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Air purifiers and COVID-19

Many of you may still be wondering. Can an air purifier help kill COVID in the air?

Today, the admin would like to bring content from the lecture information. On city management during the COVID-19 epidemic by researchers working on indoor air quality management. Chulalongkorn University Summary of content for everyone to understand how air purifiers work with COVID-19, showing a simple picture.


Let's understand the spread of COVID-19.

As we know the COVID-19 virus is very small particles. When the virus spreads, it must use droplets as a carrier. A result study in China collected air samples from a Wuhan hospital. Droplets containing the COVID-19 virus were found to be 0.25-1.0 microns in size, which is the form of droplets in which the virus lives. and can cause infection Can be divided into 3 types.

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1. Large droplets come from coughing, sneezing or talking. These types of droplets are large. Suspended in the air, it does not take long for it to fall to various surfaces. But infection from these large droplets It will come from the distance between the infected person and the recipient being very close. The recipient receives the aerosol while it has not evaporated or fallen to various surfaces. This type of infection is called 'droplet infection'.

2. Small droplets come from larger droplets that float in the air and the water or liquid has evaporated. Until the droplets become much smaller, Therefore, they can be suspended in the air for a longer time. The recipient gets the infection through breathing in vapor droplets that enter the body. This kind of infection is called 'airborne infection' where the germs are suspended in these small droplets. Can stay in the air for up to 3 hours and if it falls onto various surfaces can last up to 72 hours.

3. Droplets that fall onto various surfaces. Then the recipient of the infection touches that surface and then touches the area of ​​the face that can carry the infection into the body. This type of infection is called 'contact infection'.

Let's understand how an air purifier works.

There are many levels of air purifiers, from general air purification. Until reaching the level of filtration that medical professionals choose to use. There are many types of air purifier working systems, such as electrostatic air purifiers. Air Purifier that use filters or air purifiers used in combination

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If talking about COVID-19, the admin would like to focus on air purifiers that have a better filtration grade for SARs CoV-2. We would like to recommend an air purifier that has been researched to help inhibit SARs. CoV-2 is

  • Air Purifier with PCO Technology (Photo Catalytic Oxidation)

  • Air Purifier with UVGI (Ultraviolet Germicidal Irradiation)

  • Air purifier with HEPA filter (High Efficiency Particulate Air Filter)

Air Purifier with PCO (Photo Catalytic Oxidation) The function of this Air Purifier is that it uses a catalyst to react with light. To be able to kill viruses and bacteria, including SARS-CoV-2, for example by using titanium dioxide to stimulate various reactions under conditions with UV light. Research has found that It can inhibit viruses and bacteria, including SARS-CoV-2, but as of now, there are no results from trials testing it in general settings. Not inside the lab. There will be other factors involved that affect the ability of the PCO air purifier, such as humidity in the air and other pollutant gases, etc.

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Air Purifier with UVGI (Ultraviolet Germicidal Irradiation) The way this purifier works is by using UV light. (Ultraviolet) used to kill germs or make them ineffective. Both viruses Bacteria and mold, the U.S. Environmental Protection Agency (USEPA) classifies the use of UVGI in residences into 2 types:

1. Disinfecting particles suspended in the air, such as portable air purifiers with UV lamps

2. Surface cleaning It is commonly used in the building's central ventilation air conditioning system. Using a UV lamp to irradiate surfaces that may have germs on them.

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Air purifier with HEPA filter HEPA, the abbreviation for High-Efficiency Particulate Air Filter, is a high quality air filter. Made from many small-sized fibers, it can filter and capture at least 99.97% of particles as small as 0.3 microns. The CDC recommends using this type of air purifier to help stop germs in another way.

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In conclusion..air purifiers really help with the Coronavirus (COVID-19)?
Based on lecture information On city management during the COVID-19 epidemic by researchers working on indoor air quality management at Chulalongkorn University stated that
United States Environmental Protection Agency (USEPA) has answered questions that ..

" Proper use of air purifiers can help reduce virus-carrying droplets inside the home. However, only using an air purifier is not enough to prevent virus infection. Which can consider using a HEPA air filtration system and using a UVGI air sterilization system together as well. " 
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Additionally, the CDC recommends taking preventive measures against COVID-19. strictly such as:

1. Wearing a mask when around others.

2. Keeping distance.

3. Ventilation to provide new air transfer all the time.

4. Cleaning various surfaces that are shared with others.

5. Washing hands whenever doing activities.

Thank you for the source: On city management during the COVID-19 epidemic by researchers working on indoor air quality management at Chulalongkorn University

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