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Iron
nanograms per cubic meter
Year Months
Present
Minimum Median Mean 90th
Percentile
Maximum Standard
Deviation
Number of
Observations
Detection
Limit
2017
* * * * * * 0 *
2016
* * * * * * 0 *
2015
* * * * * * 0 *
2014
* * * * * * 0 *
2013
* * * * * * 0 *
2012
* * * * * * 0 *
2011
* * * * * * 0 *
2010
* * * * * * 0 *
2009
* * * * * * 0 *
2008
* * * * * * 0 *
2007
* * * * * * 0 *
2006
* * * * * * 0 *
2005
* * * * * * 0 *
2004
* * * * * * 0 *
2003
* * * * * * 0 *
2002
710 * * * 1600 306 10 2
2001
240 910 1160 1900 3300 753 30 2
2000
180 900 1070 1600 3600 672 28 2
1999
420 870 1040 1500 3500 599 30 2
1998
280 700 915 1800 2900 652 29 2
1997
160 780 912 1500 1800 467 30 2
1996
130 870 806 1400 1500 412 28 2
1995
83 850 988 1900 3000 786 30 2
1994
130 940 991 1600 2800 578 31 2
1993
220 1100 1140 2000 3300 661 29 2
1992
260 1100 1150 1800 3600 642 30 2
1991
260 970 1260 2400 3800 826 28 2
1990
500 1300 * 1600 3300 612 15 2
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.