The chilling bite of winter doesn't always seem like it serves any purpose, but this year, one man has used it to demonstrate mask effectiveness in Canada.
A video embedded in a Reddit post from user michaelkbecker shows just how much a mask can do to reduce the spread of water droplets from your breath.
It shows a man in a vehicle on a very cold day in Saskatoon, first breathing without a mask to demonstrate how far his foggy breath can go from both his mouth and nose.
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He then puts the mask on, and it is apparent right away how effective it is.
While the water vapour in his breath is still partially visible coming through the fabric, there is significantly less of it escaping.
On top of that, it is not extending outward, but rather just drifting upward, meaning it would be difficult for it to reach other people unless they were already too close.
Masks have become an everyday part of life during the COVID-19 pandemic.
Canada's Chief Public Health Officer, Dr. Theresa Tam, recently recommended wearing ones that have three layers for added protection.