Decibel Shield

Built by APPSTACK, this server surfaces noise data from decibelshield.app through six tools: city noise rankings for 50 major metros with estimated day/night dB ranges and WHO context, US city transportation noise exposure stats from BTS 2020, decibel levels for common sounds sourced from CDC and NIOSH, and NIOSH safe exposure time calculations using the 85 dB(A) 8-hour baseline with 3 dB exchange rate. All data is fetched live from published CSV/JSON datasets licensed CC BY 4.0. No authentication required. Reach for it when building assistants that need to answer hearing safety questions, compare urban noise pollution, or calculate permissible exposure durations for occupational or recreational sound levels.