Turn off your air conditioning, experts say after WHO shifts stance on airborne coronavirus

[wrbtrader]

School boards, some scientists puzzled after Quebec says classroom air filters don't work

Wow...

• https://montreal.ctvnews.ca/school-...ys-classroom-air-filters-don-t-work-1.5259702

wrbtrader

 

[mlawson71]

So purifiers do work if properly installed?