prevention & control 42 Health aspects 40 standards 40 Environmental health 39 Public Health 39 Environmental aspects 38 Water quality 38 Gezondheid 36 Pollution 36 Quality Control 36 Water 36 Water Microbiology 36 Water Pollution 36 Water Supply 36 Water quality management 36 Nepal 31 Series 24 Environmental exposure 12 World Health Organization 12 Health Research 11 Journal of NHRC 10 Journal of Nepal Health Research Council 10 Health Services Research 8 Health Surveys 8 Prevention 8 Education 7 Risk assessment 7 International Programme on Chemical Safety 6 Public health 6 Cancer 5