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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 | 0.4 | 0.7 | * | 0.8 | 1.3 | 0.27 | 12 | 0.1 | * | |||||||||||||
2022 | 0.2 | 1.0 | 1.37 | 2.0 | 5.6 | 1.30 | 30 | 0.1 | 20 | |||||||||||||
2021 | 0.4 | 1.1 | * | 1.7 | 3.8 | 0.77 | 16 | 0.1 | * | |||||||||||||
2020 | 0.4 | * | * | * | 1.8 | 0.45 | 7 | 0.1 | * | |||||||||||||
2019 | 0.2 | 0.6 | 0.86 | 1.7 | 2.6 | 0.58 | 31 | 0.1 | 13 | |||||||||||||
2018 | 0.2 | 0.9 | 1.10 | 1.8 | 3.3 | 0.65 | 28 | 0.1 | 16 | |||||||||||||
2017 | 0.5 | 0.9 | 1.14 | 1.9 | 2.6 | 0.56 | 30 | 0.1 | 17 | |||||||||||||
2016 | 0.5 | 1.3 | 1.37 | 2.2 | 2.9 | 0.57 | 31 | 0.1 | 20 | |||||||||||||
2015 | 0.5 | 1.3 | 1.41 | 2.5 | 2.8 | 0.66 | 30 | 0.1 | 21 | |||||||||||||
2014 | 0.3 | 1.1 | 1.30 | 2.2 | 3.3 | 0.69 | 30 | 0.1 | 19 | |||||||||||||
2013 | 0.3 | 0.9 | 1.15 | 2.1 | 3.7 | 0.65 | 32 | 0.1 | 17 | |||||||||||||
2012 | 0.05 | 1.0 | 1.12 | 1.9 | 2.1 | 0.57 | 29 | 0.1 | 16 | |||||||||||||
2011 | 0.05 | 1.0 | 1.10 | 1.9 | 3.3 | 0.71 | 30 | 0.1 | 16 | |||||||||||||
2010 | 0.2 | 0.8 | * | 1.7 | 2.5 | 0.55 | 16 | 0.1 | * | |||||||||||||
2009 | 0.3 | 1.0 | 1.22 | 2.1 | 3.6 | 0.80 | 29 | 0.1 | 18 | |||||||||||||
2008 | 0.2 | 0.9 | 1.14 | 2.4 | 3.1 | 0.72 | 27 | 0.1 | 17 | |||||||||||||
2007 | 0.2 | 0.8 | 0.94 | 1.9 | 3.1 | 0.70 | 30 | 0.1 | 14 | |||||||||||||
2006 | 0.2 | 1.1 | 1.19 | 2.1 | 2.8 | 0.71 | 30 | 0.1 | 17 | |||||||||||||
2005 | 0.3 | 1.5 | 1.84 | 3.2 | 4.3 | 1.11 | 29 | 0.1 | 27 | |||||||||||||
2004 | 0.3 | 1.1 | 1.24 | 2.4 | 3.0 | 0.81 | 27 | 0.1 | 18 | |||||||||||||
2003 | 0.05 | 1.3 | 1.39 | 2.4 | 4.4 | 0.96 | 27 | 0.1 | 20 | |||||||||||||
2002 | 0.05 | 1.0 | 1.30 | 2.2 | 3.5 | 0.87 | 28 | 0.1 | 19 | |||||||||||||
2001 | 0.2 | 1.4 | 1.45 | 2.4 | 3.7 | 0.81 | 29 | 0.1 | 21 | |||||||||||||
2000 | 0.05 | 0.7 | 0.84 | 1.3 | 2.9 | 0.63 | 30 | 0.1 | 12 | |||||||||||||
1999 | 0.05 | 1.1 | 1.43 | 2.5 | 5.4 | 1.24 | 26 | 0.1 | 21 | |||||||||||||
1998 | 0.3 | 1.3 | * | 2.4 | 3.6 | 0.81 | 17 | 0.1 | * | |||||||||||||
1997 | 1.0 | 1.7 | * | 3.0 | 4.5 | 0.87 | 21 | 0.1 | * | |||||||||||||
1996 | 0.2 | 2.5 | 2.33 | 3.7 | 4.5 | 1.11 | 30 | 0.1 | 34 | |||||||||||||
1995 | 0.05 | 0.7 | 1.28 | 2.9 | 5.7 | 1.31 | 31 | 0.1 | 19 | |||||||||||||
1994 | 0.7 | 2.1 | 2.35 | 4.0 | 7.0 | 1.35 | 28 | 0.1 | 35 | |||||||||||||
1993 | 0.6 | 2.9 | 2.89 | 4.5 | 5.9 | 1.49 | 29 | 0.1 | 42 | |||||||||||||
1992 | 0.05 | 2.5 | 2.50 | 4.1 | 6.6 | 1.62 | 25 | 0.1 | 37 | |||||||||||||
1991 | 0.05 | 2.9 | 2.78 | 5.5 | 7.2 | 1.90 | 29 | 0.1 | 41 | |||||||||||||
1990 | 0.8 | 2.3 | 2.68 | 4.4 | 5.5 | 1.31 | 31 | 0.1 | 39 | |||||||||||||
1989 | 0.1 | 2.5 | 3.00 | 5.7 | 9.4 | 1.93 | 48 | 0.1 | 44 | |||||||||||||
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. |