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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
144 1800 1970 3500 4670 1090 33 69.4
2016
408 2400 * 4000 5030 1340 33 69.4
2015
34.7 1800 1980 3500 7860 1470 33 69.4
2014
240 2600 * 4700 9800 2250 16 55
2013
710 1800 * 2800 4700 997 21 30
2012
420 1200 1490 2700 4000 903 32 30
2011
100 1000 1200 2400 3800 934 32 30
2010
120 680 910 2200 3200 765 29 30
2009
250 900 983 1700 2300 543 29 30
2008
750 2400 2890 5400 7800 1770 31 1
2007
200 1400 1310 2100 4500 817 32 30
2006
* * * * * * 0 *
2005
* * * * * * 0 *
2004
* * * * * * 0 *
2003
850 * * * 1300 216 5 1
2002
390 2100 2350 4100 5700 1260 36 1
2001
260 1400 1750 3300 4300 1070 39 2
2000
190 1800 1910 2900 4600 1040 40 2
1999
33 1700 2030 4100 6200 1420 39 2
1998
240 1400 1790 3600 4900 1280 42 2
1997
390 2100 2130 3500 4800 1150 34 2
1996
310 1700 1690 3700 5700 1300 36 2
1995
220 2100 2390 4600 5200 1540 30 2
1994
450 2200 * 4000 4400 1130 25 2
1993
* * * * * * 0 *
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.