The CDC Says, “No”, and provides masks wearing tips for cold weather
Everyone 2 years of age and older should wear a mask in public settings and when they are around people who do not live in their household. COVID-19 spreads mainly from person to person through respiratory droplets. Respiratory droplets travel into the air when you cough, sneeze, talk, shout, or sing. These droplets can then land in the mouths or noses of people who are near you or they may breathe these droplets in.
Masks are a simple barrier to help prevent your respiratory droplets from reaching others. Studies show that masks reduce the spray of droplets when worn over the nose and mouth.
But does wearing a mask cause you to breathe unhealthy air?
According to the CDC, wearing a mask does not raise the carbon dioxide (CO2) level in the air you breathe. A cloth mask does not provide an airtight fit across the face. The CO2 completely escapes into the air through and around the sides of the cloth mask when you breathe out or talk. CO2 is small enough to easily pass through any cloth mask material. In contrast, the virus that causes COVID-19 is much larger than CO2, so it cannot pass as easily through a properly designed and properly worn cloth mask.
In cold weather, masks may become wet from breathing, snow, or other precipitation. Change a mask when it becomes wet. A wet mask is harder to breathe through, is less efficient at filtering, and vents more around the edges of the mask. It is especially important to have one or more replacement masks during cold weather. If your reusable mask becomes wet, put it in a sealed plastic bag until you can wash it.
Scarves and other headwear such as ski masks and balaclavas used for warmth are usually made of loosely knit fabrics that are not suitable for use as masks to prevent COVID-19 transmission. They can be worn over a mask.
If you wear glasses, find a mask that fits closely over your nose or has a nose wire to help reduce fogging. Consider using an antifogging spray that is made for eyeglasses.