Buzz
Wearing two masks can significantly boost filtration efficiency. The CDC now suggests doubling up on masks or choosing multi-layered options while ensuring a snug fit for maximum effectiveness.
According to the CDC, effective layering methods include:
Placing a cloth mask over a disposable or surgical mask
Opting for a cloth mask with several layers of fabric
Using two disposable masks isn’t effective due to their loose fit, the CDC notes. They also caution against pairing any mask with a KN95, though the specific reasoning isn’t provided.
The CDC emphasizes the importance of a proper mask fit. Adding more layers increases the likelihood of air escaping through the edges, as it seeks the path of least resistance.
Masks vary in effectiveness
Cloth masks alone were never the ideal choice for pandemic protection; they were simply the most practical solution to distribute masks widely without depleting supplies needed by healthcare workers.
Masks can be ranked on a spectrum from highly effective (e.g., a well-fitted N95) to minimally effective (e.g., a loosely tied bandana). Disposable surgical masks rank relatively high, while cloth masks with two or three layers fall in the middle. Unfortunately, after a year of the pandemic, there’s limited authoritative research on cloth mask effectiveness, but tighter weaves and more layers generally improve performance.
This is why double masking is increasingly common. For instance, poet Amanda Gorman wore two masks at the inauguration (except while speaking). Similarly, Germany now mandates N95 or equivalent masks for shopping or public transportation.
Why the emphasis on improved masks now?
There are three key reasons. First, data confirms masks protect wearers from small aerosol droplets, not just their own respiratory particles. Second, medical-grade masks are now more accessible than during the initial shortages. Third, new coronavirus variants appear more contagious, necessitating greater efforts to block transmission, including filtering smaller droplets. Why not take extra precautions if available?
Keep in mind, a mask’s effectiveness depends on its fit. If you feel or see air escaping around the edges, gaps exist where unfiltered air can pass. Masks reduce risk but aren’t foolproof, so avoiding indoor gatherings with non-household members remains advisable.
