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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
237 1100 1280 2300 3250 724 30 69.4
2016
210 980 1080 2000 3000 655 31 69.4
2015
200 770 1060 1800 3710 726 30 69.4
2014
500 960 1130 1600 2600 511 29 55
2013
410 1100 * 2100 4100 757 25 30
2012
170 860 * 1700 2300 548 23 30
2011
310 1100 * 1600 2800 574 14 30
2010
230 810 * 1300 1900 389 16 30
2009
170 930 1070 1900 2700 632 30 30
2008
350 1700 1730 2800 4600 927 28 1
2007
270 940 * 1500 3200 543 27 30
2006
* * * * * * 0 *
2005
* * * * * * 0 *
2004
* * * * * * 0 *
2003
650 * * * 2200 579 5 1
2002
870 1800 1970 3000 3700 731 29 1
2001
180 1500 * 2100 2900 645 22 2
2000
170 1200 1210 1800 2300 572 31 2
1999
320 1500 1610 2700 3700 829 30 2
1998
14 1300 * 2000 2400 614 26 2
1997
230 1500 * 2100 4700 982 17 2
1996
170 1600 1440 2400 4800 953 29 2
1995
210 1500 1480 2500 3300 819 28 2
1994
200 1700 1830 2800 4300 966 28 2
1993
290 1600 * 2700 3200 820 23 2
1992
20 1700 * 2900 3400 856 21 2
1991
350 1700 1710 2900 3200 818 28 2
1990
440 2200 * 4100 6000 1440 17 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.