How dark is the sky in Irmo, SC?

Satellite radiance puts Irmo in the suburban edge band. A noticeable glow near the horizon. Brighter stars and constellations are easy to pick out; the Milky Way is washed out. Irmo's sky is brighter than 16.7% of the 3,206 cities in this dataset.

Worth remembering: this is satellite radiance, not a ground observation. A true Bortle rating needs a human eye at night, this is the closest large-scale substitute.

How far Irmo is from a meaningfully darker sky

17 miles from Irmo, straight-line, sits Columbia, SC, the nearest city here with a darker sky than Irmo's own suburban edge band.

Columbia, SC is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.

Irmo against the rest of the dataset

Irmo, SC has a population of about 12,086, one of 3,206 US cities of 10,000 or more residents in this dataset. Among all 3,206 cities here, Irmo ranks 534 from darkest to brightest, 1 being the darkest measured.