AnomalyLow in pitch, continuous, almost like a car engine in the distance but neither getting louder or quieter I think asking about a family history of hearing issues is a good question to ask with the other one about hearing issues as not everyone gets this stuff tested, also should ask if people are frequent concert and club goers as that could suggest an underlying hearing issue.
Wolverhampton, UK · 2021-07-11 · from the WORLDHUMMAP archive
An account in Wolverhampton, UK
What they reported
First noticed: 2012
Pitch: Around the 240 mark
Loudest: During the night
Where: Equal indoors and outdoors
Symptoms: Insomnia, Anxiety
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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.