This study found that the occasions during the day
when malodor were detected can be divided into four
different period, i.e. morning (6 a.m. to 10 a.m.), noon (12
p.m. to 2 p.m.), afternoon (2 p.m. to 4 p.m.), night (8 p.m.
to 10 p.m.) and the whole day. The survey found that the
period when foul odor were frequently detected was at
night (31.1% of respondents) followed by afternoon
(21.6%), noon (11.6%) and morning (7.4%). Interestingly
54 (28.4%) of the respondents claimed the foul smell
were detected throughout the day. Overall 172 (90.5%) of
the respondents strongly opined that foul smell was the
biggest environmental problem that they were facing.
Four main scenarios on the frequency of odor
pollution were assessed. They are once a day, once a
week, once a month and during the whole day. The survey
found out that the smell will eventually disappear but the
rate of disappearance was uncertain and perceived by
41.0% of the respondent as dependent on the general
weather situation with 9.5% thought the direction of the
wind was the main determinant while 3.7% related it to
the heat. In response to the eventual foul smell
disappearance, 15.3% said it happened after more than 6
h followed by 1-2 h (17.4%) and 3-4 h (11.1%).