Possible toxicity of chronic carbon dioxide exposure associated with face mask use, particularly in pregnant women, children and adolescents - A scoping review.

The measured 2.4–2.6% CO 2 concentration translates into a highly significant increase in CO 2 with a KN95 respirator and a valved respirator at the nasolabial fold (p < 0.0001), which is much greater than the NIOSH 8h threshold limit value [ 57 ].

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