Xiaomi Mijia Air Purifier 4 Lite review: Good option for small-sized families

It is time to use air purifiers once more. Many people, including myself, have purchased the Xiaomi Mijia Air Purifier 4 Lite. But I have a question for you: have you purchased the proper air purifier? I used to spend $300 on an air purifier from a particular brand. The air purification effect cannot be stated, but it is not very comfortable to use. First and foremost, I use it in my bedroom. Even with the silent mode turned on, I can always hear the air purifier working late at night. Second, it only supports remote control operation and no APP control.

Furthermore, the remote control is very small, and it is sometimes difficult to locate the remote control. Furthermore, because the air purifier is large and crowded in the bedroom, I always want to replace it.

Since the Mijia family has added smart home products to the home in recent years, my replacement goal is to purchase a Mijia air purifier. Mi Home Store has 8 air purifiers for sale. After careful parameter and volume comparisons, the Xiaomi Mijia Air Purifier 4 Lite, which Xiaomi recently launched, was chosen. Of course, the sassy and square appearance of the Mijia Air Purifier 4 Lite drew me in, and it looks even more manly when placed on a shelf.

DesignIt is simple to select Mijia Air Purifier 4 Lite because it is small. It measures 53.35 cm high, 24 cm long, and 24 cm wide, and is nearly half the size of the air purifier I previously used. Furthermore, the Mijia Air Purifier 4 Lite has a small footprint.

I looked into the Xiaomi Mijia Air Purifier 4 Lite official website specifications. Its structure is straightforward. Overall, anti-oxidation ABS is used, which is more durable than standard engineering plastics. The lower half is the air inlet, which has a built-in air filter, and the air inlets are the densely packed holes in the lower half. The top is a horizontally symmetrical grille, and the upper part is an air outlet with a built-in high-efficiency fan. Unfortunately, unlike the Mijia Air Purifier 4, the grille is not detachable.

Mijia Air Purifier 4 has a touch button on both sides of the horizontal bar grille on the top, a power button on the left, and a mode switch button on the right. In the power-on state, press the mode switch button to toggle between three operating modes: automatic, sleep, and favourite.


Mijia Air Purifier 4 Lite, like previous Mijia air purifiers, features a circular LED digital display with three numerical displays of PM2.5, indoor temperature, humidity, as well as operation mode WIFI status display, night. You can dim the screen’s brightness or turn it completely off. Furthermore, the bottom has a three-colour light bar that provides intuitive feedback on indoor air quality. Green indicates fresh and clean air, yellow indicates moderate or mild air pollution, and red indicates severe air pollution.

Laser Sensor

Xiaomi Mijia Air Purifier 4 Lite also has a high-precision laser sensor, which is visible by opening the back cover, as well as the sensor can be cleaned later with a hairdryer. This sensor is the most important component of the Mijia Air Purifier 4 Lite. With it, the Mijia Air Purifier 4 Lite can monitor real-time air quality and detect small air particle changes to m3. Furthermore, the power interface and display switch key are all located on the back of the air purifier.

I’m not happy with the design of the power connector on the first few Mijia air purifiers because the air purifier needs to be positioned at least 20 cm away from the wall. The old air purifier’s power interface is located near the bottom. The in-line power connector is used, which makes it easy to wrinkle the power connector when inserting it, reducing service life. This time, the Mijia Air Purifier 4 Lite uses an L-shaped power connector, which is more practical, but the charging head is much larger, causing slight interference when used.

Filter Element

The filter element is replaced in the filter element compartment within the lower half of the Mijia Air Purifier 4 Lite. Its filter element compartment is opened in an unusual manner. On each side of the air purifier body, a release button is pushed inward. Lift the upper part of the cleaner upwards and remove it from the filter element compartment by pressing the release button on both sides with both hands at the same time. Simply remove the old filter. After replacing the filter element, press the power and display switch buttons simultaneously to put the filter element in standby mode.

Mija App

You can use the Mijia APP to perform routine tasks such as turning on and off the machine, switching between automatic, sleep, and favourite modes, and adjusting the display’s brightness. If you want to set the automatic shutdown, you can use the timer switch. You can also disable the operation beep, enable the child lock, view the filter element’s usage time, and even create smart usage scenarios to connect to other devices.

Xiaomi Mijia Air Purifier 4 Lite has a functional area of 26-45 square metres and the fastest can deliver 6330L of clean air per minute. In comparison, the total area of my home is approximately 130 square metres, and the bedroom area is approximately 15 square metres, so it is sufficient for use in the bedroom. Even in the living room, it is perfectly adequate. Turn on sleep mode at night, keep the LED digital display screen, no light or noise interference, and sleep peacefully all night. Furthermore, the Mijia Air Purifier 4 Lite has a level 1 energy consumption, which means it uses less energy and saves more power.


I immediately noticed an increase in bedroom space after replacing the old air purifier with the Mijia Air Purifier 4 Lite, and my children are no longer concerned about accidental bumps. In general, the Mijia Air Purifier 4 Lite is an excellent choice for small families. Although it is smaller, it takes up less space and uses less energy. The overall efficiency of air purification is also high. The antibacterial rate is 99.99%, the formaldehyde CADR is 120m3/h, and the particulate matter CADR is 380m3/h. Furthermore, the air purifier 4 Lite is quieter. In sleep mode, the noise is as low as 35.8dB(A), almost completely ignoring its “existence,” making it more suitable for families with elderly and infants.

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