The virus that causes COVID-19 has been reported to be a tiny 0.125 microns in size and airborne transmission is “plausible,” according to a study published in The New England Journal of Medicine from scientists at Princeton University, UCLA and the National Institutes of Health. The researchers concluded that the virus could remain airborne for “up to 3 hours post aerosolization.”   

Social distancing, hand washing, cleaning surfaces often, keeping your immune system strong and going out in public with a mask are key ways to protect yourself.  A good air purifier can help as well by ensuring that the air around you in your home and office is clean (it can help with COVID-19 as well as with mold, allergens and pollutants).  Many air purifiers promote True HEPA filtration and catch up to 99.9% of allergens, pollutants, viruses and molds down as small as 0.3 microns.   Given that  COVID-19 is 0.125 microns,  please make sure that the air purifier you choose can actually filter the virus particles and that the purifier does not emit dangerous substances like ozone, hydroxyl, or photocatalytic oxidation. You’ll also want to make sure that your purifier has a CADR(clean air delivery rate) of at least 240 which means that it can perform about five air exchanges per hour in the suggested room size as the faster air can cycle through the filter, the better its chances of catching particles.  

It is best to run your air purifier 24 hours a day and if someone is sick, put the purifier in the sick person’s room.   If you can’t invest in an air purifier right now, opening the doors and windows and letting air flow through your home or office can help (even if it is just in the morning). 
Here are a few verified air purifiers (please let us know if you find others):

1. AirDoctor• 100x more effective than HEPA air filters. UltraHEPA filter removes 99.95% of particles as small as .003 microns.• Auto Sensor measures and adjusts filtration level instantly to air quality with visible light sensor      

2. IQAir HealthPro Plus Air Purifier• Proven filtration for both particles and gaseous pollutants• Proven to filter particles down to .003 microns• used by the Hong Kong Hospital Authority to help combat the spread of the deadly SARS virus and other contagious viruses.

3. Intellipure UltraFine 468• Energy efficient, using only 5 watts per hour when on low• Proven to be 40x more efficient than HEPA filters• Removes 99.99% of harmful viruses, fungi molds, and bacteria, down to .007micron in size.• Currently in use at hospitals, medical clean rooms, and military applications.

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