Would the airzound bike horn cause hearing damage even if used well under the duration limit?
The Airzound is 115 dB which means according to the NIOSH standard, the duration limit is 28 seconds using a 3 dB exchange rate! https://mecart.com/blog/2016/06/03/stop-noise-from-harming-your-employees-health-and-productivity/
A safety conscious college instructor taught his class that when loud sounds caused ringing, you've already permanently damaged your hearing.
Customers on Amazon mentined that the Airzound caused ringing in their ears. I experienced ringing in my ears when exposed for less than a second! That means according to the instructor, I've lost some hair cells. Is that really true?
An example here is a cyclist using it for 10 seconds in total in a day in the worst case during a round trip commute. It's possible to have a few right hooks, close passes, etc in one day. If 10 seconds in a day is enough to destroy hair cells and it's repeated once a week, it may become noticeable years later. Light duty hearing protection may be enough to prevent hearing loss. It needs to be light enough for hearing the traffic.