Mi Air Purifier 2 – Review

Air Purifiers, may be a new line of products. The need for such a product at our home or office is something that depends on a calculated decision. If you are living in an area polluted by smog, pollen or dust particles, then you may need to buy an air purifier. They have been conceptually featured in household appliances like air conditioners, air coolers, etc. Buying an air purifier is trickier than usual, because the effects / effectiveness of an air purifier cannot be visually seen. It cannot be realized in a short span of time. Xiaomi has a solution and it is the Mi Air Purifier. 

Till date, Xiaomi has about 10 Smart home products in the international market. The Mi Air purifier was launched in 2014 and in 2015, the Air Purifier 2 was launched. Air Purifier 2 is a smaller and compact version of the Mi Air Purifier. This smart home product give you real time measure of air quality. It continually monitors the air for PM2.5, which is a primary measure of Air Quality Index (AQI). It filters the find particles in the air.

Fine particulate matter (PM2.5) is an air pollutant that is a concern for people’s health when levels in air are high. PM2.5are tiny particles in the air that reduce visibility and cause the air to appear hazy when levels are elevated.

The Mi Air Purifier 2 is a residential appliance that can sit quietly in a corner of your bedroom or living room and clean the air for you.

Why do you need an Air Purifier?

The Air Quality Index is a measure of pollution level in the air. PM2.5 is a primary constituent of the AQI. In India, most of the major cities are measuring alarming levels of pollution. Pollution is not just a problem while on road, but it is also a problem indoors. Smog may be visible to you outdoors, but PM2.5 can get into your home as well, without being noticed. On a long run, polluted air can cause you a host of respiratory health issues.

Check out this article on The Hindu, highlighting the air quality across multiple cities in India. You can also check the AQI in your city on AQICN website. This website feeds information from the monitoring stations placed in multiple places across your city. This will give you a rough idea. This may not be accurate in your place of stay or work. I just figured out that in the last 48 hours, the PM2.5 value in Bangalore has been as high as 201.

PM2.5 in Bangalore

There are many industrial monitors available in the market to measure the AQI. But the underlying fact is that, the air around you is polluted, though you may not visibly see it. A solution like Air Purifier, is a temporary relief in this chronic pollution plague that has affected our cities.

Mi Air Purifier 2

Now that we have established the need for an air purifier, let us talk about the Mi Air Purifier 2. As mentioned earlier, it is a Smart home product. The Mi Air Purifier 2 comes in a classic Xiaomi packaging with very simple and eco-friendly package. You would find the Mi Air Purifier 2, filter, cable and manual inside the box. The Mi Air Purifier 2 has an ultra minimal design. The design does not scream attention and it can quietly sit in a corner of your home and purify the air silently.


The material used is of good quality plastic. It is available in only in white color with matte finish. The inlet grills are on three side and the perforations have nice gradation to it. The fan pushes the air out from the top and the air is sucked in from the perforated grills. This forms a vortex of air stream pushing in the polluted air and pushing out the purified air. The fan is visible from top, and it is protected by a grill. The fan grill is designed to be kid safe.


The main control button is on the top. Long pressing it will power on or off the device. Short presses will toggle between the three different modes. At the back is a removable panel which will reveal the HEPA filter when opened. Above the panel is a cover hiding the sensor and above it is another button to control the brightness of the LED indicators. This button is also a reset button for resetting the filter life count after your change it, and also to reset the wifi setting, incase you need to.

The LED light on the front is also an indicator of air quality. If green, the air is good, amber is not good and red is highly polluted.

HEPA Filter

The filter has a life of about 4-6 months. The life depends on the air quality. It would cost Rs 2499 to replace a HEPA filter. The outer layer of the filter is made of polyether material. It filters out visible particles like dust, wool or pet hair. The second layer in the middle can filter out small particles of size 0.1 microns. The inner most layer is made of high quality activated carbon to absorb odors and harmful chemicals like formaldehyde, toluene, and other gaseous contaminants.


The HEPA filter is made by a Japanese company Torey and it is of high quality. Replacing the filter is very simple and it does not require any sort of assistance.



Setting up the Mi Air Purifier 2 is a very simple and straight forward process. Just remove the Purifier from the box and plug it in. It will start operating and does not require any special configurations. You can continue using it without having to connect to mobile application. But the mobile application gives you added convenience. Download the Mi Home application from the Google Play store and follow the steps below.


  • Login with your Xiaomi ID
  • The app will search for Smart Home applications on the network and show you the purifier. Select it.
  • Configure WiFi settings and connect the app to your WiFi setup. This will enable the purifier to connect to internet.
  • Now the app will create a short cut in the home-screen for you to access the Mi Air Purifier.

That’s it, you are done. Make sure you don’t place the purifier very close to the wall. A min of 1 feet distance is recommended to create a circulatory vortex. As long as it is connected to the main power supply and you have the internet on, you can access the Mi Air Purifier 2 from anywhere in the world.


As I mentioned earlier, the performance of the Air Purifier cannot be visibly realized in a short span. Every air quality monitor out there gives you a different value and there is not set standard to measure it. But to get a feel of the Air Purifier 2’s effectiveness, I smoked the room by burning a bunch of things including plastic, paper, Styrofoam and incense sticks. The Mi Home app showed me a maximum Pm 2.5 reading as 600. Even if the PM 2.5 is beyond 600, the sensor will not show anything beyond 600.

So I had the Mi Air Purifier 2 running and after 22 minutes, the PM 2.5 came down to 66 and I can see the room was cleared of the smoke. The odor was also considerably reduced. After 40 minutes, the PM 2.5 came down to 42 and the odor was completely gone. As I had it in auto mode, the speed of the fan was high and I could head the sound. After 20 minutes, the speed came back to normal.

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I have kept the Mi Air Purifier 2 running in my home office. It is always on and I barely hear the sound. The design also does not scream attention and I sometimes forget that there is a purifier in the room.

Anyways, as I said, there is no set standard to measure the AQI and every monitor has its own way of measuring it. With what I can see on the Purifier, I can say that it has a promising performance.

Should you buy it?

If you are living in a city where air pollution is a potential threat to well being, you must definitely consider getting it. If there is a pollen alert in your area, you must definitely consider this. If you have a hairy pet or living with someone who smoke, this would definitely be a good investment. It is priced at Rs 9999 and will be available in India on Mi.com and other online retailers. The HEPA filter replacement would cost you Rs 2499 every 4-6 months, which is 1/4 the price of the purifier itself. You can clean the out filter and get a bit more life time for it, but eventually you have to be replacing it. But for Rs 9999, the Air Purifier 2 is a good buy for a healthy life style.


P.S: Plant more trees. Trees are nature’s air purifiers. Reduce your carbon foot print and strive to leave a better world for the next generation to enjoy.


Manufacturer Xiaomi
Type Air purifier
Cleaning method Mechanical filtration and adsorption
Filter type PET primary filter, HEPA (High-efficiency Particulate Arrestance) filter, activated carbon adsorption filter
Purification capacity 330m³/h
Purification efficiency – 100% — large particles
– 99,3% — particles to 0.3 micrometre
– 99,99% — particles to 2,5 micrometre
– 91% — formaldehyde and other harmful substances
Recommended effective area 23m²~39m²
Smart modules – Wi-Fi module 802.11b/g/n
– Air quality sensor
– Temperature and humidity sensor
Power consumption 1.5W~75W
AC 100V~220V 50/60Hz
Noise level 31dB
Dimensions 240 x 240 x 520 mm
Weight about 4.8kg (with filter)

For more details, visit mi.com


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