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Lead
nanograms per cubic meter
Read About Estimated Risk
Year Months
Present
Minimum Median Mean 90th
Percentile
Maximum Standard
Deviation
Number of
Observations
Detection
Limit
Estimated
Risk
2023
* * * * * * 0 * *
2022
* * * * * * 0 * *
2021
* * * * * * 0 * *
2020
* * * * * * 0 * *
2019
* * * * * * 0 * *
2018
* * * * * * 0 * *
2017
* * * * * * 0 * *
2016
* * * * * * 0 * *
2015
* * * * * * 0 * *
2014
* * * * * * 0 * *
2013
0.5 2.0 * 4.8 9.1 2.41 20 1.0 *
2012
0.75 3.9 * 7.5 10 2.17 26 1.5 *
2011
1.7 4.9 * 9.9 13 3.01 22 1.5 *
2010
0.75 3.8 * 13.3 190 43.9 18 1.5 *
2009
0.75 6.6 7.65 12.2 16 3.68 29 1.5 0.3
2008
* * * * * * 0 * *
2007
2.6 8.8 * 20.4 26 6.56 19 1.5 *
2006
* * * * * * 0 * *
2005
* * * * * * 0 * *
2004
* * * * * * 0 * *
2003
7.0 * * * 12 2.16 4 3.0 *
2002
1.5 9.0 * 15.8 18 4.31 27 3.0 *
2001
2 10 11.2 22.6 34 7.84 28 4.0 0.4
2000
2 9.0 * 24 180 32.5 29 4.0 *
1999
2 10 12.5 27 45 11.0 26 4.0 0.4
1998
2 11 12.3 18.2 46 8.22 29 4.0 0.4
1997
2 16 17.3 33.1 43 11.7 30 4.0 0.6
1996
5.0 13 * 30.4 290 57.8 23 4.0 *
1995
4.0 15 19.4 33.6 61 12.5 29 4.0 0.7
1994
5.0 20 24.8 42.6 71 15.0 29 4.0 0.8
1993
6.0 25 29.1 53 78 18.8 30 4.0 1
1992
5.0 23.5 29.1 53.2 67 16.2 30 4.0 1
1991
12 42.5 53.7 100 140 33.4 28 4.0 2
1990
13 41 63.5 140 171 43.8 31 1.0 2
1989
12 39 60.1 110 163 41.2 54 1.0 2
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.