How to keep air clean during coronavirus outbreak

Some scientists are now raising concerns over the potential risk of infection of COVID-19 through the inhalation of smaller particles.
3:21 | 07/07/20

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Transcript for How to keep air clean during coronavirus outbreak
We are back now with the reality check on how to keep the air clean indoors during the coronavirus outbreak. There are new questions this morning after the claim by hundreds of scientists that small particles of the virus can linger in the air longer than you may think. Becky Worley has some possible solutions for us. Good morning, Becky. Reporter: Good morning, robin. We thought of the coronavirus as mostly spread through large cough or sneeze droplets like this. But this new letter from scientists is raising concerns over the potential risk of infection through the inhalation of smaller particles like this from a sprayer. They can hang in the air and that's what people are worried about especially indoors so what can we do to filter them out? It's in the air. That's what a group of 239 scientists representing 32 countries reported to the world health organization asking for a revision to the w.h.o.'s recommendations for covid-19 due to evidence showing the disease is airborne. Studies strongly suggest that airborne transmission of this disease is happening. Reporter: Those social distancing is heavily advised how do you distance from a cloud of undetectable particles in the air? This video shows how far droplets can travel without a a cloud of particles can spread as far as eight feet. And we've seen how according to a Chinese study that a woman with no symptoms in a windowless indoor restaurant spread the virus to nine people. Up to 15 feet away. Droplets in her breath possibly carried from the air conditioner. Most air-conditioning systems bring it very little outside air, so there's very little dilution of the particles generated that transmit this infection. Reporter: So could air purifiers be the key to cleaning the air in our homes, especially if we're living with someone who is sick or a frontline worker who is self-quarantining? Experts say, yes. While scientists are still learning how many particles you can be exposed to before getting infected, if someone in your household is sick with covid-19, "Consumer reports" suggests that running an air purifier in their quarantine room may help protect other family members or care givers, the same goes for health care workers self-quarantining when they come home. "Consumer reports" listing their top picks for purifiers that while not tested specifically on covid-19 particles "Consumer reports" suggest they can filter out other germ and virus particles in similar tiny sizes. I bought the Honeywell hpa model because it was the highest rated on "Consumer reports" for under $250. These things can be pricey. So even if you don't buy a stand-alone filtration device experts say one of the best things can you do to improve air quality is open the windows or screened doors to circulate more fresh air. Experts say that in order to control infection in homes ventilation should move the air at least six times per hour, the more airflow the better especially if it's crowded. But they're still trying to figure out best tras for our ventilation systems, robin. There is no silver bullet here. No, there is not but great information as always from you, Becky. Thank you.

This transcript has been automatically generated and may not be 100% accurate.

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