Present investigation gives a methodology of applicable work to the zone Chimbote – Coishco, determinándose the magnitude of the contamination at the mentioned zone for the heavy metals Lead, Arsenic and Iron, on the air, emitted by the Converter LD chimney of Chimbote steel industry for March, May, Julio and September months of the year 2008. Gaussian type's use of a model of atmospheric simple dispersion was applicable, in order to determine the impact of the atmospheric contaminant Lead, Arsenic and Iron, on the air, at your source's surroundings of emission at the mentioned zone, specifically at Coishco city, during the year 2008. With the sampling accomplished at the station of monitoring at Coishco city, obtained him for March month, 0,31 µg/m3 Pb in air, 0,004 µg/m3 of As in air and 3,41 µg/m3 of Fe in air concentration, underneath Permissible Exposición's Limites of 1,5 µ...