Ear plugs should reduce intensity of sounds across the board. Yes, they’re less effective against low frequency noise, but reducing the intensity any amount goes a long way – the logarithmic scale is real!
I also personally find high frequency noise to be more disruptive: a car speeding by making wind noise is a lot worse than a large truck rumbling by slowly. Lower frequency is lower energy, after all
I also personally find high frequency noise to be more disruptive: a car speeding by making wind noise is a lot worse than a large truck rumbling by slowly. Lower frequency is lower energy, after all