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All About Air Purifiers in India

Every Question About Air Purifiers in India, Answered

Air Puriifer
Air Purifier cleanse the air. Image Credits Aries329 via Pixabay

Air purifiers have become increasingly important given the ever rising pollution levels in India. High PM2.5 and CO2 levels can threaten health both outside and inside the house.

It is a good idea to purchase an air purifier in India for your home to create a clean indoor breathing environment for your family and to minimize allergens in the air to help fight allergies.

In this blog post we have complied all the questions you could possibly think of before buying the best air purifier in India.

We talked to real air purifier users and to experts and asked their opinion so that you can make a smart and informed buying decision.

Air Purifier FAQs

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What is an Air Purifier?

Air purifiers filter particulate matter and odors. Image Credits Giphy

An air purifier is device which cleanses the indoor air of its contaminants or impurities to provide clean home atmosphere. The impurities removed include dust, pollen, CO2, smoke and mold spores.

In short it is a device that sucks in contaminated air, filters it and releases clean air.

It is most beneficial for those suffering from allergies and asthma.

What are the different types of air purifiers? How do they Work?

1. HEPA(High Efficiency Particulate Air) Technology

HEPA filter in air puriifer cleans the air
HEPA Filter in action. Image credits

HEPA filters need to meet a standard- they must trap at least 99.97 % of all particles larger than 0.3 microns. Since this filter can trap chemicals, bacteria and molds it cleans the air.

HEPA filters however are not capable of removing odour or gases and are used along with activated carbon filters. They last for about 2-4 years and produce no harmful byproducts.


2. ULPA (Ultra-low particulate air) Filters

ULPA filters are more efficient than HEPA filters. While HEPA filters are 99.99% efficient with particles 0.3 microns and larger in diameter,  ULPA filters are rated 99.999%  efficient with particles 0.12 microns in diameter.

ULPA filters are used to reduce the particulate levels in indoor air and prevent the spread of bacteria and germs. Hence, they filter the air while minimizing the threat of infectious diseases, in air filtration and purification systems to control airborne particulate levels and to stop the
spread of toxic agents and infectious diseases.

3. Ionizing Purifiers

Ionizing Purifiers release electrons in the air. These charged particles attract dust, pollen and cigarette smoke to form larger particles that are easily trapped by the filters of the air purifier. An improvement to this is the Plasmacluster technology available in Sharp Air Purifiers in which water vapor present in the air is broken by a pair of electrodes into positive and negative ions. These ions form a cluster with water vapor and are dissipated around the room due to the air flow of the device.When these clusters come in contact with pathogens the hydroxyl ion (OH) reacts with the proteins in the pathogen oxidizing them and thus rendering them harmless. This cluster also reacts with chemicals in the air neutralizing them.

4. Adsorbtion technology

Adsorbtion is a process of adhesion of atoms, ions and molecules to the surface of materials. In simple words certain substances attract and trap odor causing gases on their surface and are used as in air purifier to remove smells from the room. Filters based on adsorbtion technology can be of several types.

Activated carbon filters

Activated carbon is material with a large surface area which adsorbs impurities like gases and odor causing chemicals. It is particularly beneficial for people suffering from MCS (Multiple Chemical Sensitivity). It is used along with HEPA filters.

Zeolite filters

HiSiv is an advanced technology patented by Honeywell. This technology has been used commercially for drying and purifying liquids and gases by passing them through molecular sieves made of hydrated aluminosilicates and is now available in Honeywell Air Touch air purifiers. The zeolites in a special honeycombed filter adsorb odor causing gases and impurities in the air.


5. UV Light

UV Light Air Purifier
UV Light kills germs. Image Credits Erik S via

Ultraviolet Light is used to render harmful germs such as bacteria and fungi sterile. It does not eliminate airborne particles and hence it is used along with HEPA and Activated Carbon Filters.

We talked to actual air purifier users to find out their personal experience and opinion on air purifiers that they have been using. We asked them common questions about air purifiers so that you can make an informed buying decision.

Here are the people that we talked to

Mr Anil Gadi, Director at Shriram Piston & Rings who lives in Gurgaon is a satisfied user of Honeywell Air Purifiers. He told us that he bought one because in his opinion it is good for the health of his kids and they deserve to live in a pure atmosphere.

“People ask me why I have bought an air purifier when I cannot control the air quality that my kids breath when they are not at home? I think this logic is convoluted. I mean look at this the other way. If I can ensure that my kids can at get pure air at least 8 hours a day I think this is better than no freask air at all.”

Mr. Aditya Vikas Agarwal has been using H3o Air Purifier for the past 2 years. When we asked him why he bought it, he said.

“I bought it 2 years back when demand was still slow but I bought it instantly after I got to know how bad air quality can negatively affect your health and reduce life span. It is surly a must if you can afford it. I have done a lot of research and H3O healthcare purifiers are the best in terms of filtration technology and features.”

Mrs. Vishakha Rao has been a consistent user of Daikin Air purifiers. She says,

“I bought it due to the increasing pollution especially since last two Diwalis”

Mr. Jai Dhar Gupta is the owner of Nirvana Being. He has been using Airgle Air Purifiers since 2013, a product that his company sells in India. This is what he had to say when we asked him the reason for purchasing an air purifier.

“It started in November 2013 when I started having trouble breathing. Soon the wheezing turned into chronic lung ailment and reduced lung function. That’s when I realized the importance of an air purifier in my home. I am extremely scientific and with high-end particle count machines, I tested many air purifiers, but the Airgle PurePal Clean Room air purifier is the only one that got the job done and gave me peace of mind.  I strongly recommend others to buy this air purifier simply because it really does what it claims. The cHEPA technology found in the Airgle combined with the Titanium Pro module filters 40 times more than the ordinary purifiers present in the market.”

It is more expensive, but frankly, we all know that you get what you pay for.”

Mr Sudhir Pillai is General Manager, Homes at Honeywell Home & Building Technologies, India. He shared his expert opinions on air purifiers in India.

According to Mr Pillai, one should definitely buy an air purifier. He told us

“The primary reason [to buy an air purifier] is that the indoor air can be up to 10 times more polluted than outside air. While most people understand that the air outside is harmful due to visible pollution, many don’t realize how deadly the inside air is. We spend the maximum amount of our time indoors – at home, in a car, inside a public building and at a workplace. Pollutants and allergens such as residues, fungal spores, cleaning agents, cooking smoke, paint fumes, varnishes, pet dander and accumulated dust can make your indoor air even more deadly than outdoor pollution. As such it has now become imperative to have an air purifier to help fight the problem of indoor air pollution. Many of the pollutants inside the house trigger allergies and asthma, therefore an air purifier will help provide the relief and will reduce the possibility of getting infected by clearing out these pollutants.”

Mr. Shuvendu Mazumdar is the Head Of Operations at Sharp Air Purification Division. He has provided his valuable expert opinion on all the questions that you might come up with when planning to purchase an air purifier.

Read here to know more about Sharp Air Purifiers

Are they worth it? / Do they really work?

Yes! They really work. All the people we talked to gave a thumbs up to air purifiers.

This is what they had to say.

Mr Anil Gadi is very happy with the two Honeywell Air Purifiers that he owns, he said

“While the device is working the effect is quite imperceptible except during days when the air quality is really bad. However, when you open the unit to replace the filters, you will be surprised to find the amount of dust and dirt that are stuck on the filters. It is then that you realize that they really do work and also do a great job at cleaning the air. Looking at all that muck you feel fortunate that you are using an air purifier, because if you did not have that device all that dirt would have ended up in your lungs”


Mr. Aditya Vikas Agarwal says,

“Air purifiers are a little expensive but I believe that they are definitely worth it!”


Mrs. Vishakha Rao says,

“Air purifiers really work. I am satisfied.”


Mr. Jai Dhar Gupta says,

“Yes, the Airgle PurePal Clean Room air purifier is an Ultra Low Penetration Air(ULPA) filter. An
ULPA filter can remove from the air at least 99.999% of PM2.5, dust, pollen, mold, bacteria and any
airborne particles with a size of 100 nanometres (0.1 µm) or larger. It is clearly the Rolls Royce of
air purification.”


Mr. Shuvendu Mazumdar says,

“Unlike food and water where the quality of the consumption can be chosen by us, our consumption of air is entirely dependent on the surroundings. Hence if someone sneezes near you, you are exposed to poor quality air. Thus, a lot of harmful substances enter our lung through the airway. The intensity and the type of pollutant depend on the surroundings that one is exposed to. If you think about it, you will realize that we are exposed to a variety of pollutants wherever we go. Be in school, office, mall, public space or even our bedroom has so many kinds of pollutants which are not in our experience. Using an air purifier or for that matter staying in a purified environment for 8 to 10 hours will lead to a lesser exposure to pollutants thus reducing the volume/ intensity of pollutants entering the body. Lesser pollutants mean lesser sick days.

 The right air purifier is the one which can take care of a large variety of indoor pollutants”

How long does it take to clean a room?

See what the users have to say about it:

Mr Anil Gadi said

“That is a difficult question to answer. In my opinion in an area of 300 to 500 sq ft with doors being opened occasionally it takes an hour to feel the difference.” 


Mr. Aditya Vikas Agarwal says,

“It takes about 15 minutes to get the PM2.5 level to the safe level ie between 0 to 50. I have the H3O healthcare VE2 which has a build in aerosense meter to accurately sense the PM2.5 level in the room”


Mrs. Vishakha Rao says,

“It takes around 10 minutes to clean the room. I keep it on the entire night.”


Mr. Jai Dhar Gupta says,

“It’s a continuous process which means that in an hour, 5-6 times the entire volume of air in the room needs to pass through the filters for the air purifier to be effective. However, working of an air purifier depends on various factors like room size, gathering (no. of people sitting in a room), activities (smoking, cooking, eating), etc. Our tests have shown that the Airgle improves the air quality by 90% within the first hour of operation and will lower levels by 99% thereafter.”


Mr. Shuvendu Mazumdar says,

“As mentioned in the last section, there are variety of pollutants indoor, for example PM2.5, microbes, allergens, gaseous substances (TVOC, HCHO), smoke, static electricity etc. Each of these harmful substances require different time periods to clean. Clean Air Delivery Rate defines the speed at which the purifier can clean any particular space. But this is limited to dust, smoke & pollen. For microbes, gaseous substances etc there are no standards.

 Say for example, our Air Purifier model [sharp] FP-F30E-H when used in a 120 sq ft room can clean the air 5 times in one hour with a CADR of 180m3/Hr. “


Mr Sudhir Pillai said

“Depending on the room size, CADR (Clean air delivery rate), number of air changes per hour and mode of operation it should take somewhere between 20 minutes to 1 hour to clean the air in a room.”

Where should it be placed?

Air Purifier in India Living Room
Image Credits

You should place the air purifier at that part of the house where you spend most of your time in. If you family spends most of their time in the Living room place it there. Bedroom is another good place to place the air purifier in.

Keeping it switched on at night will surely help you sleep better. 


Mr. Aditya Vikas Agarwal says,

“They should be placed in your bedroom for sure cause you sleep there and that’s the time you should surly be sleeping in pure air. I have them in my living room, bedroom and office as well cause I believe bad air quality is a slow killer which reduces like span by atleast 5 years.”

Mrs. Vishakha Rao says,

“I have one in each bedroom so that at night we breathe clean air.”


Mr. Jai Dhar Gupta says,

“I placed mine beside the corner wall facing the front door. It helps the air purifier in circulating even flow of the air across the room. Please keep in mind that there should be at least 1ft. gap from the wall.”


Mr. Shuvendu Mazumdar says,

“As mentioned in the first section, the fundamental purpose of an air purifier is to reduce our exposure to various pollutants. Hence it is evident that it must be used in an area where we spend the maximum duration of time and at a stretch. Bedroom or office space are such areas where use of air purifiers can be helpful. When used in a bedroom, it should be placed at an area where it can contribute to the airflow of the room and visible from each corners. They typically work on line of sight. The flow and suction of air is important.”


Mr Sudhir Pillai said

“To ensure optimum circulation of pure air inside your room, keep the purifier 30 cm away from the wall. Honeywell Air Purifiers release air at an angle of 15°-20° to create optimum air flow inside your room to clean air even from the farthest corners.”

How much electricity does an air purifier consume?

a plug in a socket
Image Credits maxpixel via

The amount of electricity an air purifier consumes falls in the range 40-200 W. Assuming the Per Unit Cost of Electricity is ₹6 and the air purifier stays on for 8 hours this is how your electricity cost of air purifier will look like:

Power Consumption of Air Purifier Daily Bill Monthly Bill Yearly Bill
40 W  ₹1.92  ₹58.44  ₹701.28
160 W  ₹5.76  ₹175.32  ₹2103.84
200 W  ₹9.6  ₹292.2  ₹3506.4

You can calculate the electricity cost for your air purifier Here.


Mr. Aditya Vikas Agarwal says,

“In terms of electricity H3O healthcare VE2 hardly takes any mine consumes 40 W per hour which is as much as a bulb so very energy efficient”


Mr. Jai Dhar Gupta says,

“The Airgle Air Purifier comes with energy star certification. The power consumption depends on the fan speed. For example; it will consume 49W on number 1, 66W on number 2, 84W on number 3, 102W on number 4, and 192W on number 5.”


Mr. Shuvendu Mazumdar says,

“In case of Sharp Air Purifier, the electricity consumption is negligible. The maximum in our case is 75 watt for a 650 sq ft air purifier.”


Mr Sudhir Pillai told us

“Air purifiers are extremely energy efficient, equivalent to 1 CFL to 3 CFL bulbs based on the mode of operation.”

What is the running cost of an air purifier?

Electricity consumption is only a fraction of the running cost of an air purifier. The real expense is the cost of replaceable filters.

Mr Anil Gadi has been using his two Honeywell air purifiers for the past 3 years and gave us an idea of the filter replacement costs.

“The bigger air purifier filter costs ₹8000 and has to be changed every 7 months, the filter of the smaller one costs ₹5000 and has to be changed every 8 months. So on an average the bigger air purifier costs around ₹13,000 a year and the smaller one costs  ₹7500 per year. I think that is a small cost to pay for a healthy life.” 

 Pros and Cons of Air Purifiers

Image Credits

An Air Purifier definitely has a lot of benefits for your family and home but it may or may not have disadvantages. Regular users would be better aware of certain disadvantages if any, of the air purifier they have been using. Knowing the benefits and disadvantages will help you correctly know what to expect from your Air Purifier and which air purifier to buy.


Mr. Aditya Vikas Agarwal says,

” I don’t catch common cold and cough now it’s been 2 years I feel more energetic I the morning I don’t get hangovers.

The downside is that they are a little expensive”


Mrs. Vishakha Rao says,

“It’s really effective. Physiologically I feel the freshness.”

“One thing that I do not like is that it’s tedious to change the filter every month. If the filter was like those in an AC, it would have been easier to clean and dry.”


Mr. Jai Dhar Gupta says,

“I have used many machines in the past, and nothing matches with the results I get with the Airgle.  The other machines are frankly toys in comparison – they were built for markets like London, Paris and Singapore where the worst days will see PM2.5 levels of 180-200.  In India, our good days range between 15-200 and our really bad days are over 1000.  Keep in mind the World Health Organisation(WHO) safe level for PM2.5 is 25.

The Airgle being an ULPA machine, is the only one I have come across that works to bring the levels into the safe zone in Urban India when the levels cross 300 – which happens on over 100 days of the year, in Delhi.”

“I think one has to be careful while buying an Air it is important to verify the efficiency of the air purifier through certificates or actual demonstrations.”


Mr. Shuvendu Mazumdar says,

“Pros of Sharp Air Purifiers: Plasmacluster MIMICS Nature, no harmful Ozone in purification process. Safest Air Purification technology. Combines ACTIVE & PASSIVE Purification for holistic performance. Highest Grade of True HEPA (H14 grade) used. Commitment to provide service and consumables for a period of 5 years from discontinuation. Wide variety of pollutants eliminated. Verified by 28 Global Labs. Over 7 crore users worldwide. The highest sold Air Purifier in India. The only air purifier which can improve skin texture and eliminate static electricity.

 Cons: Not a very popular brand in India.”

We hope this blog answers all the questions you can possibly come up with while purchasing an air purifier in India. If you come up  with any other query that need to be answered feel free to leave a comment, so that we can contact users and experts and answer the question next time we update this blog.

Last updated: 9 August 2017

About Akshita Sharma

Akshita is an economics student currently studying at Delhi University.


  1. Hey Akshita, lovely article. I need your contact info please share, kinda urgent.

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