AnomalyLow level like idling engine. PULSATES I think my case may be somewhat unique because I have heard it in multiple countries and in different kinds of locations (urban, rural, suburban). Also I have heard it for over 20 years and it has changed. Gotten worse in Ireland and better in the US.
Have heard it in Ireland, Canada and the US · 2019-03-13 · from the WORLDHUMMAP archive
An account in Have heard it in Ireland, Canada and the US
What they reported
First noticed: 1998
Loudest: During the night
Where: Indoors
Symptoms: Insomnia, Sense of vibration, Anxiety
Changes with weather: No.
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This is a Hum report from Dr Glen MacPherson's World Hum Map, an open, worldwide record of people who hear an unexplained low-frequency hum. Reproduced with permission and with thanks; the project is at thehum.info. We remove anything on request. Location shown is approximate.