A noise usually has influence on
two groups of people:
(a) The occupants of a site, house or
(b) Third party people like persons
living and working in the locality.
When dealing with problems caused by
noise, one must consider three different aspects of its effect on people and they are
annoyance, communication interference, and hearing-damage risk. Although there is no
single widely accepted standard for indoor noise environments, there have been numerous
studies which provide recommended dB(A) levels for specific situations. Table Cl lists
dB(A) level indoor design goals and NC criteria recommended in the ASHRAE system guides
for steady background noise in various indoor spaces.