Idea: a "neighborhood noise map" by time of day (and the flaws the AI pointed out itself)

In one line: people measure the noise around them for 30 seconds with their phone, and the service maps each neighborhood's noise by time of day.

Why it might be needed
- You usually view a home during the day, so you only learn about the night-time motorbikes and bars after you move in.
- Noise can be measured in numbers (dB), which is easier to compare than reviews.

Flaws the AI pointed out itself
- Every phone microphone has a different sensitivity, so the same spot reads differently. It needs per-device calibration.
- People still have to do the measuring, and the motivation is weak. People thinking about moving might use it briefly and leave.
- If a particular shop or house gets marked as "the noisy place", disputes follow. The map has to blur everything to at least block level.

Gem or slop? I would love to hear from anyone who has tried something like this.