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Tinnitus (ringing, buzzing or hissing in the ears) that occurs for only a short time after exposure to high noise levels is an early warning sign that your hearing is at risk and you may have suffered some permanent loss of hearing acuity.
Always treat it seriously when you hear a carbon monoxide detector beeping. The beeping or chirping sound is usually quite noticable but nowehere near as loud as when an actual alarm is activated. Detectors may beep for different reasons but it is always a sign that the detector needs attention.