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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
* * * * * * 0 *
2001
* * * * * * 0 *
2000
* * * * * * 0 *
1999
* * * * * * 0 *
1998
* * * * * * 0 *
1997
630 1400 * 2400 2800 648 26 2
1996
140 1700 1440 2500 2900 810 27 2
1995
160 1400 1350 2500 2800 795 30 2
1994
340 1600 1490 2200 2800 619 28 2
1993
100 1300 1360 2400 3300 787 28 2
1992
200 1400 1380 2300 2700 714 30 2
1991
140 1700 * 2600 5600 1100 28 2
1990
1000 1900 * 2400 2700 483 16 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.