I hear a constant 'hum' in the background. This began when I moved into a new house almost four years ago. Initially I thought it was a generator used by the construction crew but now I know it wasn't. I have now researched it a little and see it is not uncommon and has actually been named 'the hum'. Have reported it several times to environmental health - noise pollution but to no avail. Their equipment cannot pick up such low frequency sounds. Does anyone have any idea how to cope?