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Sound vs Noise People react to sounds in different ways. We take most sounds for granted, but in some situations a sound can distract us and break our concentration. When this happens, the sound becomes unwanted noise. Often, it is not the pitch or the loudness that makes a sound an annoying noise. Sometimes it is the repetitive nature of the sound and our inability to control it that makes it annoying. In reality whether or not a sound constitutes noise depends on the circumstances in which it is made: loud parties, late at night, might be enjoyed by those who are at the party but the next door neighbours, trying to sleep, may well complain about it being too noisy! Thus noise can be considered as a form of air pollution, but sound is not. Check that you understand what these words mean in this document To take something for granted: to believe something to be the truth without even thinking about it. Concentration: the act of give all our attention to something. Circumstances: certain conditions.