Xiaomi Mi Air Purifier 3H Review (Singapore model)

This blog post reviewed the Xiaomi air purifier model 3H. Currently in the market, you hardly can find the old model but just in case you are curious, the 3H model is better than its 2S model in the following aspects:

  • Effective area: Now 32 to 48 meter square (increased by 29%)
  • CADR (Clean Air Delivery Rate): Now 400 meter cube / hour (increased by 30%)
  • Improved wind path system.
  • Increased wind output.
  • Lower noise generated.

It is also better to get 3H as compared to the 3C model because it is easier to buy the extra filter for 3H as rather than 3C..

The air purifier is quite small and compact compared to other models.

The dimension is 24cm (width) x 24cm (depth) x 54cm (height). It weight about 4.8Kg (including filter).

It can also tell you the current state of your surrounding air condition, which I find it useful.


I also like that it can also connect to the Mi app to control the device.

If you are thinking of buying an air purifier for your study room or bedroom, then this is definitely a good choice!

Recent Reviews


Group Buy Deal

Qoo10 runs group buy deal sometimes, you can click here to check it out.

Just remember to add extra warranty just in case..


Purchase additional filter

Filter needs to be changed around every 6 months depending on your room’s air quality. You can click here to purchase extra filter at discount too! The filter comes with unique RFID which means it is genuine. Look out for these tagging if you buy filters from other places!

Special note: Do buy the purple color if you are concerned about virus and bacterial in the room.


What is PSI?

PSI stands for ‘Pollutant Standards Index’. It is an index to provide accurate and easily understandable information about daily levels of air quality.

PSI is computed based on 24-hour average of PM2.5 concentration levels, among other pollutants. PM2.5 is the dominant pollutant during haze episodes.

The ambient air in Singapore is monitored through a network of air monitoring stations located in different parts of Singapore.

The monitoring stations measure concentration levels of particulate matter (PM10), fine particulate matter (PM2.5), sulphur dioxide (SO2), nitrogen dioxide (NO2), ozone (O3), and carbon monoxide (CO). These six pollutant parameters determine the PSI.

The PSI value gives an indication of the air quality as shown:

PSI Value PSI Descriptor
0 – 50 Good
51 – 100 Moderate
101 – 200 Unhealthy
201 – 300 Very unhealthy
Above 300 Hazardous

Technical details on how the PSI is calculated can be found here: Computation of PSI

How to select an air purifier for your needs

The following are some criteria for you to consider before buying an air purifier:

  1. HEPA filter and activated carbon filters – A good filter should have both HEPA and carbon filter as it will remove virus and odors in the air.
  2. Space needed – You also need to consider if you have enough space for a big size air purifier or just a small space for a modest one.
  3. Noise level – If you are buying a air purifier for your sleep, then you should select one with low noise level. This Samsung model has very low noise level as compared to other brands.
  4. Future cost – One key consideration is the cost for replacement of the air purifier. Remember to ask where can you buy the filter for replacement and how much it would cost you.

Hope you find these tips useful!