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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
86 650 879 1400 3200 715 28 69.4
2016
111 440 573 1300 1970 466 30 69.4
2015
34.7 420 553 1000 1620 366 30 69.4
2014
110 500 636 970 3200 586 30 55
2013
91 500 * 1500 1800 508 28 30
2012
15 280 371 840 1300 340 30 30
2011
15 370 431 710 1300 272 29 30
2010
79 240 * 790 1500 331 28 30
2009
67 290 358 720 880 238 31 30
2008
210 550 644 1100 2100 470 31 1
2007
130 440 539 1200 1900 429 28 30
2006
* * * * * * 0 *
2005
* * * * * * 0 *
2004
* * * * * * 0 *
2003
600 * * * 1700 381 6 1
2002
200 630 899 1700 5200 942 30 1
2001
160 540 805 2000 2500 660 31 2
2000
280 860 * 1700 2100 597 19 2
1999
120 530 * 1100 1300 308 20 2
1998
210 520 610 1200 1600 349 26 2
1997
140 600 744 1500 2100 502 28 2
1996
66 530 773 1500 2600 593 26 2
1995
92 530 706 1600 2100 593 30 2
1994
92 490 705 1500 2800 594 30 2
1993
110 600 837 1600 2100 552 27 2
1992
180 470 * 970 2100 484 16 2
1991
180 520 * 1100 3500 707 25 2
1990
150 490 * 1100 1700 426 14 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.