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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
2024
* * * * * * 0 *
2023
* * * * * * 0 *
2022
* * * * * * 0 *
2021
* * * * * * 0 *
2020
* * * * * * 0 *
2019
* * * * * * 0 *
2018
* * * * * * 0 *
2017
* * * * * * 0 *
2016
* * * * * * 0 *
2015
* * * * * * 0 *
2014
* * * * * * 0 *
2013
310 700 * 1200 1400 329 20 30
2012
190 610 699 1400 1700 401 29 30
2011
160 600 615 1200 1400 343 29 30
2010
120 520 * 880 1200 285 23 30
2009
140 640 772 1300 2200 495 29 30
2008
250 940 1150 1900 4200 777 29 1
2007
320 810 * 1600 2600 520 26 30
2006
* * * * * * 0 *
2005
* * * * * * 0 *
2004
* * * * * * 0 *
2003
890 * * * 1600 324 4 1
2002
350 950 * 1700 2000 447 27 1
2001
290 1100 1080 1700 2400 540 28 2
2000
370 990 * 1700 4900 859 29 2
1999
330 1100 1250 2500 4800 1070 26 2
1998
180 670 884 1600 1900 468 29 2
1997
110 1200 1230 2000 2900 654 30 2
1996
550 1100 * 1900 7000 1320 23 2
1995
210 1200 1280 2000 3000 598 29 2
1994
310 1200 1270 1800 3200 601 29 2
1993
200 1200 1260 2000 3900 765 30 2
1992
200 1300 1260 2000 2500 577 30 2
1991
470 1300 1360 1900 3300 694 28 2
1990
600 1400 * 3400 4400 1090 16 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.