Date,Lead Non-FRM/FEM (Nanograms/cubic meter),Manganese (Nanograms/cubic meter),Lead Sample Screening Level,Manganese  Sample Screening Level
8/17/2009,6.13,380,150,500
8/23/2009,2.09,2.71,150,500
8/29/2009,1.1,21.2,150,500
9/4/2009,6.27,15.9,150,500
9/10/2009,3.37,--,150,--
9/16/2009,2.06,12,150,500
9/22/2009,2.08,148,150,500
9/28/2009,0.966,16,150,500
10/4/2009,--,3.02,--,500
10/10/2009,0.762,2.69,150,500
10/16/2009,2.38,2.42,150,500
10/22/2009,12.8,1170,150,500
10/28/2009,1.08,90.7,150,500
11/3/2009,5.68,39.4,150,500
12/23/2011,,2.41,,500
12/24/2011,,73.4,,500
12/25/2011,,85.7,,500
12/26/2011,,--,,--
12/27/2011,,80.1,,500
12/28/2011,,5.02,,500
12/29/2011,,22.9,,500
12/30/2011,,21.9,,500
12/31/2011,,12.6,,500
1/1/2012,,12.6,,500
1/2/2012,,--,,--
1/3/2012,,15.2,,500
1/4/2012,,--,,--
1/5/2012,,--,,--
1/6/2012,,--,,--
1/7/2012,,56.3,,500
1/8/2012,,11.5,,500
1/9/2012,,405,,500
1/10/2012,,189,,500
1/11/2012,,--,,--
1/12/2012,,192,,500
1/13/2012,,18.2,,500
1/14/2012,,--,,--
1/15/2012,,--,,--
1/16/2012,,--,,--
1/17/2012,,--,,--
1/18/2012,,4.08,,500
1/19/2012,,96.8,,500
1/20/2012,,4.86,,500
1/21/2012,,2.3,,500
1/22/2012,,1.69,,500
1/23/2012,,11.6,,500
1/24/2012,,145,,500
1/25/2012,,12.4,,500
1/26/2012,,7.82,,500
1/27/2012,,18.3,,500
1/28/2012,,35.6,,500
1/29/2012,,254,,500
1/30/2012,,33.1,,500
1/31/2012,,167,,500
2/1/2012,,379,,500
2/2/2012,,11.6,,500
2/3/2012,,9.56,,500
2/4/2012,,5.64,,500
2/5/2012,,3.16,,500
2/6/2012,,288,,500
2/7/2012,,953,,500
2/8/2012,,5.12,,500
2/9/2012,,15.8,,500
2/10/2012,,156,,500
2/11/2012,,31.4,,500
2/12/2012,,6.41,,500
2/13/2012,,337,,500
2/14/2012,,66.1,,500
2/15/2012,,11.3,,500
2/16/2012,,59.4,,500
2/17/2012,,9.65,,500
2/18/2012,,223,,500
2/19/2012,,3.39,,500
2/20/2012,,9.73,,500
2/21/2012,,120,,500
2/22/2012,,222,,500
2/23/2012,,163,,500
2/24/2012,,73.5,,500
2/25/2012,,3.03,,500
–– = Sample not taken or invalid,,,,
Source? https://archive.epa.gov/schoolair/web/html/warrenelemresults.html,,,,