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.