Originally Posted by
pineteam
It’s loud at low level but above FL250 it’s not that bad. Not sure how accurate is the Apple watch but I never get a noise level over 80 db on the A320 at high altitude. It’s around 76 db.
NIOSH produces a sound level meter that's tailored to the iphone if you're interested.
https://www.cdc.gov/niosh/topics/noise/app.html
I know more about airplanes than ear diseases, but even if the cockpit is at 76db, being in that environment for thousands of hours doesn't seem like a smart move.