Smart homes, smart cities, and… smart facemasks?

Since the onset of the coronavirus pandemic, facemasks have become a major, though not uncontroversial, aspect of daily life. 
Now, a study published in the scientific journal Nature by researchers from the University of Grenada has explored the creation of a smart facemask to help monitor the wearer’s inhalation of CO2. 
When wearing a mask, not all the CO2 that we exhale can perfuse through the material before we inhale again, thus increasing the amount of CO2 being rebreathed. 
But just how much more CO2 than normal are we breathing in when wearing a mask and what are its effects?
According to the study&rsquo…

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