Monitoring long-term variation of aerosol composition: a dual particle-size approach applied to Hong Kong.

The 1990's time series in Hong Kong for various components of total suspended particulate matter (TSP) and PM10 have been analyzed in order to assess two distinct types of anthropogenic input. The first of these relates to the immense reclamation and construction activities for new developments and airport construction. The concentrations of crustal components in PM > 10 (= TSP - PM10) were found to peak at the time of this maximum activity. A second type of anthropogenic input, ambient lead from petrol vehicles, has decreased in Hong Kong and now represents a regional background. Ambient bromine now arises mainly from the seasalt source.