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"The Park Service, in a separate document, similarly said that people should ‘wear an n95 mask when outdoors’ and ‘remain indoors as much as possible during and after the show.’” The guidance is to remain indoors ... during the fireworks. www.washingtonpost.com/climate-envi...

Fireworks on Mall likely to cause hazardous air pollution, documents showInternal modeling shows the July 4th fireworks display will cause hazardous pollution around the Mall and “very unhealthy conditions across central D.C.”www.washingtonpost.com