In 2009, the head of audiology at Addenbrooke's Hospital in Cambridge, David Baguley, said he believed people's problems with the hum were based on the physical world about one-third of the time, and stemmed from people focusing too keenly on innocuous background sounds the other two-thirds of the time. There is skepticism as to whether the hum exists as a physical sound. Louis County, Missouri and surrounding areas. In 2021, hums were reported in Frankfurt and Darmstadt, in Germany. When the blast furnaces were deactivated in April 2020, the noise went away as well. Steel was the possible cause, but officials stated that no new equipment had been installed or activated around the time that the noise became noticeable. Canadian officials requested US assistance in determining the source, but local authorities were stymied by official refusals to allow access to the island. It was estimated that the sound was emanating from Zug Island, a heavily industrialized section of River Rouge on the north bank of the Detroit River (which separates Windsor and Detroit). In late 2011, residents of Windsor, Ontario (south of Detroit, Michigan), began reporting a low droning vibration, sometimes loud enough to be irritating (one evening in 2012 saw 22,000 reports to officials). His previous research using simulated sounds had indicated that the hum was around 56 hertz. In 2006, Tom Moir, then of Massey University in Auckland, New Zealand, made several recordings that appeared to be the Auckland Hum. Age does appear to be a factor, with middle-aged people more likely to hear it. There are approximately equal percentages of male and female hearers. It seems possible for hearers to move away from it, with one hearer of the Taos Hum reporting its range was 30 miles (48 km). Similar results have been found in an earlier British study. Taos Hum Ī study into the Taos Hum in the early 1990s in Taos, New Mexico indicated that at least two percent could hear it each hearer at a different frequency between 32 Hz and 80 Hz, modulated from 0.5 to 2 Hz. These noises were often confined to a 10-kilometre (6 mi) wide area. The sound, always peaking between 30 and 40 Hz, was found to only be heard during cool weather with a light breeze, and often early in the morning. Different causes have been attributed, including local mechanical sources, often from industrial plants, as well as manifestations of tinnitus or other biological auditory effects.Ī 1973 report cites a university study of fifty cases of people complaining about a "low throbbing background noise" that others were unable to hear. The Hum does not appear to be a single phenomenon. They are sometimes named according to the locality where the problem has been particularly publicized, such as the " Taos Hum" in New Mexico and the " Windsor Hum" in Ontario. Hums have been reported all over the world, including the United States, the United Kingdom, Australia and Canada.
The Hum is a name often given to widespread reports of a persistent and invasive low-frequency humming, rumbling, or droning noise audible to many but not all people. For other uses, see Hum (disambiguation).
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