Internet of Things

Top 5 Things to Keep in Mind Before Buying an Air Purifier A basic buying guide for Air Purifiers


AIR POLLUTION is a rising concern for the past 5-years especially in the northern parts of India. One of the primary reasons for this is also the visible smog and high levels of air pollution.

Visible signs are obvious but do you know that even if there are no visual clues, it really does not mean that the air quality of a city or an area is good.

In a recent incident when the Supreme Court was hearing a matter related to air pollution in the National Capital Region, according to a PTI report, Justice Arun Mishra said “In the morning and evening, there is so much pollution and traffic congestion, It is better not to be in Delhi. I do not wish to settle in Delhi. It is difficult to live in Delhi.”

As humans all we can do to counter the effects of air pollution is to be cautious in minimising our carbon footprint. These best practices will take time to adopt and the air quality will also take time to improve. But keeping the health concerns in mind, one has a natural tendency to look towards technology as a solution.

The easiest way to ensure that you can at least breath the minimum amounts of pollutants present in the air around you is to have an Air Purifier. With so many options available in the market, here’s a quick guide to the things that one should keep in mind before buying an expensive air purifier. 

1. Coverage Area 
The size of your room or your house is an important factor when you are choosing an Air Purifier. Large areas and bigger rooms require larger and effective air purifiers. A room that is 20-40% larger than the air purifier’s coverage area is a good choice if you want optimum performance.

Also, people prefer to keep compact and silent air purifiers in the bedroom so that their sleep is undisturbed and on the other hand, larger air purifiers should be considered for the living area.

Also, a single air purifier is not good enough to cover your entire house, you will have to invest in multiple units depending on how big your house is. 

2. Clean Air Delivery Rate
Clean Air Delivery Rate or CADR lets you identify how quickly the air purifier can purify the air. It calculates how many cubic feet of air, the purifier can filter in one minute.

Higher the CADR number, better the air filtration. Air purifiers consist of three CADR numbers for dust, pollen and smoke. If you have a larger space, consider going for an air purifier that has a higher CADR rating. 

3. Air Quality Indicator
The Air Quality indicator display is an essential feature in an air purifier. The digital indicator and various coloured lights shows the pollution levels drop or go up in real time.

Air quality indicator on a Samsung Air Purifier
Air quality indicator on a Samsung Air Purifier. (Image: Samsung)

The purifier should also be equipped with sensors that give an exact numeric measurement of the PM2.5 (ultra-fine dust) and PM10 (fine dust) levels. This will give you an idea of how to variably change the speed of air purification on the device. 

4. Filter Life and Availability
This is one of the major pointers. Usually Air Purifiers work like big Vacuum Cleaners for the air around you. In depth research needs to be done about the type of filter used in an air purifier before getting one, there are plenty of companies out there (Especially the Chinese ones) that hardly mention what Air Filter is used in their product. The filter must be equipped to filter things like pollen, dust, smoke, odour, and other harmful pollutants. 

Air filter is the most important component of an Air Purifier
Air filter is the most important component of an Air Purifier. (Image: Samsung)

There are four types of filter available

a) HEPA (High Efficiency Particulate Air)

b) Charged media 

c) Antibacterial and germicidal

d) Electrostatic precipitator

The filters of the air purifier you intend to buy must be available in the market at the time of filter replacement, from time to time. The air filter cost should also be taken into consideration. Also, do not try to clean the air filter on your own and reuse it. The purpose that an Air Purifier solves is somewhat diluted when you do it. 

5. Warranty And Service
Lastly warranty and service are paramount in buying any technology device. Air Purifiers also come with a warranty. Users should also check all the terms and conditions of warranty offered along with an Air Purifier.

Also, the manufacturer needs to have a robust service network and brands like Samsung, Philips, Honeywell etc have a strong service network. And on the other hand there are plenty of online sellers selling Air Purifiers with no guarantee of a service network, if things go south to your air purifier investment. This means check for post-sale after service being offered by the company.




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