![IJERPH | Free Full-Text | Is a Mask That Covers the Mouth and Nose Free from Undesirable Side Effects in Everyday Use and Free of Potential Hazards? IJERPH | Free Full-Text | Is a Mask That Covers the Mouth and Nose Free from Undesirable Side Effects in Everyday Use and Free of Potential Hazards?](https://www.mdpi.com/ijerph/ijerph-18-04344/article_deploy/html/images/ijerph-18-04344-g003.png)
IJERPH | Free Full-Text | Is a Mask That Covers the Mouth and Nose Free from Undesirable Side Effects in Everyday Use and Free of Potential Hazards?
![Carbon dioxide rises beyond acceptable safety levels in children under nose and mouth covering: Results of an experimental measurement study in healthy children - ScienceDirect Carbon dioxide rises beyond acceptable safety levels in children under nose and mouth covering: Results of an experimental measurement study in healthy children - ScienceDirect](https://ars.els-cdn.com/content/image/1-s2.0-S001393512200891X-ga1.jpg)
Carbon dioxide rises beyond acceptable safety levels in children under nose and mouth covering: Results of an experimental measurement study in healthy children - ScienceDirect
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![Larger than life-sized limestone mask from Göbekli Tepe (© DAI, Photo... | Download Scientific Diagram Larger than life-sized limestone mask from Göbekli Tepe (© DAI, Photo... | Download Scientific Diagram](https://www.researchgate.net/publication/323512855/figure/fig4/AS:599684917764112@1519987434979/Larger-than-life-sized-limestone-mask-from-Goebekli-Tepe-C-DAI-Photo-K-Schmidt.png)
Larger than life-sized limestone mask from Göbekli Tepe (© DAI, Photo... | Download Scientific Diagram
![Miniature mask from Nevalı Çori (courtesy of H. Hauptmann, drawing K.... | Download Scientific Diagram Miniature mask from Nevalı Çori (courtesy of H. Hauptmann, drawing K.... | Download Scientific Diagram](https://www.researchgate.net/publication/323512855/figure/fig2/AS:599684917755910@1519987434865/Miniature-mask-from-Nevali-Cori-courtesy-of-H-Hauptmann-drawing-K-Schmidt.png)
Miniature mask from Nevalı Çori (courtesy of H. Hauptmann, drawing K.... | Download Scientific Diagram
![IJERPH | Free Full-Text | Is a Mask That Covers the Mouth and Nose Free from Undesirable Side Effects in Everyday Use and Free of Potential Hazards? IJERPH | Free Full-Text | Is a Mask That Covers the Mouth and Nose Free from Undesirable Side Effects in Everyday Use and Free of Potential Hazards?](https://www.mdpi.com/ijerph/ijerph-18-04344/article_deploy/html/images/ijerph-18-04344-g004.png)
IJERPH | Free Full-Text | Is a Mask That Covers the Mouth and Nose Free from Undesirable Side Effects in Everyday Use and Free of Potential Hazards?
![IJERPH | Free Full-Text | Is a Mask That Covers the Mouth and Nose Free from Undesirable Side Effects in Everyday Use and Free of Potential Hazards? IJERPH | Free Full-Text | Is a Mask That Covers the Mouth and Nose Free from Undesirable Side Effects in Everyday Use and Free of Potential Hazards?](https://pub.mdpi-res.com/ijerph/ijerph-18-04344/article_deploy/html/images/ijerph-18-04344-g005.png?1618903857)
IJERPH | Free Full-Text | Is a Mask That Covers the Mouth and Nose Free from Undesirable Side Effects in Everyday Use and Free of Potential Hazards?
![As viral infections skyrocket, masks are still a tried-and-true way to help keep yourself and others safe As viral infections skyrocket, masks are still a tried-and-true way to help keep yourself and others safe](https://bloximages.newyork1.vip.townnews.com/tulsaworld.com/content/tncms/assets/v3/editorial/2/6e/26e6ee78-b120-543b-97b1-868682245121/639a2464a4809.preview.jpg?crop=1763%2C926%2C0%2C125&resize=1200%2C630&order=crop%2Cresize)