How dark is the sky in Kuyavia-Pomerania?

Sky darkness for 12 towns and parks in Kuyavia-Pomerania, worked out from NASA satellite images of light at night (2025). 7 of them have skies of Bortle 4 or darker, where the Milky Way shows overhead. The darkest is Brodnica Landscape Park (21.40, Bortle 4), the brightest Bydgoszcz (18.68, Bortle 7). The bright core of the Milky Way never climbs clear of the horizon haze anywhere in Kuyavia-Pomerania while the sky is fully dark; the rest of the band passes overhead, with the longest moonless nights from September to March.