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nanograms per cubic meter
Year Months
Present
Minimum Median Mean 90th
Percentile
Maximum Standard
Deviation
Number of
Observations
Detection
Limit
2017
0.65 0.65 1.41 2.8 5.6 1.02 420 1.3
2016
0.65 0.65 0.69 0.65 3.0 0.21 424 1.3
2015
0.65 0.65 0.65 0.65 1.6 0.05 418 1.3
2014
0.8 0.8 1.03 1.8 4.5 0.66 398 1.6
2013
0.75 0.75 * 0.75 2.7 0.19 431 1.5
2012
0.75 0.75 0.92 0.75 4.0 0.53 444 1.5
2011
0.75 0.75 0.76 0.75 4.4 0.19 430 1.5
2010
0.75 0.75 0.76 0.75 2.0 0.09 440 1.5
2009
0.75 0.75 0.84 0.75 8.0 0.72 520 1.5
2008
* * * * * * 0 *
2007
0.75 0.75 0.88 0.75 6.7 0.75 462 1.5
2006
* * * * * * 0 *
2005
* * * * * * 0 *
2004
* * * * * * 0 *
2003
7.5 7.5 * 7.5 7.5 0.00 86 15
2002
7.5 7.5 7.77 7.5 20 0.61 491 15
2001
8 8 8.14 8 40 1.76 505 16
2000
8 8 8.12 8 26 1.16 472 16
1999
8 8 8.23 8 25 1.70 565 16
1998
8 8 8.02 8 18 0.42 561 16
1997
8 8 8.03 8 23 0.74 557 16
1996
8 8 8.00 8 8 0.00 595 16
1995
8 8 8.13 8 38 1.56 602 16
1994
8 8 8.15 8 33 1.46 585 16
1993
8 8 8.00 8 8 0.00 575 16
1992
8 8 8.01 8 17 0.38 554 16
1991
8 8 8.02 8 19 0.46 567 16
1990
8 8 * 8 17 0.51 309 16
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.