I just signed and shared - please amplify if you're a UK citizen, and start your own if you're in another country. The efficacy of properly fitting masks, and of HEPA airfilters is established by research. Those of us with compromised immune systems and post viral conditions can confirm their value.
Research re efficacy of masks & research into efficacy of HEPA airfilters was undertaken at Addenbrookes Hospital (Cambridge, UK). Its current bed occupancy= 95%. Recently visited its Out Patients Dept on a v busy day, one of only 7 people wearing a mask. No staff wore one, & saw no HEPA airfilters
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