Surface O3 and PM2.5
                              available ~7:45 am

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Change Type: Daily sfc max or avg Runing 24h avg
Year: 2008 2009 2010 2011 2012 2013	Month: Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec	Day: 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Select Cycle: 12Z 06Z
Select Field: 1-24 h avg (07Z-06Z UTC) 25-48h avg (07Z-06Z UTC)
Select Region: CONUS     Northeast US Southeastern US Along I95 Corridor Central US Northwestern US Texas Florida California Shenandoah Valley
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