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Strontium
nanograms per cubic meter
Year Months
Present
Minimum Median Mean 90th
Percentile
Maximum Standard
Deviation
Number of
Observations
Detection
Limit
2023
0.65 10.5 * 17.4 26.8 6.54 21 1.3
2022
3.0 15.6 21.6 27.8 262 46.1 30 1.3
2021
1.4 17.6 * 37.6 49.3 11.8 24 1.3
2020
0.65 * * * 20.9 6.39 9 1.3
2019
2.1 12 13.7 26.4 34.2 8.44 34 1.3
2018
1.6 14.5 15.4 29.1 41.3 10.1 37 1.3
2017
0.65 10.7 13.0 21.4 30.3 6.81 33 1.3
2016
2.5 16 * 28.3 35.6 8.75 33 1.3
2015
0.65 13.8 13.8 22.5 58.9 10.4 33 1.3
2014
0.6 17 * 36 75 17.7 16 1.2
2013
6.3 13 * 18 32 6.66 21 1.5
2012
2.9 11 12.2 21.8 28 6.86 32 1.5
2011
0.75 9.0 * 21.6 27 7.87 29 1.5
2010
1.7 6.5 * 18 23 5.85 26 1.5
2009
2.5 10 10.8 15.2 36 6.42 29 1.5
2008
* * * * * * 0 *
2007
1.7 12 10.4 17.1 27 5.68 30 1.5
2006
* * * * * * 0 *
2005
* * * * * * 0 *
2004
* * * * * * 0 *
2003
7.0 * * * 11 1.82 5 1.0
2002
4.0 16 18.3 29 38 8.64 36 1.0
2001
1 13 13.9 22.6 30 7.53 39 2.0
2000
2.0 15 15.0 22.2 32 7.16 40 2.0
1999
1 14 16.1 31 39 9.69 39 2.0
1998
3.0 13.5 15.7 29 48 11.3 42 2.0
1997
3.0 16.5 16.1 25.4 36 8.68 34 2.0
1996
1 12 12.9 25.5 38 9.50 36 2.0
1995
1 15.5 16.9 32.2 36 10.6 30 2.0
1994
3.0 18 * 30.2 41 9.44 25 2.0
1993
* * * * * * 0 *
1992
* * * * * * 0 *
1991
* * * * * * 0 *
1990
* * * * * * 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.