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Aerosols are microdroplets, much smaller than respiratory droplets, and take a longer time to drop to the floor. They will be expelled by people breathing, laughing, or singing, unlike respiratory droplets that are expelled with forceful acts such as sneezing or coughing. According to scientists, a 5-micron droplet will travel tens of meters and also remain suspended in the air for longer. Thus an individual who is COVID-19 positive is likely to infect people standing even at a distance of 1-2 m in a small, poorly ventilated room.

Source: The Hindu