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Infrasound refers to sound waves with frequencies below the lower limit of human audibility, generally considered to be 20 Hertz (Hz). While humans cannot consciously hear infrasound, it can be perceived as vibrations or pressure changes. Sources of infrasound are varied and include natural phenomena such as earthquakes, volcanic eruptions, avalanches, and strong winds. Man-made sources include large industrial machinery, wind turbines, internal combustion engines, and even some types of aircraft.

The intensity of infrasound is often measured in decibels (dB) on a linear scale, as opposed to the A-weighted scale commonly used for audible sound. Measuring infrasound levels requires specialized equipment capable of detecting these low frequencies. While generally not causing direct hearing damage, prolonged exposure to high levels of infrasound has been a subject of research and debate, with some studies suggesting potential physiological and psychological effects, such as fatigue, dizziness, and unease. However, conclusive evidence linking infrasound to widespread adverse health effects in typical environmental exposures remains limited. Its study is important for understanding natural phenomena and potential impacts of industrial noise.