Wearing a high grade mask known as an FFP3 can provide up to 100% protection. By contrast, there is a far greater chance of staff wearing standard issue surgical masks catching the virus.

But how, he wondered, could FFP3 masks be thought essential one day but not the next? How could the risk from infectious aerosols suddenly vanish? These were questions that would increasingly ...

(5) FFP masks - These masks are manufactured in Europe and are available in three varieties - FFP1, FFP2 as well as FFP3. The third variety are highly efficient for filtering out as high as ninety ...

The SPF said some officers would have to shave twice a day for the FFP3 masks to work and warned the edict would mean they faced misconduct charges if they refused. Police Scotland was forced to ...