Nepal 55 prevention & control 44 Environmental health 39 standards 39 Environmental aspects 37 Public Health 37 Water quality 37 Gezondheid 36 Health aspects 36 Pollution 36 Quality Control 36 Water 36 Water Microbiology 36 Water Pollution 36 Water Supply 36 Water quality management 36 methods 10 Knowledge 9 Education 8 Health Services Research 8 organization & administration 8 therapy 8 Child 7 Guidelines 7 Children 6 Health Surveys 6 Kathmandu 6 Prevention 6 World Health Organization 6 COVID-19 5