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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
1.43 4.3 * 8.1 17.8 3.93 19 2.86
2022
1.43 6.6 9.46 11.9 102 17.5 31 2.86
2021
1.43 9.0 * 14.6 17.3 3.94 22 2.86
2020
3.8 * * * 18 5.77 8 2.86
2019
1.43 8.5 10.9 19.9 26.2 5.95 29 2.86
2018
1.43 12.4 * 21.1 28.9 6.80 29 2.86
2017
3.4 11.7 20.7 33.6 119 22.3 29 2.86
2016
3.2 13.5 * 25.8 35.1 8.07 28 2.86
2015
3.4 10.9 12.2 20.2 39.4 7.44 30 2.86
2014
3.05 11 11.5 21.2 27 7.57 30 6.1
2013
0.75 12 * 26 34 8.63 26 1.5
2012
5.3 13 * 16.6 23 4.27 18 1.5
2011
1.6 12 * 20.8 36 8.22 17 1.5
2010
2.2 12 * 24 28 7.18 21 1.5
2009
1.9 12.5 * 18 24 5.13 26 1.5
2008
* * * * * * 0 *
2007
3.7 14 * 25.8 37 8.61 24 1.5
2006
* * * * * * 0 *
2005
* * * * * * 0 *
2004
* * * * * * 0 *
2003
8.0 * * * 19 4.99 4 1.0
2002
4.0 12 15.0 22.6 65 11.7 29 1.0
2001
5.0 15 * 33.2 210 40.5 24 2.0
2000
5.0 12 * 16.2 22 3.83 15 2.0
1999
3.0 13 * 34 40 10.2 27 2.0
1998
3.0 13 21.2 34 90 19.1 29 2.0
1997
7.0 26 29.7 65 110 24.5 31 2.0
1996
6.0 23 25.8 43.4 80 16.6 29 2.0
1995
5.0 21 30.8 46 240 41.2 31 2.0
1994
4.0 14 * 24 31 7.63 27 2.0
1993
10 31 40.8 56 120 22.7 31 2.0
1992
4.0 34.5 * 59 61 16.3 22 2.0
1991
6.0 32 52.2 98.1 340 81.5 28 2.0
1990
5.0 13 * 23.5 36 8.44 16 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.