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2) MIT professors Martin Z. Bazant, who teaches chemical engineering and applied mathematics, and John W.M. Bush, who teaches applied mathematics, developed a method of calculating exposure risk to Covid-19 in an indoor setting that factors in a variety of issues...
3) that could affect transmission, including the amount of time spent inside, air filtration and circulation, immunization, variant strains, mask use, and even respiratory activity such as breathing, eating, speaking or singing.
4) Sing
Speak
Whisper
Breathe
All produce droplets that, without ventilation, remain in the air and can continue to infect.
The rule of 2 meters away, indoors, does not protect you from droplets.
Solution? Avoid indoor. Ventilate. Air disinfect.
Speak
Whisper
Breathe
All produce droplets that, without ventilation, remain in the air and can continue to infect.
The rule of 2 meters away, indoors, does not protect you from droplets.
Solution? Avoid indoor. Ventilate. Air disinfect.
5) How is aerosol different from large droplets? aerosol study indicates that coronavirus is persistent and stable for many hours. Typical air exchange every 20 min to 4 hrs, depending on ventilation. #COVID19
6) VENTILATION is key. Both ventilation and masks needed to reduce risk indoors. But most buildings not ventilated well enough.
7) “Until we recognise that #COVID19 is airborne we are setting ourselves up for repeated failure”
8) Now that aerosol transmission of the coronavirus is established, we need to disperse aerosols quickly. Key is ventilation. 
https://abs.twimg.com/emoji/v2/... draggable="false" alt="🇯🇵" title="Flagge von Japan" aria-label="Emoji: Flagge von Japan"> assumed it was airborne from the beginning. Here is how to ventilate your school classrooms if unable to open window. #COVID19
