The photo below shows a large purple orb I photographed above a building in New York City. The orb had a size that was one tenth of the original photo height. In order for a dust particle to appear this large, it would have to have a size of about 1500 microns (1.5 millimeters), which is about 1500 times larger than the actual size of outdoor airborne dust particles (about 1 micron). The moon was not visible when the photo was taken.
There was no rain, fog, mist or precipitation on this night. The air quality listed on airnow.gov was "good," with a rating of 30.
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