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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
48 220 * 390 420 111 17 30
2009
46 240 316 550 840 209 31 30
2008
120 380 534 1000 1800 385 30 1
2007
130 400 540 960 1900 424 28 30
2006
* * * * * * 0 *
2005
* * * * * * 0 *
2004
* * * * * * 0 *
2003
290 * * * 820 206 5 1
2002
160 720 * 1200 1400 369 24 1
2001
160 620 * 1000 1600 342 27 2
2000
150 480 695 1300 2000 503 28 2
1999
140 680 749 1300 2800 526 28 2
1998
210 510 823 1500 5000 959 25 2
1997
97 490 * 1200 2200 457 28 2
1996
110 440 569 1100 1500 403 30 2
1995
76 550 658 1400 2200 524 30 2
1994
100 550 625 1300 1500 372 29 2
1993
130 500 720 1400 2300 567 29 2
1992
82 510 544 950 1200 284 31 2
1991
130 580 764 1400 2800 599 29 2
1990
340 800 * 1600 2200 539 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.