Abstract
Low-frequency sound, including infrasound, generated by machines, industrial plants, vibrating structures, is characterised by its strong energy propagating over relatively large distances and affecting human health, comfort and activity. It has been found that if a person is exposed to low-frequency sound, he or she may have difficulty in carrying out mental work and may also experience some discomfort. The article discusses the negative effects of acoustic energy on human health, comfort and activity, which have also been confirmed by measuring the sources of low-frequency waves in the places where the residents complain. These are mainly low-frequency noise generated by powerful combustion processes, cogeneration units, diesel engines, vibrating piping systems of heating systems and wind turbines. It analyses the conditions of standing waves in residential areas as well as legislation assessing the limits of low frequency sound affecting human health and comfort. It also proposes measures to reduce low-frequency sound.