whom when looking for rapid industrialization, sometimes
neglected the basic environmental control of
hazardous metallurgic industries, resulting in severe
metal pollution of environmental media, increasing the
risk of toxic exposure of human populations to metals
and other inorganic and organic pollutants [1]. Site studies
showed that dust and soil were the main pathways
to human exposure, particularly in children [8,15]. Until
now, there had been no evidence indicating that drinking
water had significant concentrations of lead and
therefore, it did not represent a significant pathway for
lead exposure [8]. Also, since 2000, lead concentrations
in the air have reached consistently trimester averages <
1.5 μ/m3, which is the Mexican Standard [16].