An "Arch" of Mysterious Sky Orbs

Photo date: July 1, 2015. Photographer: Mark Mahin.

This photo was taken pointing up at the Empire State Building in New York. We see a bunch of orbs that seem to be forming a kind of arch shape. Almost all of these orbs appear in the sky (rather in front of the buildings), which is a very strong indication that we are not merely seeing particles near the camera (which would be scattered randomly around the picture area).

There was no fog, mist, rain or precipitation on this night.  The air quality was moderate, with a level of 60, almost good enough to qualify as "good."  The pollen count listed on www.pollen.com was good, with a very low level of only 0.5.