“…29 It has been stated that the combustion of MMT may be one of the main sources of inorganic Mn contamination in the urban environment, particularly in areas of abundant traffic. 19,30,31 This contamination may have led to an increase in inorganic Mn, as was the case with Pb from gasoline. 11,32,33 The Toronto Manganese Personal Exposure study, carried out by the Research Triangle Institute in 1995-1996 and reported in 1998, showed that airborne Mn resulting from the combustion of MMT was not entering the Canadian environment at atmospheric levels that could constitute a health risk.…”