5 Common Types of Air Purifiers and Difference

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5 Common Types of air purifiers

Air purifiers have always been the topic of discussion among the people. Some of us can’t stop praising these products designed to trap and kill the airborne pollutants. These pollutants possess the potential to destroy our health by attacking the body’s defense system. So, dealing with them is a matter of great importance. So, if your mind has been made about buying an air purifier, you must be well aware of different types of air purifiers and their features and benefits.

Air Purifiers- Breathe in pure, fresh air

All of us are very careful about what goes in our stomach. The food and beverages that we consume, we are always careful about their quality because we never want bacteria or harmful particles to enter our bodies and make us sick. Like food and water, air is essential for us to survive. Since it is essential, it’s quality is one of the main concerns in today’s world where harmful substances are introduced into the atmosphere every day.

Breathing in fresh air is a major necessity for living a healthy life. Many people when leaving their houses are seen grumbling about the polluted environment. But outdoor pollution isn’t the only issue we are facing today. The indoor air quality is just as important as outdoor, if not more.

Most of us spend a great part of our day indoors either in houses, offices, schools, diners, cafes etc. So, it’s necessary that the air filling the buildings in which we live, work, study or eat is free from all kinds of contaminants that can affect our health adversely. Air purifiers aid us in the task of making the atmosphere inside our homes pollutant free. There are many types of air purifier and each one possesses certain features that contribute to clean the air.

Types of Air Purifiers:

Air Purifiers, the air cleansing devices, comes in all sorts of shapes, sizes and are accompanied with different features that make it easy to clean the air filling our houses. The allergens like dust mites, pet dander, pollen and other problem causing harmful substances are eliminated from your homes through their use. Some products will focus on special context such as air purifier for pets odors, allergies, smoke,..or even combination between air purifier and humidifier

One must know that all the air purifiers do not employ the same technology. On the basis of technologies, air purifiers are classified in five different categories.

1. HEPA Air Purifier

Air Purifiers employing HEPA technology are most common these days. HEPA stands for High-Efficiency Particulate Air. A HEPA filter isn’t extremely complex. These not so complex filters in air purifiers are capable of capturing 99.97% of all the airborne particles that are larger than 0.3 microns for example pollen, pet dander, dust mites, mold spores, and tobacco smoke etc.

How does it work?

HEPA air purifier

HEPA air purifier via wiki

When do comparison between Hepa and ionizer air purifier, HEPA filter consists of layers and layers of fibers constructing the web to trap the pollutants. When the polluted air filling your homes passes through the filter, large particles are captured instantly because they won’t be able to pass through the openings. The air is freed from the small particles by one of the following mechanisms.

  • Interception: Pollen, pet dander, mold spores etc stick to the fibers while trying to pass through the filter.
  • Impaction: Medium-sized particles collide with the fibers. As a result, they get attached to the fibers.
  • Diffusion: The allergens with the smallest size collide with the gas molecules because of which their velocity is decreased. Afterward, they are trapped by one of the above-mentioned mechanisms


There is one setback of using HEPA air purifiers. Capturing odors, smoke and chemicals isn’t the job they can perform well.

2. Activated Carbon Air Purifier

Like HEPA, activated carbon is another known type of air purifier designed to tackle the issue of unpleasant odors. They are capable of effectively trapping the pollutants like gasses, chemical emissions, tobacco smoke, perfumes and chemicals in household cleaning items. People having Multiple Chemical Sensitivity are benefited from such air purifiers too because these air purifiers also absorb formaldehyde.

How does it work?

Activated Carbon Air Purifier

Activated Carbon Air Purifier with many pores

In this air purifier, the filter has many pores that have the ability to absorb and chemically bond with the contaminants. Once the chemicals, tobacco smoke or any other substances are trapped in the pores, they aren’t released into the air hence, eliminating the risk of recontamination.


People intending to purchase an activated carbon air purifier should know that they have certain limitations when it comes to removing contaminants that are far away and they aren’t very efficient in removing the allergens and other airborne pollutants.

3. UV Air Purifier

UV technology makes use of ultraviolet light that has the property of inactivating viruses, mold, and bacteria by attacking their DNA or RNA and consequently breaking it down. They improve the air quality by removing detrimental substances. Instead of trapping the particles, UV air purifiers’ filters kill them.

How does it work?

sanuvox UV air purifier

sanuvox UV air purifier via cutcat

In a UV air purifier, a UV lamp is installed whose rays cause cellular or genetic damage to microorganisms as they pass by the lamp. This cause destruction of microorganisms. The oxygen and water molecules are converted into ozone and hydroxyl by the air purifier. These converted molecules then react to the pollutants swirling through the air and turn them into compounds that are harmless like water and carbon dioxide.


For trapping the airborne particles, UV technology is useless. That is why it’s better to use it in conjunction with a HEPA or activated carbon filter system.

4. Negative Ion Air Purifier

The next in the list of types of air purifiers is negative ion air purifier. A negative ion air purifier makes use of negative ions to take care of the irritants in the air that affects our health. A negative ion is a negatively charged particle that is created after an atom or a compound gains an electron.

How does it work?

Negative Ion Air Purifier

Negative Ion Air Purifier

This air purifier generates negative ions that magnetically attract the molecules of pollutants such as pollen, dander, and dust. The airborne particles become too heavy to remain in the air and drop down on different surfaces inside the room.


Negative ion air purifiers do not eliminate the particles from your surroundings. The harmful particles that fall down on different surfaces in the room can become loose and recontaminate the air. These air purifiers merely mask the polluted air instead of cleansing it.

5. Ozone Air Purifier

The unstable molecule of oxygen O3 that oxidizes everything it comes in contact with is defined as ozone. Ozone air purifiers are designed to generate ozone intentionally into the air. For removing odors, this type of air purifier proves to be very effective.

How does it work?

The highly reactive molecules of ozone freely circulate in the air. When these O3 molecules spot a pollutant, a single atom from ozone molecule breaks away from the other two atoms and bonds with the pollutant molecule rendering it harmless.


Ozone air purifiers emanating ozone gas are harmful to human health as well as your pets. Even if there is a low amount of ozone in the air, chest pain, shortness of breath and coughing is caused. Long exposure to ozone can permanently damage the lungs and also worsens chronic respiratory diseases.


Air purifiers are the appliances aiding us in removing the contaminants from the air. These products are useful for people suffering from asthma and allergies because they are great at trapping or killing the allergy triggers. When it comes to purchasing an air purifier, many choices are available to you. But you should only choose the type of air purifier that best suits your needs.

About the Author

Hello Friends, My name is Minnie Scott, the founder of CoolDehumidifier.com and I would like to take the opportunity to welcome you to our site. This site will let you know the absolute information about different aspects of various brands in terms everyone gets the right point. The information brought to your view here will help you make the correct decision before you hit the “buy” button.