Since I worked in noise control for most of a career, I'll make a three notes here:
1) OSHA says 90dB, Europe says 85dB, is the limit for 8 hours per day. This exposure is deemed adequate to let you understand speech (instructions) until you are 65, at which age you are presumed economically useless and your ability to follow instructions pointless. Since I like music, and am already past 65, I find this criterion doubly offensive!
2) If you ears are ringing, then you have done permanent damage to your ears. We are born with excess hair cells and losing a few has no apparent affect, until a critical mass is gone. After that, every loss is a reduction in hearing with no hope of recovery. The fewer you lose when young, the longer you will be able to hear.
3) A new record was set at a football game this week - 137dB. That's about 100,000 times the energy level mentioned in note 1) above. I am told that Richter scale 1.2 or thereabouts was recorded on seismographs on that occasion. The Seahawks won; probably 100,000 fans lost a bunch of hair cells.