Bus Guardian Angel?

Photo date: July 17, 2015. Photographer: Mark Mahin.

Some people think that guardian angels float around to protect us. Such an idea is perhaps suggested by this photo showing a mysterious pinkish-white orb floating above a bus (on a night on which the moon was only the thinnest crescent). Was this orb there to protect the passengers?

There was no fog, mist, rain, or precipitation on this night with very clean air. The air quality listed on airnow.gov was "good," with a rating of 22.