Beginning at 7 am on Saturday morning, the answer to that question here in Maryland could be anyone riding on mass transit or patronizing a food service or retail establishment. Governor Hogan has ordered that a face covering that covers both the nose and mouth shall be worn by anyone using public transportation or by anyone older than 7 in a food service or retail establishment until the end of the current Wuhan virus emergency. Willful failure to comply will be a misdemeanor punishable by a year in jail and/or a $5,000 fine.
It seems to me that this sort of public health intervention makes more sense than some parts of the stay-at-home order, particularly as we pass the peak in the pandemic curve. Going to about our business wearing masks will be less economically disruptive than hiding. Perhaps this can be a first step to easing up on some restrictions as it becomes more obvious that some are doing more overall harm than good.