Pomona, CA Night Sky Brightness
Pomona, CA: how dark is the sky here?
Pomona reads as urban on this dataset's scale. Sky glow overhead most nights. Typically only planets, the Moon, and a handful of the brightest stars are visible. That's brighter than 85.3% of the 3,206 US cities in this dataset.
This comes from a satellite measuring light radiating upward, not a person's eyes on the ground, so it isn't the same as a Bortle class, though the two track each other closely - see the Bortle scale guide for where they can disagree.
How far Pomona is from a meaningfully darker sky
The closest place in this dataset with a meaningfully darker sky is Montclair, CA, roughly 4 miles away in a straight line, rated suburban. Road distance will be more.
Montclair, CA is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.
How Pomona compares nationally
Pomona, CA counts roughly 147,966 residents, among the 3,206 US cities this site tracks. Pomona places 2,721 of 3,206 cities in this dataset's darkest-to-brightest order, ranked by the method in the methodology guide.