In Perth there is a distinct daily sea breeze which occurs in summer. In the morning,
summer easterlies take pollution out over the sea and this pollution is bought back on
the sea breeze in the afternoon. Air studies in Perth in the 1980's established that
there was a hlaf hour daily spike in pollution levels as the sea breeze came in with
pollution levels rising to up to 10 times the average daily level.
In Sydney the situation is somewhat different since there is no distinct sea breeze.
However, the Perth measurements do indicate that, when the winds turn due to diurnal
effects( ie a sea breeze) or because of meteorological conditions i.e. a change in the
weather, then the maximum period of pollution is at the time of the wind change.
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