Can be transported long distances. Acid Aerosols Formed when pollutants Inhalation of contaminated such as sulphur dioxide air. Very small pieces of solid Inhalation of contaminated or liquid matter that vary air. Can be coarse or fine. Fine particles arise mainly from man-made sources such as combustion of fuels, and include sulphates and nitrates as well as metals.
Coarse particles consist largely of naturally occurring substances, particularly soil.
Great Lakes Health Effects Program, Health Canada, 1993.