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Thank you for your calculation including the volume of the mask itself. For several years I have had to wear a cloth mask with an activated carbon filter in public due to severe allergy to several artificial fragrances, particularly to those in laundry products that are on nearly everyones' clothing, vapes, air fresheners, etc. I found that masks that did not fit snugly against my face (not the perimeter of the mask which needs to be snug) caused dizziness and near-fainting. I reasoned that, as your calculation shows, the amount of exhaled air remaining in the mask when I inhaled was the problem. I switched to a carbon-filtered mask that sits much closer to my face, reducing the volume of exhaled air, and that solved the problem. When I saw Bigtree's video, I knew he was failing to consider the volume of exhaled air in the mask mixing with the fresh air being pulled through the mask. My question is even though the level of carbon dioxide being inhaled in your average mask is not as severe as Bigtree's video asserts, could breathing that higher total concentration result in a CO2 level building up in the blood over the time the mask is worn? Would breathing in 4000+ppm of CO2 result in a static elevated blood level or would the level in the blood continue to rise during the period of mask-wearing? At what point is the body's ability to exhale the excess CO2 overwhelmed by the incoming amount?

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I have COPD and wearing a masks raises my blood pressure within a few minutes.

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