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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
34.7 450 621 1500 1580 528 30 69.4
2016
79 670 * 1500 2190 498 27 69.4
2015
34.7 420 565 1200 1540 404 30 69.4
2014
210 480 598 1100 1700 360 31 55
2013
150 400 * 900 1600 327 28 30
2012
120 280 418 750 1200 276 29 30
2011
55 280 * 590 690 204 25 30
2010
15 250 261 420 850 171 28 30
2009
95 450 493 780 1800 344 30 30
2008
170 610 763 1400 2100 512 30 1
2007
120 510 * 1100 1400 350 28 30
2006
* * * * * * 0 *
2005
* * * * * * 0 *
2004
* * * * * * 0 *
2003
240 * * * 1100 394 5 1
2002
300 640 785 1400 2300 453 30 1
2001
220 640 634 980 1300 292 28 2
2000
230 510 * 950 1700 411 11 2
1999
38 640 * 870 1900 434 17 2
1998
170 540 655 1100 1200 331 27 2
1997
110 800 762 1100 2000 410 29 2
1996
130 430 516 920 1300 293 30 2
1995
74 620 618 1000 1500 319 29 2
1994
130 640 709 960 1800 356 30 2
1993
110 560 679 1100 1700 411 27 2
1992
110 540 566 1100 1300 318 28 2
1991
93 510 547 850 1100 248 29 2
1990
200 680 * 1700 1800 491 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.