Effective ventilation key factor to stop Covid-19 spread: St
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New research adds to the growing body of evidence that effective or proper indoor ventilation may be a key factor in preventing the spread of Covid-19 virus, according to a study published in the journal Environment International.

Key Insights:

• SARS-CoV-2 is rather moderately infectious and a person would need to remain in a poorly ventilated room for a considerable amount of time to receive an infectious dose of SARS-CoV-2.

• Virus is transmitted via saliva droplets with a size from 0.5 micrometer up to a few thousand micrometers produced by a person by talking, sneezing, coughing, or even just breathing.

• Until this spring, it was held in the medical literature and guidelines that droplets larger than 5 micrometres fall down at the distance of up to 2 meters.

• By now, however, aerosol physics shows convincingly that in reality only droplets larger than 50 micrometres fall down at a distance of 2 meters, while smaller ones remain suspended in the air and travel farther.

According to study, the following engineering controls targeting airborne transmission should be applied as a preventive measure in indoor spaces:

• Sufficient outdoor air ventilation should be applied as the main control (in principle, it does not matter whether outdoor air enters through a ventilation supply duct or a window, the amount of air is important);

• If the building does not have a functioning ventilation system, portable air cleaners with fine particle filters should be used to clean indoor air;

• in addition, viral contamination can be deactivated by applying short-wavelength ultraviolet (UV-C) light, which is used for example in certain hospital settings.

Source: https://linkinghub.elsevier.com/retrieve/pii/S0160412020317876
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