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Copper
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
12 * * * 31 8.76 4 6.1
2013
6.7 15.5 * 34.9 49 11.3 28 1.5
2012
5.0 14 * 24.8 33 7.54 23 1.5
2011
2.5 13 * 25.8 34 7.83 23 1.5
2010
8.5 19 * 31 36 8.18 21 1.5
2009
4.1 14 * 29.8 82 14.8 29 1.5
2008
* * * * * * 0 *
2007
9.1 20.5 35.2 71.5 110 26.8 30 1.5
2006
* * * * * * 0 *
2005
* * * * * * 0 *
2004
* * * * * * 0 *
2003
15 * * * 48 12.7 5 1.0
2002
5.0 20 30.1 63.4 98 23.4 29 1.0
2001
3.0 20.5 31.1 65.3 110 26.7 30 2.0
2000
8.0 33 * 70.9 120 29.4 14 2.0
1999
4.0 19.5 * 51.6 67 18.5 20 2.0
1998
4.0 18.5 22.6 43 61 14.5 24 2.0
1997
8.0 37 51.4 81.4 230 48.3 27 2.0
1996
13 36 42.5 57.4 170 29.7 27 2.0
1995
3.0 24 * 49 75 17.4 27 2.0
1994
6.0 40 * 58.6 75 15.1 27 2.0
1993
27 45 48.9 74.2 90 18.1 29 2.0
1992
7.0 43.5 45.3 69 110 22.5 26 2.0
1991
12 48 58.3 110 140 30.8 31 2.0
1990
14 38 * 67 240 53.8 15 2.0
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.