It's recommended one wears a face mask when working with potting mixtures and I have had a box of masks stashed away in the greenhouse for that purpose. These days, those masks have taken on a whole new meaning as we all do our part to stop the spread of the coronavirus that causes Covid-19.
A vast majority of Americans who have been exposed to the virus don't know it. People and organizations can fight the spread of coronavirus by taking steps to prevent transmission of the disease. Remember that the whole point of widespread cancellation of events is to create social distancing that can lower the infection rate and prevent health care systems from being overwhelmed.
Your mask is one more tool to protect others from the potential transmission of the virus you may be carrying with our even knowing it.