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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
34.7 700 714 1300 1560 416 29 69.4
2016
146 760 * 1200 1300 356 28 69.4
2015
34.7 550 514 810 906 228 30 69.4
2014
73 720 723 1000 1500 323 30 55
2013
15 680 * 1100 1100 347 26 30
2012
82 460 474 790 900 258 28 30
2011
15 420 504 910 1400 345 30 30
2010
47 360 407 750 930 246 28 30
2009
39 400 486 960 1000 292 31 30
2008
58 970 1050 1700 2900 667 29 1
2007
150 680 * 1100 1300 316 25 30
2006
* * * * * * 0 *
2005
* * * * * * 0 *
2004
* * * * * * 0 *
2003
230 * * * 970 358 4 1
2002
250 1100 1100 1700 2900 588 29 1
2001
110 880 * 1700 2000 535 24 2
2000
82 720 * 1100 1200 333 15 2
1999
150 1100 * 1700 2200 566 27 2
1998
37 630 676 1200 1900 447 29 2
1997
86 730 803 1400 2200 470 31 2
1996
51 940 856 1600 1800 518 29 2
1995
56 760 994 2000 2500 700 31 2
1994
120 840 * 1500 2500 554 27 2
1993
41 760 919 1900 2400 647 31 2
1992
150 860 * 1600 2700 650 22 2
1991
79 1100 1100 1800 2300 561 28 2
1990
200 1400 * 2900 3500 981 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.