puits (1) population urbaine (1) pollution de la ville (1) santé publique (1) surveillance (1) cartographie (cartes) (1) hygiène (1) puisage des eaux souterraines (1) eau potable (1) distribution (1) consommation (1) automobile (1) Monitoring (1) Care and hygiene (1) City dwellers (1) Urban pollution (1) Overpopulation (1) Sewage (1) Rural-urban migration (1) Reservoirs (1) Public health (1) Population (1) Poor (1) Hygiene (1) Fashion (1) Drinking water (1) Collectors and collecting (1) Areas (1) Population (1) Quality (1)