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Which Is A Good Air Purifier For Home Use?

An average adult takes in 11,000 litres of air in a day, out of which around 6000 is during sleep. Using an air purifier can limit the damage to a great extent. What to look for in an Air Purifier?

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Startling Facts about Air Quality

Delhi and surrounding areas have been news with regards to air quality. So how bad is it really?

To get an idea about the air quality one of the best ways is to use or use the app Airvisual if you don’t have an air quality metering device. For example today’s air quality in Delhi is 352 which is 7 times above the breathable clean limit. PM 2.5 is 188.   Now here is the real shocker, PM 2.5  can be almost double to almost 2.5 times higher inside the house than the air quality outside.  Which means PM 2.5 is in the range of 350 to 400 inside the house. In air quality terminology this quality of air is termed as hazardous. On  Diwali night PM 2.5 crossed 999 (the air quality meter doesn’t measure beyond that no.)  

Remember in terms of controlling the damage caused by air quality on really polluted days there is nothing available as of now that can totally control it. Air Purifiers is one the best available solutions in terms of gadgets and technology to “limit the damage”. For example if PM 2.5 is 550, don’t expect it to drop 50 simply if you use the air purifier. Even with multiple air purifiers in the same room it can at best drop down to 80-100 levels, which is atleast better than hazardous.  On a “good” day in Delhi winter when PM 2.5 is around 180 at night, using an air purifier can take it under the 50 levels.  

An average adult takes in 11,000 litres of air in a day,  out of which around 6000 is during sleep. Using an air purifier can limit the damage to a great extent.

What to look for in an Air Purifier?

  • CADR - Clean air Delivery Rate

  • Type of Filter - The most effective is HEPA filter 

  • Change frequency - Look at the costs involved 

  • Ionizer - It  helps bring the 2.5 down

  • Power consumption 

Looking at few models of Air Purifiers in 14000 to 25000 range 

BlueAir - Joy S

Joy S is a good looking compact device that is good enough for a room of around 170 square feet.  An entry level device of Blueair, it is priced at Rs.14,999. However on the downside there is no display nor any other way to know if the room has been purified.  

Technical specs

  • Coverage area: 172 square feet / 16 square metres, suitable for small rooms

  • Clean Air Delivery Rate (CADR): 200 m3/hour, CADR indicates the volume of purified air (in cubic metres) which an air purifier produces every hour

  • Unique HEPASilent Technology combines electrostatic and mechanical filtration which removes 99.97% of air borne pollutants, bacteria, virus, allergens, microplastics, smoke, dust, pet dander and pollen smallest as 0.1 micron in size

  • 5ACH (Air changes per hour) -  Cleans air every 12 mins in the recommended room size

  •  Energy efficient only consumes 1.5 watt if used on normal fan settings, maximum energy consumption goes up to 10 watts on 3rd fan setting

  • Whisper silent performance

  • Long lasting Filter up to 4380 hrs, if used 24X7

  • Easy operation via one button control, Filter change alert & one can change the filter via simple twist

What’s Great


The design is compact and looks good


It works well in small rooms. It took around 30 - 45 minutes for a room of around 170 sq ft to be purified. Sound wise it’s pretty silent.

What’s Not Great

No Display 

Especially in relation to Indian extreme air conditions how is one to supposed to know if the air purifier is even effective?  This is one common problem which most consumers face. Buying an additional measuring device costs around 9000

Panasonic F- PXM35AAD

F- PXM35AAD is a compact device that is equipped with Nanoe technology, which according to Panasonic enhances the quality of indoor air by filtering out harmful particles including PM2.5. The device has a night mode which works really well in terms of less sound. Priced at 21,995, it is available on amazon for 13,939.00

Technical specs

  • Coverage area: 283 sq. ft. / 26 sq. mtrs., suitable for bedroom / living room (medium)

  • Purification method - High-Efficiency Particulate Arrestant (HEPA) filter type, H.E.P.A filter and deodorization filter

  • Warranty: 1 year on product and 3 years filter life

  • Filter replacement indicator

  • PM 2.5 certified

  • Wattage: 9 watts

What’s Great

Filter life

3 years filter life is great.


In terms of performance it’s pretty effective. It took around 30 minutes for a room of around 200 sq ft to come down from 300 to 70.  The night mode is almost silent. For an air purifier with a coverage area of 280 sq ft Panasonic F- PXM35AAD is pretty compact.

What’s Not Great

No Display

How is one supposed to know the effectiveness? For a product costing almost 22000 at least a basic display should be there.

Kent Alps Plus

Kent Alps Plus is good enough for 437 square feet.  It comes with an air quality display. It also has an ionizer. In terms of noise Kent Alps is low at 20 decibels and  minus the indicator light performs really well at night. Priced at Rs.25,000

What’s Great


Kent Alps Plus performs well in bringing down the pollution levels. The best it got was to bring down the 2.5 content in the air from 600 to 80 in around 15 minutes. That’s quite a performance truly. 

It has HEPA filter of grade 17 and combined with the ionizer it performs well. 


The ionizer works really well bringing down the 2.5 levels.  


There is an air quality display which is really useful. However the display may not be 100% accurate as its located in the device but at least it does a good job as an indicative effectiveness of the air purifier

What’s not good

No Night mode

There is no night mode. At best you can put the speed control on auto or low. Plus no way to control the LED indicator light at night. 

Disclaimer: The views expressed in the article above are those of the authors' and do not necessarily represent or reflect the views of this publishing house. Unless otherwise noted, the author is writing in his/her personal capacity. They are not intended and should not be thought to represent official ideas, attitudes, or policies of any agency or institution.

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Puneet Mehrotra

Puneet Mehrotra is an author and columnist who loves inspiring people and writes on business and technolog

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