Noise data tools for AI agents — free, no auth, no config. - **get_city_noise** — estimated noise levels for 50 major world cities (ranked, WHO-anchored) - **get_us_city_noise_exposure** — measured noise exposure for the 100 largest US cities (federal BTS data) - **list_loudest_cities** — the global ranking - **lookup_sound_level** — decibel levels of everyday sounds (CDC/NIOSH-sourced) - **safe_exposure_time** — NIOSH safe-exposure math for any dB level - **get_decibel_shield_app** — about the Decibel Shield iOS sound meter Data is CC BY 4.0 — please cite decibelshield.app. Docs: https://decibelshield.app/mcp/
First seen 2 Oct 2026. One server, whatever directories list it: each directory listing keeps its own page and history.
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| Directory | Listing | Tier | First seen |
|---|---|---|---|
| Smithery | Decibel Shield — Noise & Decibel Data | - | 2 Oct 2026 |