  It is a widely accepted view that COVID 19 is either transmitted via surface
contamination or via close contact of an un-infected person with an infected
person. Surface contamination usually happens when infected water droplets from
exhalation/sneeze/cough of COVID sick person settle on nearby surfaces. To curb
this, social distancing and good hand hygiene advise is advocated by World
health Organization (WHO). We argue that COVID 19 coronovirus can also be
airborne in a puff cloud loaded with infected droplets generated by COVID sick
person. An elementary calculation shows that a $5~\mu m$ respiratory infected
droplet can remain suspended for about 9.0 minutes and a $2~\mu m$ droplet can
remain suspended for about an hour! And social distancing advise of 3 feet by
WHO and 6 feet by CDC (Centers for Disease Control and Prevention) may not be
sufficient in some circumstances as discussed in the text.
