Smyrna, TN: how dark is the sky here?

Satellite radiance puts Smyrna 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. That's brighter than 32% 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.

How far Smyrna is from a meaningfully darker sky

The closest place in this dataset with a meaningfully darker sky is Hartsville/Trousdale County, TN, roughly 36 miles away in a straight line, rated rural. Road distance will be more.

Hartsville/Trousdale County, TN is itself still a measured city, not a designated dark-sky park, this only compares against the 3,206 places this dataset covers.

How Smyrna compares nationally

Smyrna, TN has a population of about 60,302, one of 3,206 US cities of 10,000 or more residents in this dataset. Smyrna places 1,021 of 3,206 cities in this dataset's darkest-to-brightest order.