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Read About Estimated Risk |
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Year | Months Present |
Minimum | Median | Mean | 90th Percentile |
Maximum | Standard Deviation |
Number of Observations |
Detection Limit |
Estimated Risk |
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2024 |
|
0.4 | 0.8 | * | 1.3 | 1.5 | 0.39 | 12 | 0.1 | * | ||||||||||||
2023 |
|
0.2 | 1.2 | 1.20 | 2.3 | 3.5 | 0.78 | 31 | 0.1 | 18 | ||||||||||||
2022 |
|
0.4 | 1.4 | 1.43 | 2.4 | 3.1 | 0.76 | 30 | 0.1 | 21 | ||||||||||||
2021 |
|
0.5 | 1.4 | * | 3.1 | 3.2 | 0.85 | 16 | 0.1 | * | ||||||||||||
2020 |
|
0.3 | * | * | * | 1.8 | 0.44 | 10 | 0.1 | * | ||||||||||||
2019 |
|
0.3 | 0.9 | 1.17 | 2.3 | 3.2 | 0.78 | 34 | 0.1 | 17 | ||||||||||||
2018 |
|
0.4 | 1.2 | 1.38 | 2.3 | 3.8 | 0.75 | 34 | 0.1 | 20 | ||||||||||||
2017 |
|
0.05 | 1.2 | 1.40 | 2.4 | 3.5 | 0.79 | 33 | 0.1 | 21 | ||||||||||||
2016 |
|
0.5 | 1.8 | 1.90 | 3.1 | 3.5 | 0.84 | 36 | 0.1 | 28 | ||||||||||||
2015 |
|
0.5 | 1.4 | 1.60 | 2.6 | 3.0 | 0.71 | 32 | 0.1 | 23 | ||||||||||||
2014 |
|
0.7 | 1.6 | * | 2.2 | 3.1 | 0.67 | 15 | 0.1 | * | ||||||||||||
2013 |
|
0.05 | 1.1 | * | 1.9 | 3.2 | 0.67 | 24 | 0.1 | * | ||||||||||||
2012 |
|
0.05 | 1.3 | 1.46 | 2.5 | 3.6 | 0.81 | 33 | 0.1 | 21 | ||||||||||||
2011 |
|
0.2 | 1.2 | 1.28 | 2.7 | 3.8 | 0.90 | 32 | 0.1 | 19 | ||||||||||||
2010 |
|
0.2 | 1.1 | 1.33 | 3.0 | 3.8 | 0.97 | 29 | 0.1 | 19 | ||||||||||||
2009 |
|
0.1 | 1.0 | 1.37 | 2.9 | 3.5 | 0.92 | 31 | 0.1 | 20 | ||||||||||||
2008 |
|
0.3 | 1.1 | 1.24 | 2.1 | 2.5 | 0.62 | 30 | 0.1 | 18 | ||||||||||||
2007 |
|
0.3 | 1.0 | 1.24 | 2.5 | 3.0 | 0.80 | 33 | 0.1 | 18 | ||||||||||||
2006 |
|
0.3 | 1.3 | 1.43 | 2.5 | 3.0 | 0.74 | 34 | 0.1 | 21 | ||||||||||||
2005 |
|
0.1 | 1.5 | 1.65 | 2.7 | 4.4 | 1.00 | 34 | 0.1 | 24 | ||||||||||||
2004 |
|
0.3 | 1.3 | * | 1.8 | 2.5 | 0.58 | 25 | 0.1 | * | ||||||||||||
2003 |
|
0.1 | 1.3 | 1.51 | 2.7 | 3.4 | 0.84 | 32 | 0.1 | 22 | ||||||||||||
2002 |
|
0.05 | 1.5 | 1.37 | 2.4 | 2.9 | 0.74 | 36 | 0.1 | 20 | ||||||||||||
2001 |
|
0.2 | 1.0 | 1.27 | 2.1 | 4.5 | 0.82 | 35 | 0.1 | 19 | ||||||||||||
2000 |
|
0.2 | 1.0 | 1.19 | 2.4 | 3.2 | 0.79 | 38 | 0.1 | 17 | ||||||||||||
1999 |
|
0.3 | 1.6 | 1.69 | 3.0 | 3.4 | 0.83 | 31 | 0.1 | 25 | ||||||||||||
1998 |
|
0.2 | 1.2 | 1.27 | 2.3 | 3.6 | 0.80 | 34 | 0.1 | 19 | ||||||||||||
1997 |
|
0.4 | 1.1 | 1.22 | 2.0 | 2.3 | 0.51 | 30 | 0.1 | 18 | ||||||||||||
1996 |
|
0.5 | 1.3 | 1.59 | 2.8 | 4.3 | 0.91 | 35 | 0.1 | 23 | ||||||||||||
1995 |
|
0.05 | 0.4 | 0.49 | 1.0 | 2.6 | 0.52 | 31 | 0.1 | 7 | ||||||||||||
1994 |
|
0.1 | 0.9 | * | 2.0 | 2.3 | 0.66 | 25 | 0.1 | * | ||||||||||||
1993 |
|
* | * | * | * | * | * | 0 | * | * | ||||||||||||
1992 |
|
* | * | * | * | * | * | 0 | * | * | ||||||||||||
1991 |
|
* | * | * | * | * | * | 0 | * | * | ||||||||||||
1990 |
|
* | * | * | * | * | * | 0 | * | * | ||||||||||||
1989 |
|
* | * | * | * | * | * | 0 | * | * | ||||||||||||
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1989-1995 data and 1996-2024 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. | |||
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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. |
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