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Formaldehyde
parts per billion
Read About Estimated Risk
Year Months
Present
Minimum Median Mean 90th
Percentile
Maximum Standard
Deviation
Number of
Observations
Detection
Limit
Estimated
Risk
2023
* * * * * * 0 * *
2022
1.2 3.3 * 5.8 9.1 1.83 23 0.1 *
2021
0.8 4.1 * 6.1 8.7 1.91 16 0.1 *
2020
1.1 * * * 3.3 1.01 5 0.1 *
2019
0.6 2.9 3.25 6.2 7.0 1.80 31 0.1 68
2018
1.0 4.0 4.03 6.8 9.8 2.21 30 0.1 85
2017
1.1 3.3 3.87 7.4 9.1 2.04 30 0.1 81
2016
1.5 4.3 4.18 7.0 8.8 2.04 31 0.1 88
2015
1.1 3.5 3.62 5.8 7.5 1.46 30 0.1 76
2014
0.9 3.6 3.58 5.6 6.0 1.62 30 0.1 75
2013
0.6 2.9 3.16 5.3 7.4 1.59 31 0.1 66
2012
0.8 3.4 3.33 5.8 7.2 1.75 30 0.1 70
2011
0.7 2.7 3.01 4.9 6.5 1.55 28 0.1 63
2010
0.1 2.7 2.64 3.8 6.4 1.42 27 0.1 55
2009
0.5 2.9 3.21 5.6 9.1 1.96 30 0.1 67
2008
0.4 2.6 3.00 5.4 6.5 1.72 30 0.1 63
2007
0.8 2.8 2.94 5.2 5.9 1.40 30 0.1 62
2006
0.7 2.0 * 3.9 5.4 1.17 21 0.1 *
2005
0.4 3.4 3.62 6.1 6.8 1.98 28 0.1 76
2004
0.7 2.7 3.04 6.1 7.2 1.98 30 0.1 64
2003
1.0 3.0 3.45 6.1 7.2 1.86 25 0.1 73
2002
1.0 3.1 * 6.7 7.5 1.92 21 0.1 *
2001
0.2 4.0 3.80 5.7 18 3.26 28 0.1 80
2000
1.1 3.1 3.05 4.8 5.5 1.28 28 0.1 64
1999
1.5 * * * 1.5 0.56 1 0.1 *
1998
* * * * * * 0 * *
1997
* * * * * * 0 * *
1996
* * * * * * 0 * *
1995
* * * * * * 0 * *
1994
* * * * * * 0 * *
1993
* * * * * * 0 * *
1992
* * * * * * 0 * *
1991
* * * * * * 0 * *
1990
* * * * * * 0 * *
1989
* * * * * * 0 * *
Graph It!
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.