Air forced through a basic filter will trap large particles

Most store bought air purifiers feature filters with very little use.  Some dust and large particles will be trapped

Has almost no effect on general air quality.  Has no effect against odors, VOCs, biologicals, etc. 

Small areas, no more than a room

Zero effect 

Frequent filter replacements required.

Negative oxygen is produced using a variety of methods & quantities.

Has an effect on removing biologicals and VOCs. 

Has a tendency to stick together and become ineffective.  Unable to travel distances.  Not effective against odors or most particulates. 

Small areas, no more than a room

Possible, but not typically effective

Little to none

Ozone (O3) is produced in high quantities using a variety of methods

Effective method to neutralize odors, chemical gases, bacteria, mold, viruses, and more. 

Typically produce high concentrations of Ozone beyond safety standard limits.  Often requires evacuation of the room.  Can become irritating and leave an unpleasant odor.

Can remove contaminants in large areas or entire buildings.

Highly effective against viruses, bacteria, mold, and entrenched odors found on surfaces

Often requires costly and frequent bulb replacements.

UV light reacts with a metal TiO2 catalyst to produce hydroxyl radicals.

Effective at reducing bacteria, mold, viruses, and VOCs that come into contact with the catalyst surface (only air passing through its chamber)

Is only effective on the air that goes through the filter chamber. Does not remove particulate matter. Risk of incomplete oxidation. Requires slow airflow rates.  Use of LED bulbs extends system life, but decreases effectiveness. 

Can cover larger areas than HEPA, but typically no more than a room. HVAC installations are possible. 

Zero effect 

Costly and frequent bulb replacements required unless LED bulbs are used.

Air forced through a true HEPA filter will trap particles, but has the most trouble with 0.3 microns (the MPPS)

Effective and proven method to reduce allergens, dust, and other particulate matter including PM 2.5.  Can be placed in the HVAC system as well.

Is only effective on the air that goes through the filter chamber.  Does not remove contaminants like odors and chemical gases. Fan speeds required to be effective with dense filters typically are noisy. 

Can remove particulates quickly, but only in small areas.  HVAC installations are possible. 

Zero effect 

Costly and frequent filter replacements required.

Chemical gasses and odors present in air forced through a carbon filter will be absorbed by the carbon and removed.

Effective and proven method to remove chemical gasses and heavy odors from the air.  Can be placed in the HVAC system as well.

Is only effective on the air that goes through the filter chamber.  Does not affect particulates or biologicals. Fan speeds required to be effective with dense filters typically are noisy. 

Can remove odors quickly, but only in small areas. HVAC installations are possible. 

Zero effect 

Costly and frequent filter replacements required.

Ultraviolet germicidal irradiation (UVGI) is a disinfection method that uses short-wavelength ultraviolet (UV-C) light 

Kills or inactivates microorganisms like bacteria, mold, and viruses.

Is only effective at short distances with direct line of sight (100% power at 1”, 25% power at just 2”, etc.).  As it is unsafe for direct human exposure for prolonged periods, it must be contained in a filter chamber or the room must be evacuated.  Requires slow airflow rates.  

Coverage is limited to the airflow of the system they are installed in.  HVAC installations are possible. 

Effects any surface the light shines on in close proximity. 

Costly and frequent bulb replacements required.

UV light reacts with a 5 nano metal catalyst (AHPCO) producing a variety of catalytic molecules. 

Effective and proven method to reduce odors, allergens, bacteria, mold, viruses, and VOCs. Does not require air to pass through its chamber in order to be effective. Removes PCO related concerns of incomplete oxidation and slow airflow rates.

Is less effective against particulate pollution than HEPA or polarized ionization.  Initially takes longer than carbon filters to effect odors, but after continued use in a space is indistinguishably effective in most cases when new odors are introduced.

Can remove contaminants in large areas or entire buildings. HVAC installations are possible. 

Highly effective against viruses, bacteria, mold, and entrenched odors found on surfaces

Long Life bulb coating reduces replacement frequency of UV bulbs. 1-2 years depending on unit.

Carbon brush nodes split water vapor in the ambient air into Polarized ions which are proactively dispersed. 

Effective and proven method to reduce allergens, dust, PM 2.5, bacteria, mold, viruses, static, and VOCs. Does not require air to pass through its chamber in order to be effective. Removes concern of incomplete oxidation and slow airflow rates.

While effective over time, it is less powerful against heavy VOCs and Odors than AHPCO or Carbon filtration. 

Can remove contaminants in large areas or entire buildings. HVAC installations are possible. 

Highly effective against viruses, bacteria, and mold found on surfaces.

Zero replacement parts for life.  Nodes should be gently dusted with a flick of the finger every few months.