Masks and Face Coverings
March 12, 2021 | Canada
The Public Health Agency of Canada recommends the wearing of a 3-layer mask. Masks or face coverings can be homemade or purchased, and should:
- be made of at least 3 layers
- 2 layers should be tightly woven material fabric, such as cotton or linen
- the third (middle) layer should be a filter-type fabric, such as non-woven polypropylene fabric
- be large enough to completely and comfortably cover the nose, mouth and chin without gaping
- allow for easy breathing
- fit securely to the head with ties or ear loops
- be comfortable and not require frequent adjustments
- be changed as soon as possible if damp or dirty
- maintain its shape after washing and drying
Exhale valve masks are unsafe and should not be used. They allow infectious respiratory particles to spread outside the mask. These masks do not protect others from COVID-19 or limit the spread of the virus.
Two-layered masks are approximately 60% effective in trapping COVID-sized particles. Adding a third layer makes it approximately 80% effective.
This the current guidance and may change, especially as things develop with the COVID Variants of Concern (arising from England, South Africa, and Brazil).
Please see the following for more details:
- About Non-Medical Masks (Public Health Agency of Canada)
- COVID-19: Non-Medical Masks (Public Health Ontario)
- Video: How to wear a non-medical mask or face covering properly (Public Health Agency of Canada)
- World Health Organization: COVID-19 Masks
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