This prohibition on masks with valves has been in effect in many places in the bay area for months with the accompanying signage, verbal directions and public admonishments, etc.
Ironically, what this means is that instead of wearing a tight, form fitting, purpose built mask with, perhaps 0.5-1.0 square inches of exhaust, we have loose, floppy fabric masks - many without any below chin attachment - with 4 or 8 or 10 square inches of "exhaust".
A local organic, progressive grocery chain in Marin County will stop you at the door with a vented P100 mask but a flowy, loose fitting bandana, totally open across the bottom goes right in.
Setting aside the safety or epidemiological ramifications of this, it is fascinating and stupefying to witness these social evolution play out in front of us ...
Ironically, what this means is that instead of wearing a tight, form fitting, purpose built mask with, perhaps 0.5-1.0 square inches of exhaust, we have loose, floppy fabric masks - many without any below chin attachment - with 4 or 8 or 10 square inches of "exhaust".
A local organic, progressive grocery chain in Marin County will stop you at the door with a vented P100 mask but a flowy, loose fitting bandana, totally open across the bottom goes right in.
Setting aside the safety or epidemiological ramifications of this, it is fascinating and stupefying to witness these social evolution play out in front of us ...