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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
34.7 490 694 1300 2980 683 29 69.4
2016
34.7 620 622 1000 1490 358 31 69.4
2015
80 740 806 1100 3090 542 28 69.4
2014
27.5 670 655 1200 1400 394 30 55
2013
210 640 * 1300 3400 619 28 30
2012
53 370 370 640 990 235 28 30
2011
49 310 383 730 1300 283 30 30
2010
15 240 * 490 550 145 17 30
2009
73 300 494 930 1900 408 31 30
2008
70 880 * 1700 2600 649 25 1
2007
180 550 510 760 1000 219 29 30
2006
* * * * * * 0 *
2005
* * * * * * 0 *
2004
* * * * * * 0 *
2003
300 * * * 810 191 5 1
2002
110 740 869 1400 2300 489 30 1
2001
95 730 819 1600 1800 536 31 2
2000
47 500 753 1500 2100 528 28 2
1999
150 760 1010 1800 5000 934 29 2
1998
95 520 740 1500 2300 627 29 2
1997
30 730 874 1600 1800 497 29 2
1996
46 560 669 1400 1800 495 31 2
1995
52 580 815 1800 3100 775 30 2
1994
47 740 766 1400 1900 483 30 2
1993
160 780 * 1500 2300 543 24 2
1992
* * * * * * 0 *
1991
* * * * * * 0 *
1990
* * * * * * 0 *
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.