• Gary Moller

How a mask affects the air you breathe

(Updated 19/07/21)

Image of David
Misplaced, a health hazard or both?

Bruce, an engineer, who works with gases and trusts his instrument, sent this short video.

What is going on here is not so much a drop in oxygen levels but an increase in CO2 levels to the point where safety limits for a workspace are being exceeded.


When higher concentrations of exhaled CO2 displace oxygen in breathed air the following can occur: rapid breathing, rapid heart rate, clumsiness, emotional upsets and fatigue. As less oxygen becomes available, there may be nausea and vomiting, collapse, convulsions, coma and, finally, death.


If you suffer any of these and wearing a mask, my advice is to take it off immediately and see a doctor.


It is worth noting that some health professionals say there has been an increase in anxiety and depression since the Pandemic took hold. Things are stressful enough without adding to the problem by wearing a mask when it is not needed, or for long periods without a break.


Wearing a mask may increase a person's risk for serious respiratory infections, including pneumonia, due to continual rebreathing of stale and infected air.


If you must wear a mask, take it off the moment the need has passed.


However, just having elevated CO2 levels may only be the initial trigger for more, namely a drop in arterial CO2:


To explain why arterial CO2 may drop, Buteyko Breathing expert, Glenn White wrote this for me:


Can You breathe Through Your Nose When Wearing A Mask?


The main problem when wearing a mask is that many people have dysfunctional breathing. If these people wear a mask, they will struggle to breathe through their nose. The reason for this has less to do with oxygen and more to do with carbon dioxide (CO2).


Far from being a waste gas, CO2 is essential for optimal respiration. It is so vital that CO2 levels in the blood govern every breath. Wearing a mask can cause the following unintended negative consequences for people who have dysfunctional breathing and increased sensitivity to CO2:

  1. CO2 in the airways and blood rises to uncomfortable levels, thereby excessively stimulating the urge to breathe.

  2. An elevated urge to breathe is likely to lead to mouth breathing, bypassing nasal filtration, and the body’s immune defences.

  3. Mouth breathing means a reduction in nitric oxide, a potent anti-viral, anti-bacterial and anti-fungal gas produced in the paranasal sinuses.

  4. Breathing more may expose the mask wearer to more airborne germs.

A stimulated breathing pattern can also lead to a phenomenon known as respiratory alkalosis. Respiratory alkalosis is where an increase in breathing and drop in arterial CO2, known as hypocapnia, can reduce oxygen delivery to cells. The mechanism for this is vasoconstriction and the Bohr Effect, which reduce oxygen delivery to cells when arterial CO2 drops below an optimal level.