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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 | 1.8 | * | 5.0 | 7.9 | 1.93 | 18 | 0.1 | * | |||||||||||||
2022 | 1.0 | 4.0 | 4.00 | 6.5 | 8.7 | 2.15 | 30 | 0.1 | 84 | |||||||||||||
2021 | 1.0 | 3.6 | * | 11.3 | 17 | 4.42 | 16 | 0.1 | * | |||||||||||||
2020 | 1.4 | * | * | * | 4.3 | 0.96 | 10 | 0.1 | * | |||||||||||||
2019 | 0.9 | 2.5 | 3.15 | 5.4 | 6.4 | 1.61 | 34 | 0.1 | 66 | |||||||||||||
2018 | 1.0 | 3.8 | 3.97 | 7.1 | 7.9 | 2.05 | 34 | 0.1 | 83 | |||||||||||||
2017 | 0.05 | 2.9 | 3.83 | 6.8 | 8.7 | 2.24 | 33 | 0.1 | 80 | |||||||||||||
2016 | 1.4 | 4.4 | 4.15 | 6.2 | 7.6 | 1.69 | 36 | 0.1 | 87 | |||||||||||||
2015 | 1.0 | 3.3 | 3.29 | 4.6 | 5.6 | 1.18 | 32 | 0.1 | 69 | |||||||||||||
2014 | 1.3 | 3.5 | * | 5.0 | 5.9 | 1.40 | 15 | 0.1 | * | |||||||||||||
2013 | 0.05 | 3.0 | * | 4.8 | 6.4 | 1.42 | 24 | 0.1 | * | |||||||||||||
2012 | 0.05 | 2.7 | 2.95 | 5.2 | 7.1 | 1.53 | 33 | 0.1 | 62 | |||||||||||||
2011 | 0.7 | 2.1 | 2.70 | 4.8 | 6.0 | 1.59 | 32 | 0.1 | 57 | |||||||||||||
2010 | 0.5 | 2.6 | 2.77 | 4.9 | 7.2 | 1.69 | 29 | 0.1 | 58 | |||||||||||||
2009 | 0.7 | 2.2 | 2.74 | 5.2 | 6.1 | 1.56 | 31 | 0.1 | 58 | |||||||||||||
2008 | 0.8 | 2.6 | 2.58 | 4.3 | 5.5 | 1.25 | 30 | 0.1 | 54 | |||||||||||||
2007 | 0.8 | 2.5 | 2.61 | 4.3 | 4.6 | 1.15 | 33 | 0.1 | 55 | |||||||||||||
2006 | 0.6 | 2.6 | 2.77 | 4.6 | 6.6 | 1.35 | 34 | 0.1 | 58 | |||||||||||||
2005 | 0.5 | 2.6 | 2.61 | 4.6 | 5.3 | 1.37 | 34 | 0.1 | 55 | |||||||||||||
2004 | 0.8 | 2.3 | * | 3.3 | 3.6 | 0.76 | 25 | 0.1 | * | |||||||||||||
2003 | 0.9 | 3.1 | 3.43 | 5.4 | 8.5 | 1.78 | 32 | 0.1 | 72 | |||||||||||||
2002 | 0.7 | 3.4 | 3.15 | 4.3 | 5.4 | 1.10 | 36 | 0.1 | 66 | |||||||||||||
2001 | 0.6 | 2.7 | 3.44 | 5.6 | 14 | 2.35 | 35 | 0.1 | 72 | |||||||||||||
2000 | 1.0 | 2.5 | 2.79 | 5.3 | 5.9 | 1.45 | 38 | 0.1 | 58 | |||||||||||||
1999 | 0.5 | 3.9 | 3.67 | 5.3 | 6.4 | 1.40 | 31 | 0.1 | 77 | |||||||||||||
1998 | 0.5 | 3.0 | 2.99 | 5.4 | 6.2 | 1.60 | 34 | 0.1 | 63 | |||||||||||||
1997 | 1.4 | 3.2 | 3.12 | 4.2 | 4.4 | 0.85 | 30 | 0.1 | 66 | |||||||||||||
1996 | 1.3 | 3.2 | 3.48 | 5.6 | 8.0 | 1.75 | 35 | 0.1 | 73 | |||||||||||||
1995 | 0.3 | 1.6 | 1.92 | 3.8 | 5.5 | 1.48 | 31 | 0.1 | 40 | |||||||||||||
1994 | 0.3 | 1.3 | * | 2.8 | 4.6 | 0.99 | 25 | 0.1 | * | |||||||||||||
1993 | * | * | * | * | * | * | 0 | * | * | |||||||||||||
1992 | * | * | * | * | * | * | 0 | * | * | |||||||||||||
1991 | * | * | * | * | * | * | 0 | * | * | |||||||||||||
1990 | * | * | * | * | * | * | 0 | * | * | |||||||||||||
1989 | * | * | * | * | * | * | 0 | * | * | |||||||||||||
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. |