prevention & control 62 Environmental health 38 Health aspects 38 Prevention 37 Public Health 37 Environmental aspects 36 Gezondheid 36 Pollution 36 Quality Control 36 Water 36 Water Microbiology 36 Water Pollution 36 Water Supply 36 Water quality 36 Water quality management 36 standards 36 Nepal 30 World Health Organization 26 Knowledge 16 Kathmandu 9 AIDS (Disease) 7 Epidemiology 7 Guidelines 7 Public health 7 World health 7 Research 6 Violence 6 World Health 6 epidemiology 6 Awareness 5