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How can airborne transmission of COVID-19 indoors be minimised?
Environment International
Volume 142, September 2020, 105832

Portable consumer air cleaning devices may be beneficial in smaller rooms, although it should be recognised that such devices must be appropriately sized for the space (Miller-Leiden et al., 1996). There is wide variation in performance of air cleaners depending on air cleaner design and size of room in which it is used (Shaughnessy and Sextro, 2006). A useful metric for determining performance is the clean air delivery rate, which is equivalent to the volumetric flow rate of particle-free air produced by the air cleaner (Foarde, 1999). Kujundzic et al. (2006) reported air cleaners were similarly effective against removing both airborne bacterial and fungal spores from the air at clean air delivery rates of between 26 and 980 m3/h corresponding to effective cleaning of between 5 and 189 m3 room volumes respectively.

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the company designed suitcase-sized shipping containers that will keep its doses at ultracold temperatures for up to 10 days. Each container holds between 1,000 and 5,000 doses, the newspaper reports.

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The boxes will be outfitted with a GPS tracker that will allow the company to track the shipments from a control tower where the company will work to ensure shipments don't experience temperature diversions. The box can then be refilled with dry ice at the dosing location to keep the vaccine at the correct temperature for storage.