why do we need proper ventilation,sanitation and hygiene? 

We need proper ventilation,sanitation and hygiene in order to stay healthy and away from diseases. 

• Ventilation in our houses and surrounding give us fresh air and sunlight. They are also important apart from food to stay healthy because fresh air gives us oxygen to breathe and sunlight kills germs and gives us Vitamin D. 
• Proper sanitation keeps the germs away which cause various harmful diseases. 
• Hygiene is required to have a clean and healthy body and environment.