The influence of N95 and surgical masks on carbon dioxide levels: A comprehensive systematic review and meta-analysis.

Heliyon · 2024 · PMC11386028 · PMID 39258192

Europe PMC DOI

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an increasing trendno p-value reported

6 C) Although an increasing trend in CO2 concentration from low to high is visible, it is not significant. 3.2.3.

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a decreasing trendno p-value reported

Notably, while N95 masks showed an observable but statistically non-significant increase in CO 2 levels from low to high activity, surgical masks demonstrated a decreasing trend in CO 2 concentrations as activity levels escalated.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.