Important: This is NOT an anti-masking post. It is a scientific experiment to show facts regarding what a COVID-19 mask wearer might have to deal with in partly breathing their own breath back in with every breath, so the wearer can be informed and decide when they would want to do it and not within the law, not against the law. The decision is not to obey or disobey the law, but rather to obey the law and do something requiring mask wearing, or abstain from it because the impact isn’t worth the activity. For example, go shopping in a mall with a mask (required where I am), or not and do online shopping or window shopping from the street, NOT go shopping in a mall without a mask.
I recently got the new 2nd edition Awair air quality monitor.