Air Purifiers for Pathogens at

Air Purifiers for Pathogens

Dangers of Pathogens

Pathogens are infectious microorganisms or agents such as bacteria, microbes, viruses (including coronaviruses), germs, fungus (fungi). While the vast majority of bacteria are harmless or even beneficial to humans, some pathogenic bacteria are highly prone to cause globally significant infectious diseases such as tuberculosis, pneumonia, SARS.
The other infectious diseases caused by viral pathogens include:

  • influenza
  • smallpox
  • mumps
  • measles
  • chickenpox
  • ebola
  • rubella
  • tetanus
  • typhoid fever
  • diphtheria
  • meningitis
  • anthrax
Coronavirus pathogen

Although many pathogenic microorganisms primarily spread through a direct contact, due to a very small size and weight they can easily become airborne when the infected person spreads the pathogens through breathing or respiratory droplets expelled from the mouth and nose while sneezing and coughing.

Size of Pathogens:

  • Bacteria 1 - 5 microns
  • Fungi 1 - 40 microns
  • Viruses 0.02 - 0.3 microns

Pathogen Remediation

While pathogens are constantly present in the air, their type and concentration can be especially dangerous for children, individuals who have chronic asthma or other respiratory impairments, or those with preexisting respiratory ailments such as COPD, bronchitis, emphysema.
Effective removal of airborne pathogens out of the air can help significantly reduce the occurrence of infectious diseases caused by pathogenic microbes, bacteria and viruses and for these groups of people may become a life saving requirement.

There are few ways to kill pathogens by subjecting them to:

  • Chemicals (antibiotics)
  • High temperature
  • Ultraviolet light
  • Mechanical air filtration
  • Plasma (Ionization)

Exposure to Chemicals (Medicine)

Antibiotics is the most common method of killing bacteria. The antibiotics work by destroying the bacteria cell wall. This leads to expulsion of pathogen's DNA, inability of pathogens to produce proteins and eventually death. The medication can be added into the air by using vaporisers or humidifiers with medicine cup. Unfortunately, the recent studies show the emergence and spreading of "superbugs" which develop high level of resistance to antibiotics, making them ineffective.

Exposure to High Temperature

Exposure to high temperature is one of the most common methods of killing pathogens. However, it is only applicable to killing pathogens attached to the surface of the objects required sterilization, and hence do nothing with the airborne pathogens.

Exposure to UV Light

The Ultraviolet (UV) light (Germicidal UV light especially) is the fastest and most effective way to sterilize the air from airborne pathogens. Germicidal UV bulb produces the ultraviolet (UVC) light with specific wavelength of 253.7 nm (nanometer). The exposure of pathogens to the UV light with this wavelength destroys the Thymine amino acid in pathogen's DNA, leading to pathogen's inability to produce protein and death.
The sterilization power of Germicidal UV light is about 1,600 times of a direct sunlight, and therefore is extremely lethal to most airborne pathogens - bacteria, microbes, viruses.

Mechanical Air Filtration

True HEPA filter has a guaranteed filtration efficiency of over 99.97% in trapping all solid sub-micron airborne particulates as small as down to 0.3 micron in size. This size range includes all airborne bacteria, microbes, fungi and larger size viruses. Trapped in the air purifier's True HEPA filter, pathogens are exposed to the constant air rush, which deprives them of moisture and eventually making them to die. 
The higher efficiency particle filters such as, 99.99% @ 0.3 micron efficiency Super HEPA or 99.999% @ 0.1 micron efficiency ULPA filters can be more effective in trapping of sub-micron viruses. However, tighter particulate filters may result in a reduced air flow and a number of air changes per hour (ACH), resulting in a lower overall performance due to a higher back pressure from a more dense filter media. Therefore, it is essential that the air filtration system of air purifiers for pathogens contains a large, perfectly sealed True HEPA filter.

Plasma Ionization

In the early 2000s SHARP corporation developed and patented an advanced air cleaning technology called Plasmacluster Ion (PCI).
This innovative technology replicates Nature's Own air cleaning process that purifies air in the Earth's atmosphere by producing the balanced shower of positive and negative ions from water vapors in the air.
The ions are dispersed throughout the entire room where they actively seek, attack and deactivate airborne pathogens: germs, bacteria, viruses, mold spores, fungi, etc.
The Sharp's Exclusive Plasmacluster Ion technology has clinically proven effective in significantly reducing the airborne pathogens such as:

Below the Plasmacluster Ion Performance Test Results on Pathogens.

Pathogen TypePathogensRate of Reduction
Staphylococcus Epidermis89.7%
Serratia Marsescens85.6%
Mold, FungusPenicillium Citrinum87.7%
Aspergillus Niger85.8%
VirusMS2 Viral Stimulant90.3%

Removal of Airborne Pathogens

In view of the above, the most efficient air purifiers for Airborne Pathogens Control should meet few requirements.

1. The air filtration system should include large and perfectly sealed particle filter: True HEPA, Super HEPA or ULPA.
While all air purifiers offered in this page are equipped with large True HEPA filters, two of them AirPura I600 and Amaircare 3000 employ the oversize True HEPA filter each containing a whopping 100 sq. ft. of medical grade True HEPA filter.

2. Germicidal UV bulb most likely is a single most effective option that can significantly boost the air purifier's ability to sterilize the air from airborne pathogens quickly and effectively.
AirPura UV600, AirPura P600AirPura P600 Plus air purifier models all are equipped with high-output Germicidal UV bulb, making them the strongest contenders in the category of the most efficient air purifiers for Airborne Pathogens Control.

3. Sharp FP-F50UW, Sharp FP-F60UWSharp KC-850U and Sharp KC-860U all are equipped with Sharp's exclusive proprietary Plasmacluster Ion generators, and therefore are strong contenders in the category of best air purifiers for Airborne Pathogens Control.

Recommended Air Purifiers for Pathogens

Home and Office Use under 700 sq. ft.

Home and Office Use under 2000 sq. ft.

Air Purifier ModelHEPA Filter, sq. ft.Sterilization mechanismAir Flow Rate, cfm
Airpura UV60040Germicidal UV Bulb560
Airpura P60040Germicidal UV Bulb560
Sharp KC-860U
20Plasmacluster Ion300
Sharp FP-F60UW17Plasmacluster Ion260

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