Engineering Acoustics/Outdoor Sound Propagation - Wikibooks, open books for an open world
The first maths part is a bit of a mind screw but lower down its not to bad. Decibels was always a bit of a bitch when I did it at Uni.
The interesting figure is figure 2
At 62hz the Atmospheric attenuation coefficient dB/km at 10 deg C 50% humidity is 0.16 and at 250 hz its 1.05 and 500hz its 2.28
So its no wonder people think its noisier because it will be. Also as well the 25-35hz is more in the normal voice range than 250hz which is a shrill woman level. And people are attuned to hear things in the human voice range.