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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
* * * * * * 0 *
2016
* * * * * * 0 *
2015
* * * * * * 0 *
2014
770 1200 * 2000 2600 537 12 55
2013
400 1300 * 2200 3700 727 26 30
2012
230 950 989 1700 2300 506 29 30
2011
150 1100 * 1600 2000 399 23 30
2010
150 830 890 1400 2000 453 29 30
2009
180 1100 1060 1700 2100 523 30 30
2008
290 1700 1810 2700 4400 857 30 1
2007
530 1200 * 2000 2200 511 26 30
2006
* * * * * * 0 *
2005
* * * * * * 0 *
2004
* * * * * * 0 *
2003
820 * * * 2000 458 5 1
2002
540 1700 1770 2600 3100 661 30 1
2001
220 1400 * 2300 2800 645 28 2
2000
290 1400 1470 2100 3900 732 31 2
1999
510 1500 * 2600 3700 740 25 2
1998
380 1400 1350 2000 2500 545 29 2
1997
490 1600 * 2500 3400 664 29 2
1996
210 1600 * 2200 2400 596 23 2
1995
220 1500 1550 2600 4300 907 31 2
1994
370 1700 * 2300 4200 760 27 2
1993
140 1700 1610 2400 3200 776 31 2
1992
560 1500 1970 2200 15000 2790 31 2
1991
340 1800 1860 2900 4500 944 28 2
1990
1000 2100 * 3400 4100 917 15 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.