https://thescience.dev/the-moons-whisper-thin-atmosphere-a-tale-written-in-meteorite-dust/

While the moon lacks any breathable air, it does host a barely-there atmosphere. New research reveals that this delicate atmosphere is primarily a product of impact vaporization, a process where meteorites and micrometeoroids continuously bombard the lunar surface, vaporizing atoms and lofting them into the air.