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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 | 0.6 | 2.0 | * | 5.0 | 7.1 | 1.76 | 17 | 0.1 | * | |||||||||||||
2022 | 0.05 | 3.1 | 3.45 | 6.2 | 7.5 | 1.82 | 31 | 0.1 | 72 | |||||||||||||
2021 | 1.5 | 3.6 | * | 5.2 | 9.9 | 2.10 | 15 | 0.1 | * | |||||||||||||
2020 | 1.6 | * | * | * | 3.6 | 0.76 | 6 | 0.1 | * | |||||||||||||
2019 | 1.1 | 3.0 | 3.19 | 5.9 | 7.6 | 1.78 | 28 | 0.1 | 67 | |||||||||||||
2018 | 1.1 | 3.9 | 4.21 | 7.0 | 11 | 2.46 | 29 | 0.1 | 88 | |||||||||||||
2017 | 0.2 | 3.0 | 3.35 | 6.4 | 7.4 | 1.82 | 30 | 0.1 | 70 | |||||||||||||
2016 | 0.3 | 3.8 | 3.64 | 5.8 | 7.7 | 1.93 | 28 | 0.1 | 76 | |||||||||||||
2015 | 1.5 | 3.4 | 3.52 | 5.2 | 6.7 | 1.32 | 29 | 0.1 | 74 | |||||||||||||
2014 | 1.1 | 3.9 | 3.56 | 5.3 | 6.5 | 1.56 | 30 | 0.1 | 75 | |||||||||||||
2013 | 1.1 | 3.5 | 3.57 | 5.5 | 7.5 | 1.61 | 33 | 0.1 | 75 | |||||||||||||
2012 | 0.5 | 3.5 | 3.70 | 6.5 | 9.4 | 2.03 | 30 | 0.1 | 78 | |||||||||||||
2011 | 0.7 | 2.7 | 3.05 | 5.8 | 7.6 | 1.91 | 31 | 0.1 | 64 | |||||||||||||
2010 | 0.6 | 3.7 | 3.44 | 5.0 | 9.0 | 1.77 | 29 | 0.1 | 72 | |||||||||||||
2009 | 0.4 | 2.9 | 3.12 | 4.9 | 7.9 | 1.77 | 31 | 0.1 | 65 | |||||||||||||
2008 | 0.7 | 2.5 | 2.88 | 5.4 | 7.1 | 1.72 | 28 | 0.1 | 61 | |||||||||||||
2007 | 0.4 | 2.9 | 2.88 | 4.9 | 6.9 | 1.60 | 31 | 0.1 | 60 | |||||||||||||
2006 | 0.7 | 2.2 | 2.55 | 4.1 | 6.8 | 1.50 | 28 | 0.1 | 54 | |||||||||||||
2005 | 0.6 | 3.4 | 3.47 | 5.9 | 6.5 | 1.83 | 29 | 0.1 | 73 | |||||||||||||
2004 | 1.0 | 3.1 | 3.46 | 5.8 | 11 | 2.18 | 30 | 0.1 | 73 | |||||||||||||
2003 | 0.7 | 3.3 | 4.18 | 6.1 | 12 | 2.86 | 31 | 0.1 | 88 | |||||||||||||
2002 | 1.0 | 3.7 | 4.36 | 8.2 | 10 | 2.47 | 31 | 0.1 | 92 | |||||||||||||
2001 | 0.3 | 4.0 | 4.73 | 6.6 | 24 | 4.25 | 29 | 0.1 | 99 | |||||||||||||
2000 | 0.7 | 2.9 | 3.17 | 5.0 | 5.8 | 1.37 | 31 | 0.1 | 67 | |||||||||||||
1999 | 0.3 | 4.1 | 3.55 | 5.8 | 8.1 | 2.06 | 30 | 0.1 | 75 | |||||||||||||
1998 | 0.5 | 3.7 | * | 6.9 | 10 | 2.45 | 17 | 0.1 | * | |||||||||||||
1997 | 1.7 | * | * | * | 1.7 | 2.25 | 1 | 0.1 | * | |||||||||||||
1996 | 1.5 | 4.2 | 4.15 | 7.9 | 9.0 | 2.25 | 29 | 0.1 | 87 | |||||||||||||
1995 | 0.4 | 2.5 | 2.65 | 4.7 | 8.8 | 1.75 | 32 | 0.1 | 56 | |||||||||||||
1994 | 0.2 | 2.4 | 2.50 | 3.5 | 4.8 | 1.00 | 30 | 0.1 | 52 | |||||||||||||
1993 | 0.05 | 2.3 | 2.73 | 5.0 | 6.6 | 1.70 | 30 | 0.1 | 57 | |||||||||||||
1992 | 0.1 | 1.2 | 1.53 | 2.9 | 4.6 | 1.05 | 30 | 0.1 | 32 | |||||||||||||
1991 | 0.2 | 2.0 | 2.70 | 3.8 | 20 | 3.39 | 31 | 0.1 | 57 | |||||||||||||
1990 | 0.2 | 1.4 | 1.75 | 3.9 | 5.5 | 1.39 | 31 | 0.1 | 37 | |||||||||||||
1989 | 0.4 | 2.9 | 3.05 | 6.2 | 11 | 2.39 | 49 | 0.1 | 64 | |||||||||||||
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. |