Mines pretty bad - for about 6 years now, A swarm of cicadas that never die!!! Probably due to abuse/lack of protection at the drag races, concerts, and the occasional grinder in my shop. I've also lost 50% in the left, and 30% in the right.
I went to a hearing and balance clinic. I got fitted for hearing aids in both ears and if there is any kind of ambient noise, it lessens significantly. Dead quite and it's loud as heck.
Sound machines work a bit at night. The clinic was able to narrow it down to an equivalent frequency(s) that it sounds like to me. With that we played with different white/pink/brown etc noises until we found one that cancels it the best.
For the past three years its been heaven compared to before - It was really making me nuts.
That said - do the radio systems speed up the speech of the public safety entities? Good lord they jabber fast - how the heck to you make some of it out?