Your lawn mower must be a lot less loud than the one I used as a kid. Do your ears not ring after using a lawn mower, even just for one hour? Exposing yourself to a noise loud enough to make your ears ring, every day, for 8 hours... that's just asking for accelerated hearing loss.

Also, that list is kind of goofy. A snowmobile is louder than a lawn mower? A chainsaw is louder than a lawn mower? And 15 minutes per day of a loud rock concert is "safe"? You've got to be kidding me.