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From my experience my hearing bounced back 1.5 month after exposure to a barrage of firecrackers while sleeping with the window open.

Hi, today I was inserting new batteries in my CO detector when it went off briefly as a test. According to the manufacturer, the sound intensity is 85 dB at 10 ft, but given I was holding it 0.5 to 1 feet from my face, I received about a 110 dB dose. The beep was very high pitched and lasted for...