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Annual Toxics Summary
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Cobalt
nanograms per cubic meter
Year Months
Present
Minimum Median Mean 90th
Percentile
Maximum Standard
Deviation
Number of
Observations
Detection
Limit
2023
* * * * * * 0 *
2022
* * * * * * 0 *
2021
* * * * * * 0 *
2020
* * * * * * 0 *
2019
* * * * * * 0 *
2018
* * * * * * 0 *
2017
* * * * * * 0 *
2016
* * * * * * 0 *
2015
* * * * * * 0 *
2014
0.8 0.8 * 1.6 2.4 0.51 12 1.6
2013
0.75 0.75 * 0.75 2.0 0.23 26 1.5
2012
0.75 0.75 0.97 0.75 3.4 0.68 29 1.5
2011
0.75 0.75 * 0.75 0.75 0.00 20 1.5
2010
0.75 0.75 0.79 0.75 1.8 0.19 29 1.5
2009
0.75 0.75 0.75 0.75 0.75 0.00 30 1.5
2008
* * * * * * 0 *
2007
0.75 0.75 0.75 0.75 0.75 0.00 26 1.5
2006
* * * * * * 0 *
2005
* * * * * * 0 *
2004
* * * * * * 0 *
2003
7.5 * * * 7.5 0.00 5 15
2002
7.5 7.5 7.75 7.5 7.5 0.25 30 15
2001
8 8 * 8 8 0.00 28 16
2000
8 8 8.00 8 8 0.00 31 16
1999
8 8 * 8 8 0.00 25 16
1998
8 8 8.00 8 8 0.00 29 16
1997
8 8 * 8 8 0.00 29 16
1996
8 8 * 8 8 0.00 23 16
1995
8 8 8.00 8 8 0.00 31 16
1994
8 8 * 8 33 4.81 27 16
1993
8 8 8.00 8 8 0.00 31 16
1992
8 8 8.19 8 17 1.62 31 16
1991
8 8 8.00 8 8 0.00 28 16
1990
8 8 * 8 8 0.00 15 16
1989
* * * * * * 0 *
Graph It!
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.