People have been reporting a mysterious Hum for decades. Looking back through the History of the Hum eliminates some of the causes that have been suggested for example %G and Smart Meters
 

Content 

2002 The Vancouver Hum

EMR Health Alliance of BC - Electromagnetic Radiation in Western Canada
Mysterious ‘Hum’ Harasses Vancouver Residents - By Mark Stevenson - CTV Environment Reporter - 10-6-2002
https://emrabc.ca/?p=3950