Particulate pollution is a term that covers a broad spectrum of specific pollutant types that permeate the atmosphere, where sources can be both natural and anthropogenic. Within urban areas, exhaust fumes from road traffic have been the most significant source (Watkins, 1991). PM10 is commonly classified into two further size groupings: coarse and fine. The coarse fraction includes all suspended particles in the PM10 size range above m in aerodynamic diameter, whilst the fine fraction contains the remaining. The coarse fraction has been judged to be made up mostly of natural and organic particles, whereas the fine fraction mostly particles of anthropogenic.
