
2001 | 0.05 | 1.7 | * | 3.6 | 4.1 | 1.33 | 17 | 0.1 | * | |||||||||||||
2000 | 0.3 | 1.8 | 2.13 | 3.5 | 4.9 | 1.15 | 26 | 0.1 | 45 | |||||||||||||
1999 | 0.05 | 3.1 | * | 5.1 | 5.7 | 1.60 | 25 | 0.1 | * | |||||||||||||
1998 | 0.6 | 1.9 | 2.13 | 3.6 | 5.1 | 1.13 | 30 | 0.1 | 45 | |||||||||||||
1997 | 0.4 | 2.5 | 2.44 | 3.9 | 5.4 | 1.22 | 27 | 0.1 | 51 | |||||||||||||
1996 | 0.6 | 2.8 | 2.92 | 5.3 | 7.1 | 1.64 | 28 | 0.1 | 61 | |||||||||||||
1995 | 0.05 | 1.9 | 2.19 | 3.5 | 11 | 2.30 | 30 | 0.1 | 46 | |||||||||||||
1994 | 0.5 | 1.7 | 1.90 | 2.8 | 3.6 | 0.74 | 31 | 0.1 | 40 | |||||||||||||
1993 | 0.05 | 1.0 | 1.26 | 2.4 | 3.3 | 0.84 | 30 | 0.1 | 26 | |||||||||||||
1992 | 0.05 | 1.0 | * | 2.2 | 3.5 | 0.90 | 22 | 0.1 | * | |||||||||||||
1991 | 0.3 | 1.5 | 1.56 | 2.6 | 3.1 | 0.87 | 29 | 0.1 | 33 | |||||||||||||
1990 | 0.05 | 1.1 | 1.14 | 2.0 | 3.7 | 0.84 | 31 | 0.1 | 24 | |||||||||||||
1989 | 0.6 | 3.3 | * | 5.0 | 5.5 | 1.49 | 24 | 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. |