alternative science: A mask traps in C02 and blocks out 02 molecules, but the much larger coronaviruses pass through freely.
Q: Does a mask trap in harmful pathogens?
A: Masks are like underwear. You should wear clean ones and change them daily. More frequently if you have a cold. If you cough up phlegm, spit it out into a tissue or something, not into your mask. Do not wear a moldy mask you found lying on the ground outside.
Q: Is it safe to do outside?
A: Unless we are talking about a very crowded urban area with stagnant airflow in a rare situation; you're not going to catch the rona going for a dam walk.