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[The loudness and hazard of noise; phenomenology, measurement, and evaluation].

The loudness and hazard of noise as a determinant of sound undesirability are considered. Physiological and hygienic acoustics are compared in the context of biomechanics and psychoacoustics. Evaluation of pulse noises and a problem of the diurnal action of noise on working and non-working populations are considered. Despite an abundance of acoustic indices, no uniform theory exists pertaining to the population's complaints. The European Union noise regulations, unsolved problems, their solution, and prospects are outlined.