The spread of the coronavirus in bars, restaurants and offices is suggesting that the virus lingers in the air indoors, infecting those nearby, according to an article on The New York Times website.
In an open letter to the World Health Organization (WHO), 239 scientists in 32 countries have outlined the evidence showing that smaller particles can be infectious, and are calling for WHO to revise its recommendations.
WHO has said that the coronavirus is spread primarily by large respiratory droplets that once expelled fall quickly to the floor. Its latest update, WHO.said airborne transmission of the virus is possible only after medical procedures that produce aerosols.
Ventilation systems in schools, nursing homes, residences and businesses may need to minimize recirculating air and add powerful new filters. Ultraviolet lights may be needed to kill viral particles floating in tiny droplets indoors, according to the article.
Ventilation and Filtering for Infection Control 
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