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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
470 * * * 1600 501 4 55
2013
200 850 * 1400 1800 430 28 30
2012
150 460 530 950 1800 407 29 30
2011
51 420 452 860 1100 287 31 30
2010
83 390 * 760 1100 249 25 30
2009
81 460 581 930 2200 441 31 30
2008
240 950 1090 2000 2700 614 28 1
2007
280 900 * 1900 3100 665 28 30
2006
* * * * * * 0 *
2005
* * * * * * 0 *
2004
* * * * * * 0 *
2003
320 * * * 1500 483 5 1
2002
510 1300 1500 2300 3100 681 29 1
2001
210 1200 1250 2100 2700 702 30 2
2000
380 1300 * 2500 3000 792 14 2
1999
180 1000 * 2200 3900 869 20 2
1998
260 1000 1100 1900 2900 661 24 2
1997
140 1000 1030 1900 2100 568 27 2
1996
80 990 1200 2400 3300 781 27 2
1995
97 1200 * 2500 3500 829 27 2
1994
180 920 * 1500 2800 599 27 2
1993
130 970 1060 1900 2800 691 29 2
1992
50 890 1050 2200 2900 765 26 2
1991
200 930 1620 1800 15000 2550 31 2
1990
270 1100 * 2000 3000 659 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.