brummandet

Brummandet is a Swedish term describing a persistent low-frequency sound or rumble perceived by a portion of the population. Commonly described as a continuous hum or vibration, brummandet is closely related to the international phenomenon known as the Hum, though it is anchored in Swedish discourse and local contexts. The sound is typically low in frequency, often below 100 Hz, and may be tonal or broadband. It is frequently experienced indoors, sometimes more clearly at night, and can be accompanied by sensations of vibration in buildings or objects, even when no obvious source is audible.

Causes of brummandet are varied and not always identifiable. Potential sources include mechanical systems such as heating, ventilation and air conditioning units, industrial equipment, electrical installations, traffic and rail noise, wind turbines, and geological factors that produce low-frequency waves or building resonances. Infrasound and low-frequency noise exposure can contribute to perceptual effects even when sound levels are low.

Perception of brummandet is subjective and may be influenced by attention, expectation, and individual sensitivity. Reported health impacts include annoyance, sleep disturbance, headaches, and fatigue, though scientific evidence linking brummandet to specific health outcomes remains inconclusive. Research in acoustics and environmental health uses targeted sound measurements, psychoacoustic testing, and community surveys to map occurrences and evaluate mitigation strategies.

Mitigation focuses on source control and structural adjustments: improving equipment mounting and isolation, acoustic enclosures, better vibration damping, and, where feasible, balancing or relocating noisy sources. Urban planning and building design can reduce indoor exposure. The term brummandet continues to appear in Swedish media and scientific discussions as communities seek explanations and remedies for persistent low-frequency rumble.