Mi Air Purifier 2S – Complete Review

Mi Air Purifier 2S – Best Budget Air Purifier

The Mi Air Purifier 2S helps you breathe easy. It fills your house with fresh air and reduces indoor air pollution. It fights allergies and odors, and keeps your family safe. The Mi 2S has a chic contemporary design. It complements urban decor and enhances the aesthetics of any room it is placed in.

We recently did a deep-dive into the workings of the Mi 2S and came up with some pretty impressive findings. Here are the details of our study. We have categorized the literature under two headings, air purification technology and physical design. We hope you find our research useful.

Air Purification Technology


The Mi 2S has a 3-stage air purification system. It comprises of a 360ᵒ cylindrical filter with 3 dense layers. The first layer intercepts large pollutants like hair, dust, sand and lint. The second layer is built with H11-grade filtration technology from Toray, Japan. It traps micron-sized particles like bacteria, viruses, particulate matter, dust mites, pet dander, pollen and spores. The third and innermost layer is made of activated carbon.

Activated carbon has a large surface area with millions of tiny pores that attract passing gas molecules. The molecules attach themselves to the surface of the carbon and are thus removed from the air current. This last layer is instrumental in fighting gaseous impurities like bad odors and cooking smells. It also eliminates volatile organic compounds (VOCs) like formaldehyde and ammonia.

The Mi 2S air purifier has a coverage area of 37 m2. It has a Clean Air Delivery Rate (CADR) of 310 m3/h. CADR indicates the volume of air from which all the impurities of a certain size have been removed in an hour. It is a figure of merit given to air purifiers to quantify their capacity to remove air pollutants. A CADR of 310 m3/h means that the Mi 2S can remove all the allergens from a space of 310 m3 once every hour.

According to the CADR Test report published by the Guangzhou Industrial Microbiology Testing Centre, the Mi 2S can filter all the air in a 21 m2 room 2.4 m high once every 10 minutes. In other words, the Mi 2S has enough muscle to serve small to medium-sized rooms.

The purifier is equipped with high-precision laser sensors that pick up the presence of particulate matter as small as 0.3 micron. The live air quality data is displayed through the onboard OLED screen. The Mi 2S is an intelligent device that adjusts its illumination according to the ambient light. When you turn off the lights at bedtime, the device automatically dims its own brightness to help you sleep better.

The air cleaner is a Wi-Fi-enabled smart home appliance. It responds to voice commands from Amazon Alexa and Google Home devices. Voice control makes the purifier very easy to handle. You can manage its functions remotely without having to walk up to the gadget.

The Mi 2S can also be controlled via the Mi Home app. It is an all-purpose app that lets you monitor the air purifier from anywhere. You can turn on and turn off the device through the app, and also regulate the speed of the fan, set the timer, and change the modes. You can check the AQI, temperature and humidity levels. The app also informs you when the filter needs a replacement.

The Mi 2S is an energy-efficient gadget. It is powered by a Japanese Nidec motor which consumes just 4.8 watts of energy in normal cleaning mode. Indeed, even a fluorescent light bulb consumes more energy than the Mi 2S. Average power consumption is between 4.8 to 29 watts. The appliance has whisper-silent operation and has a special Sleep mode for night hours. At this mode the device is barely audible so you and your family can sleep in peace.

We have come to the end of the technology segment. Now let us take a look at the design aspects of the purifier.

Physical Design

The Mi 2S has a 360ᵒ filtration pathway that facilitates air intake from all directions. It has an efficient tower structure that allows for maximum air purification from a compact housing. The purifier draws in dirty air through 943 holes on its four sides and dispenses fresh air through the circular vent on top.

For optimum performance, the manufacturer recommends maintaining a minimum distance between the gadget and walls or other obstacles. A gap of 10 cm is desirable behind the device and 20 cm on the other three sides. This will enable a freer flow of air around the gadget and ensure clean air reaches every corner of the room.

The Mi 2S has a white enclosure with an OLED display in front. The display shows the current PM 2.5 reading and real-time indoor AQI through a 3-color rating system. Green means the AQI figure is between 0-75, yellow means it is 76-150 and red means it is higher than 150.

The display also shares the temperature and humidity levels, cleaning mode and Wi-Fi status. A button at the back of the device allows you to switch off the display if you like. The top panel of the Mi 2S has a power button. Press it once to turn on the device. Press it again to switch modes between Sleep, Favorite and Auto. To turn off the device, press it and hold for 2 seconds.

The air cleaner has advanced sensors that measure the air quality, temperature and humidity. These sensors operate through vents at the back of the purifier. The Mi 2S measures 240 mm x 240 mm x 520 mm. It weighs 4.5 kg with the filter included. The package includes the air purifier, the filter, a power cable and a user manual.

Key features:

  • Air purifier with 360ᵒ 3-layer filtration system
  • H11-grade filtration technology from Toray, Japan, OLED display, Laser Particle Sensor
  • Removes micron-sized particles, bacteria, particulate matter, dust, pet dander, spores, odors, formaldehyde
  • Coverage area 37 m2, CADR 310 m3/h
  • Compatible with Alexa and Google Home devices, app-controllable
  • Live AQI indicator, filter change indicator, 3 modes, automatic brightness control

3.5/5 (233 Reviews)

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