Wind Direction and Particulate Air Pollution

Particulate matter (PM) levels are strongly influenced by wind direction. A clear trend can be shown by plotting this variable against PM concentrations, averaged according to their associated wind directions:

The graph shows a marked increase in average PM levels when there is an easterly wind direction. These findings are consistent with published literature which describes how long range transport of PM2.5 from continental Europe can significantly contribute to PM levels and underlie many air pollution episodes.


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