I had a similar hum in Ma. It drove me crazy for a week and my wife couldn't hear it. It would come and go and had me thinking that I might have had some sort of ear damage. Finally at 3 AM, I followed the hum by foot(couldn't hear it in the car) and traced it to a large generator temporarily supplying power to a building that had no electricity due to a flood.A week later, the generator was gone as well as the hum.
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