Hearing Safety Checker

This checker turns the published exposure standards into one honest report. NIOSH's recommended limit (CDC DHHS 98-126) is 85 dBA averaged over 8 hours with a 3 dB exchange rate — every +3 dB halves the allowed time (88 dBA → 4 h, 100 dBA → 15 min). OSHA's legal workplace PEL is 90 dBA over 8 hours with a slower 5 dB exchange rate, and its action level sits at half the dose. The WHO-ITU H.870 safe-listening standard works weekly: 80 dB LAeq for up to 40 hours (children: 75 dB) — the same math phones use for their weekly sound allowance. Enter your typical listening level (a sound-meter app or dosimeter makes it real), duration and weekly sessions, or upload the actual track/podcast for its measured duration and integrated loudness (BS.1770). You get the three doses side by side, the exact safe listening time at your level, and the level to turn down to for your routine to stay inside each standard. Estimates assume a steady level — informational, not medical advice.