As recommended by the World Health Organisation:
To protect others and prevent the spread of germs through coughs and sneezes.
Remember, masks are only effective when used in combination with frequent hand washing.
Before putting a mask on, make sure hands are washed.
Make sure there are no gaps between your face and the mask.
Avoid touching the mask whilst using it.
Share or reuse masks.
Use a mask once wet.
Remove the mask from behind the ears to avoid touching the mask and dispose immediately in a closed bin.