Using meteorological and air quality variables recorded every 2 s,
average meteorological and air quality, and equivalent sound level
values were calculated for the exact period when each interview was
conducted. The interviews were carried out at a distance of at least
5 m from the sound level metre, to avoid influencing the noise levels.
The participants in the surveys included students and staff, selected
at random, from the areas under investigation. They were asked to
answer all the questions with direct reference to the site they were
interviewed at and for the specific moment in time; as opposed to their
general impression of the area.