From the data presented here, it can be concluded that environmental exposure to lead is a particularly severe problem in Mexico.  As has been shown, there are very important sources of exposure to this metal:

     (a) for rural populations who manufacture and/or utilize lead-glazed pottery, 

     (b) for urban populations who are exposed to high air lead concentrations due to the continued use of

           lead fuel additives, 

     (c) for workers of several industries, mainly those of batteries and pigments, 

     (d) for consumers who routinely eat canned foods such as hot peppers and fruit products, and 

     (e) for the general population living in the vicinity of smelters, refineries and other industries that emit lead.  

Therefore, in Mexico only those native populations living in very primitive communities, far away from  all civilized life, could be expected to be free from this exposure.  At the same time, and despite the relatively few data available, it can be stated that the exposure to lead of populations in Mexico could be approaching levels that might be highly hazardous, in particular for the neuropsychological health of children.  Regarding the presence of lead in the environment, despite the fact that the available studies are not enough, it is evident that pollution by this metal is widespread and that there is a serious lack of studies for most regions of the country, including several that might be expected to be highly polluted.  At the same time, it is evident that the official attention paid to the problem, either in regulations, support of further studies, or implementation of effective control measures has been far from the level needed according to the available data.