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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 | 0.1 | 0.2 | * | 0.5 | 0.7 | 0.17 | 16 | 0.1 | * | |||||||||||||
2022 | 0.1 | 0.3 | 0.41 | 0.7 | 1.8 | 0.36 | 32 | 0.1 | 6 | |||||||||||||
2021 | 0.05 | 0.3 | * | 0.8 | 1.2 | 0.32 | 17 | 0.1 | * | |||||||||||||
2020 | 0.2 | * | * | * | 1.0 | 0.31 | 9 | 0.1 | * | |||||||||||||
2019 | 0.1 | 0.2 | 0.38 | 0.8 | 1.5 | 0.34 | 30 | 0.1 | 6 | |||||||||||||
2018 | 0.05 | 0.4 | 0.58 | 0.8 | 4.0 | 0.73 | 29 | 0.1 | 9 | |||||||||||||
2017 | 0.2 | 0.5 | 0.69 | 1.2 | 2.5 | 0.51 | 30 | 0.1 | 10 | |||||||||||||
2016 | 0.3 | 0.6 | 0.98 | 1.5 | 8.5 | 1.48 | 30 | 0.1 | 14 | |||||||||||||
2015 | 0.3 | 0.5 | 0.66 | 1.1 | 1.8 | 0.38 | 30 | 0.1 | 10 | |||||||||||||
2014 | 0.2 | 0.3 | 0.50 | 0.8 | 2.0 | 0.42 | 30 | 0.1 | 7 | |||||||||||||
2013 | 0.1 | 0.4 | 0.56 | 1.2 | 1.8 | 0.46 | 31 | 0.1 | 8 | |||||||||||||
2012 | 0.05 | 0.3 | 0.50 | 1.1 | 2.0 | 0.42 | 30 | 0.1 | 7 | |||||||||||||
2011 | 0.2 | 0.6 | 0.68 | 1.1 | 1.7 | 0.38 | 30 | 0.1 | 10 | |||||||||||||
2010 | 0.2 | 0.5 | 0.69 | 1.3 | 2.5 | 0.55 | 30 | 0.1 | 10 | |||||||||||||
2009 | 0.1 | 0.5 | 0.59 | 1.0 | 1.9 | 0.37 | 31 | 0.1 | 9 | |||||||||||||
2008 | 0.1 | 0.3 | 0.39 | 0.7 | 1.1 | 0.23 | 30 | 0.1 | 6 | |||||||||||||
2007 | 0.1 | 0.3 | 0.44 | 1.2 | 1.6 | 0.42 | 29 | 0.1 | 6 | |||||||||||||
2006 | 0.05 | 0.4 | 0.54 | 1.0 | 1.8 | 0.44 | 27 | 0.1 | 8 | |||||||||||||
2005 | 0.2 | 0.5 | 0.65 | 1.1 | 2.3 | 0.45 | 30 | 0.1 | 9 | |||||||||||||
2004 | 0.1 | 0.5 | 0.69 | 1.2 | 1.9 | 0.47 | 30 | 0.1 | 10 | |||||||||||||
2003 | 0.2 | 0.5 | 0.68 | 1.1 | 2.8 | 0.49 | 30 | 0.1 | 10 | |||||||||||||
2002 | 0.2 | 0.5 | 0.54 | 0.9 | 1.7 | 0.33 | 30 | 0.1 | 8 | |||||||||||||
2001 | 0.1 | 0.5 | 0.57 | 1.0 | 2.2 | 0.44 | 31 | 0.1 | 8 | |||||||||||||
2000 | 0.2 | 0.5 | * | 1.2 | 1.8 | 0.42 | 16 | 0.1 | * | |||||||||||||
1999 | 0.3 | 0.4 | * | 0.7 | 1.3 | 0.24 | 21 | 0.1 | * | |||||||||||||
1998 | 0.2 | 0.5 | 0.54 | 1.1 | 1.5 | 0.34 | 31 | 0.1 | 8 | |||||||||||||
1997 | 0.3 | 0.7 | 0.75 | 1.2 | 2.2 | 0.45 | 30 | 0.1 | 11 | |||||||||||||
1996 | 0.3 | 0.6 | * | 1.4 | 2.6 | 0.51 | 27 | 0.1 | * | |||||||||||||
1995 | 0.05 | 0.3 | 0.40 | 0.8 | 3.0 | 0.56 | 29 | 0.1 | 6 | |||||||||||||
1994 | 0.2 | 0.8 | 0.98 | 1.6 | 2.6 | 0.61 | 31 | 0.1 | 14 | |||||||||||||
1993 | 0.4 | 1.2 | * | 2.1 | 2.5 | 0.59 | 27 | 0.1 | * | |||||||||||||
1992 | 0.3 | 0.7 | * | 1.1 | 1.3 | 0.27 | 16 | 0.1 | * | |||||||||||||
1991 | 0.3 | 0.9 | * | 2.1 | 4.6 | 0.96 | 23 | 0.1 | * | |||||||||||||
1990 | 0.4 | 0.9 | 1.32 | 3.2 | 3.7 | 1.00 | 28 | 0.1 | 19 | |||||||||||||
1989 | 0.3 | 1.3 | 1.86 | 3.7 | 6.6 | 1.53 | 25 | 0.1 | 27 | |||||||||||||
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. |