@[DrEricDing] Indoor air ventilation is needed to clear aerosols & reduce airborne transmission risk. Video demonstrates time nee… https://t.co/C7SexKxxsC (Maurice de Hond)
9 juli 2020 22:02:28
@[DrEricDing] Indoor air ventilation is needed to clear aerosols & reduce airborne transmission risk. Video demonstrates time nee… https://t.co/C7SexKxxsC (Maurice de Hond)