![]() The filtered air is cleaned, and is then returned back into the room. Filtration means using a filter to remove viruses and other particles from the air.This is similar to opening windows to air out a stuffy room. Good ventilation replaces indoor air with fresh outdoor air through air exchanges. Ventilation means increasing the amount of fresh air that flows into a space.Keep gatherings or social activities outdoors as much as possible, as outdoors is lower risk than indoors.Screening people and asking them to stay home if they are sick or have symptoms of illness, including the flu or COVID-19, even if they are mild, will prevent further spread. People who have symptoms may also be more contagious.The risk increases the longer a person stays in the space, as well as when people are doing activities that cause heavy breathing, such as singing, dancing or exercising, especially without wearing a mask or keeping physical distance.Respiratory viruses spread more easily in the air, especially if it is a crowded indoor space with poor ventilation or air flow.How to Reduce the Spread from Respiratory Droplets and Aerosols: There are a number of things you can do to improve indoor air quality and help reduce the spread of viruses. ![]() When people gather together indoors, respiratory viruses, such as COVID-19 and the flu, can spread more easily. Visiting all health care settings (see video). ![]()
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