Black Zone is a mechanic in BATTLEGROUNDS.
Compared to the Red Zone, this hazard, levels buildings into smoking ruins. The Black Zone is designed to push players out of the safety of a building. The hazard is random: towns and compounds can be undamaged, totally flattened, and everything in between. The mix of buildings and ruins evolves in real time throughout the match: Meaning don’t always expect that building you run to for cover to be there late in the match. If you hear the siren, and you are inside that purple circle on the minimap; evacuate!