Xiaomi Air Purifiers: What is the Difference Between Models and Which One to Choose?

Choosing a Xiaomi air purifier is a challenge, with a range of devices ranging from the compact Mi Air Purifier 3 to the powerful Smart Air Purifier Max, and it’s hard to understand the differences without detailed analysis. The models are not only design-based, but also filter performance, noise levels, smart home features and even mobile app compatibility.

Many buyers mistakenly believe that the price is the main thing, but in practice, the key parameters depend on the area of the room, the presence of pets or allergies in the family. For example, Xiaomi Mi Air Purifier 4 Pro will cope with pollution in the large living room, while Mi Air Purifier 3H is more suitable for the bedroom. And if you need a humidifier cleaner, then you will need a model from the Smartmi series, a subsidiary of Xiaomi brand specializing in climate technology.

In this article, we’ll take a look at all of Xiaomi’s current air purifiers, compare them by 10 key parameters, and help you determine which device is right for you, and learn which smart controls each model supports and how to avoid overpaying for unnecessary features.

1. The main lines of Xiaomi cleaners: who is who

There are four main series of air purifiers from Xiaomi and its sub-brand Smartmi on the market, each focused on different tasks and budgets:

• 🔹 Mi Air Purifier 3/3H/3C — Budget models for small rooms (up to the 28–48 They are compact and minimalistic in size, suitable for bedrooms, children's or office rooms.
• 🔹 Mi Air Purifier 4/4 Pro/4 Lite – mid-segment with improved performance (up to) 60 m2) and support Wi-Fi/Bluetooth. There are models in the lineup with OLED-display and extended settings.
• 🔹 Smart Air Purifier Max - flagship series for large rooms (up to 100 m2). equipped with a three-stage filtration system, including HEPA H13, Supports voice control via Alice or Google Assistant.
• 🔹 Smartmi Air Purifier – premium humidification devices ideal for dry climates or during the heating season.

It is important to understand that Xiaomi regularly updates the model range, so old versions (for example, Mi Air Purifier 2) have already been discontinued and are not supported by the proprietary Mi Home app.

Key technical differences: comparative table

So to keep the specs from getting confused, we've put the basics of the popular models into a table, and you've got to pay attention to the surface area, which is the main criterion for choosing. For example, if you're a studio of 30 m2, the Mi Air Purifier 3H will do the job, but you'll need 4 Pros or Maxs for a 50 m2 room.

Critical: The CADR (Clean Air Delivery Rate) measures how many cubic meters of air the device cleans in an hour. The higher the CADR, the faster the cleaner will cope with the pollution. For example, the Smart Air Purifier Max with a CADR of 1000 m3 / h is 2.5 times more powerful than the Mi Air Purifier 3H (CADR 380 m3 / h).

⚠️ Warning: Manufacturers often specify the maximum surface area calculated for ideal conditions (low dust, closed windows). In reality, the efficiency drops by 20-30%. If you have smokers, animals or live near the road, take a model with a margin of area.

3. Filters: what are and how often to change

All Xiaomi cleaners use a multi-stage filtering system, but the composition of filters varies depending on the model.

1. Preliminary filter - traps large dust, animal hair, down.
2. HEPA-filter - picks up small particles (pollen, bacteria, viruses) and uses the Pro and Max models HEPA H13 (Detains 99.97% of particles of 0.3 microns).
3. Coal filter - neutralizes odors (tobacco, cooking, chemistry).

In premium devices like Smart Air Purifier Max, you add an antibacterial layer treated with silver ions, which is true for families with children or allergies, and Smartmi models also have a moisturizer that keeps humidity at 40-60%.

The service life of filters depends on the intensity of use:

• 📅 HEPA + carbon filter: 6-12 months (average 8 months with 8 hours of operation per day).
• 📅 Pre-filter: can be washed with water 1 time in 2-3 months.
• 📅 Moisturizing filter (Smartmi): 3-6 months (requires regular scale cleaning).

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Don't buy cheap, unoriginal filters! They can not only purify the air worse, but also emit harmful substances when heated. Xiaomi's original filters are certified GB/T 18801-2015 (Chinese safety standard).

4.Smart features: what Xiaomi cleaners can do

All modern Xiaomi models support management through the Mi Home mobile app (or Xiaomi Home for new devices).

• 📱 Remotely turn on/off the cleaner.
• 📊 Monitor air quality in real time (indicators) PM2.5, temperature, humidity).
• ⏱ Set up a schedule (for example, turn on full power at night).
• 🔄 Notifications of the need to replace the filter.

The flagship models (4 Pro, Max, Smartmi) support additional chips:

• 🗣 Voice control via Alice, Google Assistant or Siri (via HomeKit for Smartmi).
• 🌡 Automatic mode with sensors TVOC (volatile organic compounds) and CO₂.
• 🔗 Integration with other Xiaomi devices (e.g., the cleaner can be activated when you open a window if you have a Mi Window Sensor connected to the system).

However, there are nuances: some older models (for example, Mi Air Purifier 3) do not support Bluetooth, so to configure them will require a connection to Wi-Fi 2.4 GHz (5 GHz does not work!).

5. Noise level: what is important to know

One of the key parameters that is often overlooked in the selection process is noise level. The specifications usually indicate a range (e.g. 34-67 dB), but what does this mean in practice?

• 🌙 Night mode (30-35 dB): comparable to a quiet whisper.
• 🏠 Average power (40–50 dB): as a quiet conversation or air conditioning.
• 🚀 Maximum power (60-70 dB): vacuum noise, uncomfortable for long-term use.

The quietest models are the Smartmi Air Purifier P1 (from 25 dB at night) and Mi Air Purifier 4 Lite (from 32 dB). But the Smart Air Purifier Max at maximum power outputs up to 68 dB - this is loud, but justified for large rooms where the device quickly cleans the air and goes to quiet mode.

⚠️ Warning: If the cleaner is constantly running at high speeds and does not switch to quiet mode, check: Is the windows closed (the influx of outdoor air with dust makes the device work harder) Is the pre-filter clogged (it can be washed with water). Air quality sensor installed correctly (does not have to be closed by furniture).

Set the device on a flat surface (vibration increases noise)|Use night mode in the bedroom|Close windows while working|Clean the pre-filter regularly.-->

Which model to choose: scenario recommendations

In order not to overpay for unnecessary functions, focus on your tasks:

• 🏡 Studio apartment (up to 30 m2): Mi Air Purifier 3H 4 Lite: Compact, quiet, with basic smart controls.
• 👨‍👩‍👧‍👦 Family with children/allergic: Mi Air Purifier 4 Pro (filter) HEPA H13) Smartmi P1 (if you need a humidifier).
• 🏢 Large apartment or office (50-100 m2): Smart Air Purifier Max is the only model with a high-performance model. CADR 1000 m3/h.
• 🐕 Pets: any model with a pre-filtered wool filter (all modern Xiaomi cleaners are equipped with it.
• 🌿 Dry climate or heating season: Smartmi Air Purifier with humidification function.

If you want to integrate with a smart home, look for models that support HomeKit (such as Smartmi) or Google Assistant (4 Pro, Max). For minimalists, Mi Air Purifier 3C is suitable - without a display, with control only through the application.

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For allergy sufferers and asthmatics, the HEPA H13 filter is critical, trapping 99.97% of particles, including pollen and mold spores, which are found in the 4 Pro, Max and Smartmi models.

7 Cost of Ownership: How Much to Spend on Filters

When buying an air purifier, many people forget to consider the cost of replacing the filters. For example, the original kit for the Mi Air Purifier 4 Pro costs about 3,500. ₽ It requires a replacement every 8 to 12 months, and in 5 years of use, you'll spend the same amount on filters as the device costs!

Compare the cost of popular models (calculated for 5 years, when replacing filters once a year):

You can save money by buying filters during sales (for example, on AliExpress or in the official Xiaomi store during Black Friday), and some users flush the carbon filter (although the manufacturer does not recommend this – the efficiency drops by 30-40%).

8. Frequent errors in selection and operation

Even after buying, many users make mistakes that reduce the efficiency of the cleaner.

• 🚫 Installation in the corner or behind furniture. Air quality sensors should be open and air flow free. Optimal distance from walls: 30-50 cm.
• 🚫 Open windows, the cleaner can't handle the constant influx of polluted air.
• 🚫 Ignoring the filter replacement indicator: A clogged filter not only cleans worse, but also increases the load on the engine, reducing the life of the device.
• 🚫 If your room is 25 m2, do not take a model for 28 m2 - take 40-50 m2 for power reserve.

Another common problem is the in-app configuration that is not right, for example, many people leave the cleaner manually at minimum power, although Auto mode is more effective at adjusting to current air quality, and it is also useful to set a schedule (for example, turn on full power an hour before you wake up).

FAQ: Answers to Frequent Questions