Xiaomi Air Purifier 2 Review

When it comes to air purifiers, only a few brands come to mind; Sharp, Panasonic and the not-often-heard-of Coway. These brands are household names and mostly the ones you find in Malaysian homes. Well another company has come along and has released their second air purifier to the market. That company is the maker of the Mi phones. Yes, Xiaomi. You wouldn’t really relate Xiaomi with air purifiers but they have a huge range of home products ranging from smart lightning, rice cookers and a washing machine to robot vacuums. This review is abit late considering that it was released way back in November 2015 in China . But hey, better late than never. So on with the review of the Xiaomi Air Purifier 2!



Xiaomi Air Purifier 2.

The Air Purifier 2 has got it sorted in the looks department. It is white and stands tall at 52cm  and has a depth of 24cm . This air purifier has three intake vents that’s present at the front, and at both sides. They’re designed in a way that ‘disappear’ as they flow up. Very slick indeed. The Power/Function button is located at the top while the 3 mode indicators are at the side; Auto, Sleep, Favorite.

Top: Power/Function button.  Side: Auto, Sleep, Favorite mode indicator.
Top view.



Setup was straightforward but there’re a few things to take note off. First, depending on where you order the Air Purifier 2 from, it will likely come with a Chinese manual. This presents a challenge for me as I can’t speak nor read Chinese. Luckily Xiaomi has also an English version available. Link to the English Manual pdf here.

1. Download MiHome app (Android or iOS).

MiHome app on the Google Play Store.

2. Set location to Singapore server. To do that, Launch the MiHome app > Go to Profile > Settings > Region > Select Singapore. If you do not, the Air Purifier 2 will not show on the list of available smart devices. Not sure why this is the case but yeah. This is what you’ll see if you chose Singapore region:

List of Xiaomi smart devices.

3. Once done pair the app with the air purifier. Launch the MiHome app > Select the ‘+’ icon on the top right > Scan or Add manually.

Scan for the air purifier or add it manually.

4. Once paired you will see the Air Purifier 2 on the Mi Home screen.

The air purifier is now added.


The most important component; The filter. Xiaomi has 3 filters for you to choose which I will list below. One of them is a HEPA filter and I will first briefly describe what HEPA means. Most air filters/purifiers in the market these days come with a HEPA filter. Depending on which source you’re referring to, you will find slight variations of the HEPA measurements. For this article we will refer to new European Standard EN 1822. EN 1822 defines a HEPA filter to trap 99.97% of dust particles that are 0.3 microns in diameter. Below is the measurement by  EN 1822.

Integral Value Local Value
 Filter Class  Collection Efficiency % Penetration %  Collection Efficiency % Penetration %
E10 85 15
E11 95 5
E12 99,5 0,5
H13 99,95 0,05 99,75 0,25
H14 99,995 0,005 99,975 0,025
U15 999,995 0,0005 999,975 0,0025
U16 9,999,995 0,00005 9,999,975 0,00025
U17 99,999,995 0,000005 999,999 0,0001

The filter class description are:
EPA 10 – EPA 12: Efficiency Particulate Air Filters
HEPA 13 – HEPA 14: High Efficiency Particulate Air Filters
ULPA 15 – ULPA 17: Ultra Low Penetration Air Filters


Filter – Blue Colour (Economic Version)

This was the filter that came with the Xiaomi Air Purifier 2. It is an EPA (Efficiency Particulate Air) filter that’s able to trap particles that’re 0.3 microns in size. Essentially you can consider this as the standard default filter.

Economic Version.
Filter – Green Colour (Formaldehyde/Enhanced Version)

The ‘specialty’ of this filter is that its designed to target Formaldehyde. According to the CDC, ‘Formaldehyde is a common chemical that can be emitted from a number of products in the home. Smoking, pressed wood, and particle board have all been shown to be sources of formaldehyde. Higher formaldehyde levels are usually found in newer homes or homes with new construction.’ On the Xiaomi website, this filter is advertised as a H11-grade HEPA filter that filters up to 99.3% of 0.3 microns. If we go by the EN1822 standard, you will see that this filter doesn’t meet the HEPA standard today. This is because the updated EN1822 standard has now categorized H11 as E11 making this filter EPA and not HEPA. Granted, this filter was released a while back in 2015 so the HEPA definition would have stood still then.

Formaldehyde/Enhanced Version.
Filter – Purple Colour (Antibacterial Version)

This filter has an antibacterial layer can trap and kill dust mites. It’s able to trap 0.3 micron particles but it doesn’t mention whether its a EPA or HEPA filter.

Antibacterial Version.
Filter – Which to choose

If you aren’t fussy about filter grading, then you have 2 options; the Economic Version (Blue Colour) and the Antibacterial Version (Purple Colour). Get the Economic Version if you want a standard filter and Antibacterial Version if you want something that targets bacteria and dust mites. If you want a HEPA filter then the Formaldehyde/Enhanced Version (Green Colour) type is your choice. It’s worth noting that all 3 filters come with an activated carbon layer.


Usage and Performance

Usage and Performance – Air Quality Index

The app’s interface is minimilist and straightforward. Once launched, you will be able to see environment conditions such as Temperature and Humidity. Also recorded is the Air Quality Index, Filter Running time (days and hours) and the amount of clear air delivered (cubic metres). All these are made possible by the PM2.5 sensor that’s embedded in the Air Purifier.

You’ll be able to see the air quality recording.
Other environment conditions are also recorded.


Usage and Performance – Auto Mode, Sleep Mode, Favourite Mode

Using the Air Purifier 2 was simple. Once turned on, you can either press the physical Power/Function to toggle between modes or select them via the Air Purifier 2 app. There are 3 modes provided in the app; Auto, Sleep and Favorite.

Auto Mode

The auto mode automatically switches modes according to air quality condition. Which means if it detects that the air quality is getting worse, it will increase its work rate.

Sleep Mode

Sleep mode should be used if you want a quiet night’s sleep. Which means it goes into low setting to minimize noise. As the air purifier is stationed in my living room, there wasn’t any need to use this mode.

Favorite Mode

In this mode, you select the total coverage area of the room where you plan to place the air purifier. Which means you first need to measure the width(metres) x length(metres). In my opinion this is the best setting to choose because the air purifier will operate at a level which is relative to the area it’s covering. It should be that way as you wouldn’t want it to be on low setting while trying to cover a large area and vice versa.

Available selection of modes.


Usage and Performance – Automation and Scheduling

One great feature I like about using the app is the ability for creating your own automation task and scheduling. Let’s talk about the automation first. With the automation task, you can create ‘if-then’ statements. Pretty geeky i know. An example of automation you can create; If the air purifier detects the air quality at a certain level, the air purifier will turn on. Another funny one you can create; Trigger the air purifier when receiving a phone call. With scheduling, you can create multiple schedules for the air purifier to operate. Personally I have created a schedule to turn on 15 minutes before I reach home from work.


Usage and Performance – Air Quality

Now many of you can’t wait to find out how’s the air quality like after using the Air Purifier 2. To set expectations right, I didn’t have any scientific testing method like the Clean Air Delivery Rate (CADR). Instead I only relied on the second best thing, my nose. I qualify for that because the area I live in is an industrial area and partly surrounded by factories. In addition, there’re also constant open burnings that result in short periods of haze in the middle of the night.

So based on my sense of smell alone, I’m pleased to inform that the Air Purifier 2 works impressively well. There have been numerous occasions where the air outside was filled with either a burning smell or a chemical odour. After turning on the air purifier 2 for about 5-10 minutes, the air in the house was clean, fresh and to a degree crisp. This was of most importance not only to my health but also to our newborn. Plus the fact that I have a dog and cat, ensuring good air quality in my house was high priority.


Smart Home Integration

Xiaomi has got you covered with Amazon Alexa and Google Assistant integration. And both works like a charm. Just search for ‘Mi Home’ as the service to connect to when setting it up. I did find that using the Google Assistant was slightly faster by 1 to 2 seconds compared to Amazon Alexa.



Some may be wondering how loud is the Air Purifier 2. Well, the level of sound emitted depends on how hard it works. The higher work rate, the louder it gets. Nothing too distracting to be honest, and after a while its just like white noise.


Where to buy

Tap on link twice if it doesn't bring you to the product page


Buy the Mi Air Purifier 2 here.


Buy the Mi Air Puridier 2 and 2S here.

Mi Air Purifier 2

Mi Air Purifier 2S

*Important* Do note that the 2S model has an NFC reader which will detect filters (which have an NFC embedded tag) for authenticity. When purchasing replacement filters for the 2S, ensure that the online merchant mentions ‘2S’ as the supported models.


Final Thoughts

One of the main reasons I got the Xiaomi Air Purifier 2 was for the display of the air quality index. As far as I know, this is the only filter that has this ability. Other brands like Sharp in their mid tier to high end models only give indication whether the air quality is ‘Good’ or ‘Bad’. I’ve been using the Air Purifier 2 for about a month now and I’m very happy with it. The air in my living room remains clean and I’ve not been disturbed by the occasional air pollution in my neighbourhood.

Another point to note; As much as it is an air purifier, don’t expect it to clear the air from heavy duty cooking that have ingredients like garlic or onions. You need an exhaust fan for that. One minor gripe is that I would have hoped for another physical button to adjust the output level. Other than that, the Air Purifier 2 is an elegant product that does its job well. Highly recommended if you have a entry level air purifier and are looking to upgrade and also to try the Xiaomi brand.


[Update 25/02/2019: Intake vents are only at three sides. The original review mentioned four.]

[Update 23/03/2019: Do note that the 2S model has an NFC reader which will detect filters (which have an NFC embedded tag) for authenticity. When purchasing replacement filters for the 2S, ensure that the online merchant mentions ‘2S’ as the supported models. ]

Source: Camfil, Donaldson Filtration Solutions
Image credit: xiaomimy