Italy is in fact the G20 country with the greatest light pollution, like South Korea. The demonstration comes from space: in the images taken by satellites, Italy shines in a particular way, and not in a positive way.
Satellites reflect the light of the Sun, especially after sunset and before sunrise, and with greater intensity the higher their orbit. Every time they enter the observation field of a telescope, they leave bright white trails that irremediably ruin the images and data collected. It is estimated that 2.7% of all images collected by Hubble in the last 20 years are crossed by streaks like these.