MI Xiaomi Smart Air Purifier 4 Lite, High Efficiency Filter, Removes 99.97% Airpollutants, Bacteria & Viruses & Odor and Air Purifier 4 Lite Filter

Transformative Air Purifier with Advanced Features and Superior Performance!
I recently purchased this Mi Air Purifier, and it has significantly improved the air quality in my home. My allergy symptoms have noticeably reduced, and the built-in ionizer and laser sensor ensure real-time monitoring and neutralization of pollutants. Covering an area of 516 sq.ft, it is perfect for large rooms, and its quiet operation keeps our home peaceful.The OLED touchscreen is user-friendly, providing clear information on air quality and filter status. Its sleek, modern design fits perfectly with our decor. Mi has truly delivered a reliable and efficient air purifier with this model. If you’re looking to improve your indoor air quality, I highly recommend the Mi Air Purifier.

Excellent in every aspect
Great product with a capability to reduce dust by approximately 3/4 e.g. if atmosphere pm2.5 is 300ppm , it will be reduced to upto 75ppm inside room , only if minimum ventilation is provided to take care the CO2 we generate.In my case , I have found in my area that the ambient has CO2 at ~410 ppm. If we open one window door to only by 5mm clearnce, the CO2 is being maintained from 500 to 600 ppm with 2 adults inside the room , based on wind velocity and direction. This adjustment 5mm clearance was achieved measuring with “calibrated stand alone CO2 cum PM 1.0, 2.5 , 10 measurement meter”One more example with above ventilation arrangement, the machine is in auto and ambient air pm2.5 at 198ppm, room also at 198 ppm, the fan speed reached medium (sound audible), it took some time to reach 85ppm and then it took 1min from 85 ppm to 68 ppm, now fan speed changed to low speed in Auto (sound is inaudible), this ppm starts increasing gradually to 85ppm in 1.5 minutes, now fan speed increases to medium again and the cycle repeats as long as outside pm 2.5 is 198ppm.Similarly the fan speed (so it’s sound) can be very high if ambient pollution is very high.It needs external cleaning of it’s HEPA filter every month based on pollution. The sensor may need cleaning every 3 months for accurate readings (if sensor mal functions , it is to be cleaned first and check before taking to any service center).It has a simple filter element with spare availability and capable to give atleast 3 times the specified life, if we clean the HEPA filter element externally with vacuum cleaner regularly.It does not have ozone producing UV rays or ion generators, which if not properly designed ( specified to customes not worry) may pollute the air with ozone.It has particulate count PM 2.5 meter which is very accurate, in addition it change display colour according to pollution zones to know the condition of air in the room (The readings were authenticated with above calibrated stand alone meter CO2, PM1.0, PM2.5 and PM10).We have to keep it on Auto to facilitate to change flow /speed based on pollution level (it’stemperature and humidity meters are also useful).Update 24.04.22 (still under warranty) : It developed some abnormal sound just audible , when we go near to it (like kitch, kitch, kitch..) at lowest speed. Doubt was on loosening of bottom locknut of fan and sound is ruled out from fan bearings, this diagnosis also strengthened by the observation that the above sound disappeared, when it is made upside down.Bottom cover opened , side covers opened , the bottom grill was moved down by lifting lock with columns and it was found that the button lock nut was in slightly loose condition as anticipated. The abnormal sound and mild vibration problems are resolved after tightening the nut (with 13mm tubular spanner already available with me), holding the fan (nut is a self locking type) and assembled back , But opening of side covers is a tricky and risky job (some locks may be broken, use hand gloves to protect hands from sharp edges , they may open in jerky motion ). I have made some top grill locks bottom side open by cutting (modification) so that I can open the panels easily in future. However another Mi Air purifier 2S is working almost continuously without any problem from last 3 years.Update: 02.07.22 High abnormal sound observed. This time I want send it to service center , but while lifting some material flied off from grill. So, when I run it upside down many foreign material came out like some bodies of flying ants , their wings and one baby lizard. Now again it is working normal.17.01.2023 The filter replaced as the flow became very low after 14 months of almost continuous use in high PM 2.5 conditions. Hence the time taken to reduce pm 2.5 had increased to an extend that it is unable reduce less than 150 , while ambient is at 300. The effectiveness restored after filter replacement.

Excellent purchase, it’s a lifeline in Delhi.
“Absolutely thrilled with my Mi Air Purifier! This review is post 20+ days usage of this pdt. Not only does it effectively remove dust and allergens from the air, but it’s also whisper-quiet, making it perfect for use in any room. The sleek design fits seamlessly into my home decor, and the intuitive controls make it a breeze to use. Breathing cleaner air has never been easier or more stylish. Highly recommend!”

Budget friendly
It is an average product.The filter seems to be working fine but I was surprised that the filter came at 99% capacity out of the box.Additionally, a week of use had brought the filter down to 92% which is extremely worrisome to me because according to this I will have to change filters every 3 months despite it being used strictly in my bedroom which is on the 12th floor and there is barely any pollution and dust in the rest of my house.Apart from this I have been using Philips purifiers also and I am much more satisfied with their performance.Another issue is the terrible noise. These are a bit too noisy for their small size.The application is okay-ish and has the basic functions which are required but again the beep that this purifier makes when u change any setting is just terrible. It beeps like a nokia 1100 would vibrate. Imagine that if you can. Not happy.But otherwise, the positives that you extract at this price point is not bad.Wifi integration, 360 degree air-intake, full app customisation, multiple fan speeds including sleep and turbo modes, HEPA filter..it is worth the cost if you can overlook the negatives.