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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 | 1.3 | 2.3 | * | 3.8 | 4.6 | 0.93 | 12 | 0.1 | * | |||||||||||||
2022 | 0.9 | 3.2 | 4.44 | 6.8 | 18 | 3.86 | 30 | 0.1 | 93 | |||||||||||||
2021 | 1.5 | 3.3 | * | 5.5 | 7.1 | 1.51 | 16 | 0.1 | * | |||||||||||||
2020 | 1.2 | * | * | * | 3.9 | 0.89 | 7 | 0.1 | * | |||||||||||||
2019 | 0.9 | 2.6 | 2.95 | 5.0 | 7.3 | 1.59 | 31 | 0.1 | 62 | |||||||||||||
2018 | 0.5 | 3.3 | 3.73 | 6.2 | 7.4 | 1.75 | 28 | 0.1 | 78 | |||||||||||||
2017 | 1.4 | 3.2 | 3.52 | 5.4 | 7.3 | 1.51 | 30 | 0.1 | 74 | |||||||||||||
2016 | 1.7 | 3.4 | 3.67 | 5.8 | 6.8 | 1.38 | 31 | 0.1 | 77 | |||||||||||||
2015 | 1.6 | 3.2 | 3.45 | 4.8 | 7.3 | 1.30 | 30 | 0.1 | 72 | |||||||||||||
2014 | 0.6 | 3.0 | 3.14 | 4.9 | 5.6 | 1.32 | 30 | 0.1 | 66 | |||||||||||||
2013 | 1.2 | 2.8 | 3.07 | 4.2 | 7.5 | 1.14 | 32 | 0.1 | 64 | |||||||||||||
2012 | 0.1 | 3.0 | 3.06 | 4.7 | 6.1 | 1.30 | 29 | 0.1 | 64 | |||||||||||||
2011 | 0.2 | 3.0 | 3.01 | 4.2 | 6.4 | 1.39 | 30 | 0.1 | 63 | |||||||||||||
2010 | 0.7 | 2.5 | * | 3.2 | 4.9 | 0.88 | 16 | 0.1 | * | |||||||||||||
2009 | 0.7 | 3.2 | 3.03 | 4.5 | 6.9 | 1.41 | 29 | 0.1 | 64 | |||||||||||||
2008 | 2.1 | 6.9 | 7.73 | 14 | 18 | 4.55 | 27 | 0.1 | 162 | |||||||||||||
2007 | 1.9 | 5.5 | 5.87 | 9.1 | 17 | 3.00 | 30 | 0.1 | 123 | |||||||||||||
2006 | 2.3 | 5.8 | 6.69 | 11.1 | 12 | 2.95 | 30 | 0.1 | 140 | |||||||||||||
2005 | 2.0 | 6.2 | 6.64 | 11.2 | 14 | 3.07 | 29 | 0.1 | 140 | |||||||||||||
2004 | 1.7 | 5.1 | 5.69 | 11.8 | 15 | 3.74 | 27 | 0.1 | 119 | |||||||||||||
2003 | 0.8 | 3.3 | 3.79 | 6.1 | 8.9 | 1.83 | 27 | 0.1 | 80 | |||||||||||||
2002 | 1.1 | 3.1 | 4.32 | 8.3 | 11 | 2.72 | 28 | 0.1 | 91 | |||||||||||||
2001 | 0.4 | 4.0 | 4.30 | 6.3 | 12 | 2.33 | 29 | 0.1 | 90 | |||||||||||||
2000 | 0.2 | 2.0 | 2.42 | 4.8 | 5.8 | 1.63 | 30 | 0.1 | 51 | |||||||||||||
1999 | 0.3 | 3.4 | 3.88 | 7.5 | 12 | 2.85 | 26 | 0.1 | 82 | |||||||||||||
1998 | 0.6 | 3.3 | * | 5.8 | 8.1 | 1.85 | 17 | 0.1 | * | |||||||||||||
1997 | 2.5 | 4.4 | * | 6.2 | 12 | 2.11 | 21 | 0.1 | * | |||||||||||||
1996 | 1.6 | 5.2 | 5.87 | 9.4 | 13 | 2.76 | 30 | 0.1 | 123 | |||||||||||||
1995 | 0.05 | 3.1 | 4.13 | 7.8 | 13 | 3.29 | 31 | 0.1 | 87 | |||||||||||||
1994 | 1.1 | 3.0 | 3.54 | 5.8 | 12 | 2.19 | 28 | 0.1 | 74 | |||||||||||||
1993 | 0.8 | 3.4 | 3.23 | 4.3 | 6.9 | 1.36 | 29 | 0.1 | 68 | |||||||||||||
1992 | 0.05 | 2.0 | 2.30 | 4.0 | 6.2 | 1.51 | 25 | 0.1 | 48 | |||||||||||||
1991 | 0.05 | 2.4 | 3.00 | 5.6 | 6.9 | 1.91 | 29 | 0.1 | 63 | |||||||||||||
1990 | 0.7 | 2.8 | 3.50 | 7.0 | 8.1 | 2.21 | 31 | 0.1 | 74 | |||||||||||||
1989 | 0.3 | 4.4 | 4.72 | 8.4 | 16 | 3.45 | 48 | 0.1 | 99 | |||||||||||||
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. |