Not sure where to post this so i’m putting it here.
A little while back, i wrote my masters thesis on city ambient noise and the effects on human health and how to mitigate noise propagation using urban design principles. In other words, i find this stuff endlessly fascinating.
It also serves as a PSA that, whatever the cause of this particular strange occurrence, it’s incredibly important to take care of your hearing. Most of us probably listen to high frequencies at high volumes and are exposed to ambient noise all the time (which is increasing). This exposure can negatively impact a lot of your body’s rhythms and systems (such as blood pressure; studies have been conducted on communities surrounding airports that correlate these 2 things). So, in other words, protect your ears! That’s all. Have a great day!