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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
160 1400 1630 2800 3970 870 29 69.4
2016
376 1900 2050 3400 5380 1100 28 69.4
2015
213 1200 * 2400 4070 863 28 69.4
2014
190 1900 1870 2700 2900 747 29 55
2013
280 1700 * 2700 5300 1080 29 30
2012
170 1200 1200 2100 2300 712 30 30
2011
15 790 930 1900 1900 631 31 30
2010
64 1100 * 1300 1800 438 28 30
2009
490 1200 1180 1900 2100 498 31 30
2008
260 2200 2330 3700 5600 1200 30 1
2007
380 1500 * 3000 3700 952 23 30
2006
* * * * * * 0 *
2005
* * * * * * 0 *
2004
* * * * * * 0 *
2003
310 * * * 2400 890 5 1
2002
540 2900 2940 4500 5600 1380 31 1
2001
56 2600 2520 4400 6000 1490 30 2
2000
250 2000 2310 3800 5100 1240 29 2
1999
290 2700 2350 4000 5700 1360 28 2
1998
820 2400 * 3500 3700 900 12 2
1997
500 * * * 500 1140 1 2
1996
160 2100 2000 3400 3800 1140 27 2
1995
140 2000 2340 4400 5300 1550 30 2
1994
260 2400 2540 4100 5100 1250 30 2
1993
66 2600 2590 4800 5900 1760 28 2
1992
160 2600 2430 4300 5400 1570 30 2
1991
20 2200 2760 5100 7400 1940 30 2
1990
650 2400 * 4600 7700 1740 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.