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The AQI averaged 203 on Thursday — highest on record — in Franconia, Va., the primary monitoring location for the D.C. area. Such readings are more common in major cities in the developing world.McMillan Reservoir , with an AQI of 184, surpassing Wednesday’s 162Shenandoah National Park, with an AQI of 151
Note that some locations set records over two straight days. Also note that these numbers are 24-hour averages and that peak levels were much higher. Air quality generally improved toward the mountains, but monitoring stations as far west as Hagerstown, Md., registered their second-highest AQIs during this event, reaching Code Red levels.
Other than on the Fourth of July — when there is significant particle pollution from fireworks — Code Red conditions have been very rare in recent years. The last instance of particle pollution Code Red conditions in Washington outside July 4 occurred in February 2011.The 24-hour averages summarized above only tell part of the story. For a time on Thursday morning, most of the D.C. area posted Code Purple or even Maroon AQI levels.
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