None of these articles you posted indicate masks
Posted on: October 14, 2020 at 14:24:28 CT
SuperTone
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do not increase CO2 levels (except the blatantly false one at the bottom). These articles are saying they do not increase levels enough to create acute CO2 toxicity which was never a said to be a huge issue.
The big issue is long term exposure of "elevated" CO2 levels. This can increase the size of red blood cells and impact many other things that have long term impacts.