Nepal 216 World Health Organization 80 prevention & control 61 Public Health 55 Knowledge 52 standards 51 Environmental health 48 Health aspects 47 Series 46 Environmental aspects 42 Water quality 39 Kathmandu 38 Pollution 38 Water Microbiology 38 Water Supply 38 Gezondheid 36 Quality Control 36 Water 36 Water Pollution 36 Water quality management 36 methods 35 Prevention 33 Guidelines 31 Public health 30 Children 29 Research 29 Environmental exposure 27 Prevalence 23 Epidemiology 22 World health 21