Decibel Shield — Noise & Decibel Data
@Decibel Shield (APPSTACK LLC)
Noise data tools for AI agents — free, no auth, no config. Estimated noise levels for 50 world cities (ranked,
WHO-anchored), measured noise-exposure rankings for the 100 largest US cities (federal BTS data), decibel levels of
common sounds (CDC/NIOSH-sourced), NIOSH safe-exposure-time math, and info on the Decibel Shield iOS sound meter.
Typed structured output on every tool. Data CC BY 4.0 — please cite decibelshield.app. Endpoint:
https://decibelshield.app/api/mcp (Streamable HTTP). Docs: https://decibelshield.app/mcp/