As mentioned, too many unknowns to make it worrisome…
I like this. I’m going to start using it all the time to hamper progress on ideas which I do not support.
The fact of the matter is regardless of how much information or data exists on a certain subject, someone can always claim there are x more unknowns not considered. Which is perfect if that person wanted nothing to get done, ever, and no progress/conclusions arrived.
Good news!
DUI, too many unknowns to make it worrisome - what kind of alcohol, what kind of car, driver experience, etc… DUIs totally safe - busted.
The jet/airport/140dB example is a really good one - I particularly like it because airplanes are super neat. It takes factual information, glosses over the inverse squared law, draws a parallel to the current issue, then uses it as ‘evidence’ to ‘disprove’ the subject in discussion. Grade B+ internet trolling.
Now lets propose, just for a second, your ears hear things and the sound at the ear drum is the critical characteristic to hearing loss. For the purpose of discussion, let’s assuming while riding a bike air flows over a person’s body - including the face, helmet straps, and ears. I remember in school the idea of flow separation and drag being discussed - probably some yet-to-be-disproved hypothesis by Prandtl, Karman, or some other old, dead, guy that was totally wrong. There was this other crazy idea that disturbances in flow caused changes in energy and, among heat, energy could also be converted into sound (we could also pretend energy just went away if pesky Einstein kept his mouth shut). So putting that obviously wrong puzzle together, we could be fooled into thinking that while riding a bike, the flow as it passes facial features, helmet straps, and ears causes drag and/or separates the flow and generates sound. The creation of that sound is inches (or less) from the ear drum, where SPL matters - arguably.
Although you could measure your airport’s distance in inches and 140dB is higher than 100dB with no reported hearing loss, so you’re probably still right.
Or - and hear me out here - instead of pissing about theory we could check. You know, there are lots of people who have been cyclists for various lengths of time. There’s no need to theorize, just check the hearings of people who have ridden X miles per month for 5/ 10/ 20 years. Ideally while starting at different ages. That would tell us whether cycling *actually *causes hearing loss instead of fearmongering based on questionable theories.