system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do they make controlled demolitions safe? Why is does dust/ash/smoke not fill the streets like it did with 9/11?
gpt
Buildings undergoing controlled demolition are cleaned ahead of time.

Electrical wiring, wood, doors, furniture, carpets, glass etc are all removed ahead of time to prevent fires, debris, splinters etc.

Parts of the buildings are also wrapped to contain debris and dust.

You'll also often see water sprayers in the area, the increased humidity helps prevent dust from forming and spreading.