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Xiaomi Smart Air Purifier 4 Pro XM200039 Review | 46 Data compared

Avg. price in UK: ~£210
Avg. price in US: ~$240
Max. CADR: 500 m³/h
Maximum room area: 60 m²
Maximum noise level: 64 dB
HEPA filter: yes
Weight: 6.8 kg

Xiaomi Smart Air Purifier 4 Pro XM200039 review. Compare 46 technical specifications and user reviews to see how this product ranks in the Air Purifiers category and whether it is worth buying.

7.5

Very good

7.2

Very good

9.0

Exceptional

5.0
Bedroom use
Score components:
35.0%
1.0
Maximum noise level
30.0%
10
Night mode
20.0%
5.1
Maximum room area
15.0%
4.3
Weight
9.1
Allergy relief
Score components:
35.0%
10
Max. CADR
30.0%
10
HEPA filter
20.0%
5.5
Number of filtration stages
15.0%
10
Washable prefilter
9.1
Smoke removal
Score components:
35.0%
10
Activated carbon filter
30.0%
10
Max. CADR
20.0%
5.5
Number of filtration stages
15.0%
10
Air quality indicator

Best prices in UK

Best rankings

#1 in Best Xiaomi Air Purifiers
#26 in Best Smart Air Purifiers
#28 in Best Air Purifiers for Dust
#35 in Best Air Purifiers for Smoke
#35 in Best Air Purifiers for Mold
#35 in Best Air Purifiers with HEPA Filters
#36 in Best Air Purifiers
#36 in Best Air Purifiers for Pets
#126 in Best Air Purifiers for Bedrooms

Verdict

The Xiaomi Smart Air Purifier 4 Pro (XM200039) features a high Particle CADR of up to 500m³/h, allowing it to deliver 8,330L of clean air per minute and cover effective areas between 35–60m². Its three-in-one filtration system consists of a primary layer, a high-efficiency filter capturing 99.97% of 0.3μm particles, and 650,000mg of activated carbon alongside a negative air ionizer for active freshness. Key advantages include dual PM2.5/PM10 laser sensors for precise pollutant tracking, a clear OLED touchscreen display, voice-activated smart app controls, and an ultra-quiet Night Mode operating at just 33.7dB(A). However, users may encounter slightly passive automated responses in Auto Mode, and replacement filters can occasionally be difficult to source or expensive over time.

Technical Specifications of air purifier Xiaomi Smart Air Purifier 4 Pro XM200039

Overall score

7.5

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Popularity

What it is: An indicator based on the number of reviews received by products in the Air Purifiers category.

When it matters: When you prefer products in the Air Purifiers category that have been chosen and reviewed by many other buyers.

Performance

6.0

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Power

What it is: The electrical power consumption of the air purifier during operation, measured in watts (W).

When it matters: Helpful for estimating long-term electricity costs, particularly when running the unit continuously day and night.

Importance: HIGH

Max. CADR

What it is: The Clean Air Delivery Rate (CADR), measuring the volume of purified air delivered per hour in cubic metres.

When it matters: Crucial for determining how rapidly the purifier circulates and cleans room air, especially for severe allergies or larger spaces.

Importance: HIGH

Maximum room area

What it is: The maximum recommended floor area (in square metres) that the air purifier can effectively treat.

When it matters: Essential for matching the purifier's airflow capacity to your room size so all air is filtered thoroughly.

Importance: HIGH

N. of speeds

What it is: The number of manual airflow speed levels available to choose on the air purifier.

When it matters: Provides flexible control between whisper-quiet low speeds for sleeping and powerful high speeds for fast room clearing.

Importance: MEDIUM

Maximum noise level

What it is: The sound level emitted by the air purifier when running at its highest fan speed, measured in decibels (dB).

When it matters: Important if you plan to use the purifier in bedrooms, nurseries, or home offices where loud fan noise causes disturbance.

Importance: HIGH

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Features

9.2

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Air quality indicator

What it is: An optical or laser sensor system displaying real-time indoor pollution levels via color rings or numerical values.

When it matters: Provides immediate visual feedback on air cleanliness and confirms that the purifier is working effectively.

Importance: MEDIUM

Continuous purification

What it is: Engineered motor and filter architecture designed for safe, uninterrupted 24/7 operation without thermal degradation.

When it matters: Essential for maintaining permanently low allergen and dust concentrations in polluted urban areas or high-pollen seasons.

Importance: LOW

Auto mode

What it is: An intelligent operating mode that automatically increases or decreases fan speed based on live sensor pollution readings.

When it matters: Maximizes convenience and saves electricity by running quietly on low speed and ramping up only when pollution is detected.

Importance: MEDIUM

Timer

What it is: A programmable shut-off countdown timer that turns off the air purifier automatically after a set number of hours.

When it matters: Convenient for running the unit for a specific duration before leaving home or going to bed without wasting electricity.

Importance: LOW

Maximum timer

What it is: The longest selectable countdown duration available on the air purifier's timer, expressed in hours.

When it matters: Relevant if you prefer setting extended automated operating cycles, such as a full 8-hour workday or 12-hour overnight window.

Importance: LOW

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Design

5.1

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Color

What it is: The primary exterior color and aesthetic finish of the air purifier housing.

When it matters: Important for ensuring the appliance blends harmoniously into your room decor and furniture style.

Importance: LOW

white

Material

What it is: The primary manufacturing material used for the outer casing, such as ABS plastic, polycarbonate, or aluminum.

When it matters: Influences structural rigidity, scratch resistance, premium appearance, and ease of wiping clean.

Importance: LOW

plastic

Display

What it is: An integrated digital screen showing active fan speed, particulate pollution numbers, filter health, and active timers.

When it matters: Enables quick visual checks of air metrics and purifier settings directly on the device without picking up your phone.

Importance: LOW

Display position

What it is: The physical placement of the display screen on the body of the air purifier (e.g., top panel or front facade).

When it matters: Affects viewing convenience: top displays are easiest to read while standing, while front displays are visible from across the room.

Importance: LOW

front

Control type

What it is: The user interface mechanism for operating the device, such as capacitive touch keys, push buttons, or rotary dials.

When it matters: Determines tactile responsiveness, ease of operation in dark rooms, and durability over years of regular use.

Importance: LOW

touch, app, voice

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Xiaomi Smart Air Purifier 4 Pro XM200039 vs the average air purifier

Why is Xiaomi Smart Air Purifier 4 Pro XM200039 better than the average air purifier?

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2.08x higher CADR
Xiaomi Smart Air Purifier 4 Pro XM200039 provides a higher clean air delivery rate than the average air purifier (500 m³/h vs 240 m³/h).
What it is: The Clean Air Delivery Rate (CADR), measuring the volume of purified air delivered per hour in cubic metres.
When it matters: Crucial for determining how rapidly the purifier circulates and cleans room air, especially for severe allergies or larger spaces.
Importance: HIGH
Xiaomi Smart Air Purifier 4 Pro XM200039 provides a higher clean air delivery rate than the average air purifier (500 m³/h vs 240 m³/h).500 m³/h vs 240 m³/h
Supports Wi‑Fi
Xiaomi Smart Air Purifier 4 Pro XM200039 supports Wi‑Fi; the average air purifier does not.
What it is: Wireless connectivity enabling smartphone app pairing for remote operation, scheduling, and live air quality tracking.
When it matters: Allows you to inspect home pollution levels from work and turn on the purifier so you return home to clean air.
Importance: MEDIUM
Xiaomi Smart Air Purifier 4 Pro XM200039 supports Wi‑Fi; the average air purifier does not.
16 hours longer timer
Xiaomi Smart Air Purifier 4 Pro XM200039 offers a longer timer duration than the average air purifier (24 hours vs 8 hours).
What it is: The longest selectable countdown duration available on the air purifier's timer, expressed in hours.
When it matters: Relevant if you prefer setting extended automated operating cycles, such as a full 8-hour workday or 12-hour overnight window.
Importance: LOW
Xiaomi Smart Air Purifier 4 Pro XM200039 offers a longer timer duration than the average air purifier (24 hours vs 8 hours).24 hours vs 8 hours
Has a child lock
Xiaomi Smart Air Purifier 4 Pro XM200039 has a child lock; the average air purifier does not.
What it is: A safety lock feature that disables the on-device control panel buttons to prevent unintended changes.
When it matters: Essential in households with curious toddlers or pets who might accidentally switch off the purifier or alter speed settings.
Importance: MEDIUM
Xiaomi Smart Air Purifier 4 Pro XM200039 has a child lock; the average air purifier does not.
Supports voice control
Xiaomi Smart Air Purifier 4 Pro XM200039 supports voice control; the average air purifier does not.
What it is: Integration with voice assistants such as Amazon Alexa, Google Assistant, or Apple Siri for voice commands.
When it matters: Offers convenient hands-free control to adjust fan speeds, check filter status, or turn the purifier on and off.
Importance: LOW
Xiaomi Smart Air Purifier 4 Pro XM200039 supports voice control; the average air purifier does not.
Supports 360° purification
Xiaomi Smart Air Purifier 4 Pro XM200039 supports 360° purification; the average air purifier does not.
What it is: A cylindrical or multi-directional intake design that draws in polluted room air from all surrounding angles.
When it matters: Improves airflow circulation and offers versatile room placement without needing to position the intake toward open space.
Importance: MEDIUM
Xiaomi Smart Air Purifier 4 Pro XM200039 supports 360° purification; the average air purifier does not.
Has an ionizer
Xiaomi Smart Air Purifier 4 Pro XM200039 has an ionizer; the average air purifier does not.
What it is: An auxiliary electronic feature releasing negative ions that attach to airborne particles, causing them to clump and settle faster.
When it matters: Acts as a supplementary cleaning boost for fine dust, though buyers sensitive to ozone should ensure it can be toggled off.
Importance: LOW
Xiaomi Smart Air Purifier 4 Pro XM200039 has an ionizer; the average air purifier does not.
Supports delayed start
Xiaomi Smart Air Purifier 4 Pro XM200039 supports delayed start; the average air purifier does not.
What it is: A delayed activation timer allowing you to set a delay before the air purifier automatically turns on.
When it matters: Useful for scheduling the purifier to begin cleaning shortly before you arrive home so you step into fresh air without running it all day.
Importance: LOW
Xiaomi Smart Air Purifier 4 Pro XM200039 supports delayed start; the average air purifier does not.
2.08x higher CADR
Xiaomi Smart Air Purifier 4 Pro XM200039 provides a higher clean air delivery rate than the average air purifier (500 m³/h vs 240 m³/h).
Supports 360° purification
Xiaomi Smart Air Purifier 4 Pro XM200039 supports 360° purification; the average air purifier does not.
11 m² larger room area
Xiaomi Smart Air Purifier 4 Pro XM200039 covers a larger room area than the average air purifier (60 m² vs 49 m²).
Supports Wi‑Fi
Xiaomi Smart Air Purifier 4 Pro XM200039 supports Wi‑Fi; the average air purifier does not.
16 hours longer timer
Xiaomi Smart Air Purifier 4 Pro XM200039 offers a longer timer duration than the average air purifier (24 hours vs 8 hours).
Has a child lock
Xiaomi Smart Air Purifier 4 Pro XM200039 has a child lock; the average air purifier does not.
Supports voice control
Xiaomi Smart Air Purifier 4 Pro XM200039 supports voice control; the average air purifier does not.
Has an ionizer
Xiaomi Smart Air Purifier 4 Pro XM200039 has an ionizer; the average air purifier does not.
Supports delayed start
Xiaomi Smart Air Purifier 4 Pro XM200039 supports delayed start; the average air purifier does not.

Why is Xiaomi Smart Air Purifier 4 Pro XM200039 worse than the average air purifier?

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11 dB higher maximum noise level
Xiaomi Smart Air Purifier 4 Pro XM200039 runs louder at maximum speed than the average air purifier (64 dB vs 53 dB).
Lower Manufacturer warranty
Xiaomi Smart Air Purifier 4 Pro XM200039 offers lower Manufacturer warranty than the average air purifier (1 years vs $$$).
4.5 W lower power
Xiaomi Smart Air Purifier 4 Pro XM200039 has a lower power output than the average air purifier (33 W vs 37.5 W).
48.8% higher weight
Xiaomi Smart Air Purifier 4 Pro XM200039 is heavier than the average air purifier (6.8 kg vs 4.57 kg).
5.5 cm greater depth
Xiaomi Smart Air Purifier 4 Pro XM200039 is deeper than the average air purifier (27.5 cm vs 22 cm).
18 cm taller height
Xiaomi Smart Air Purifier 4 Pro XM200039 is taller than the average air purifier (68 cm vs 50 cm).
0.3 m shorter power cord
Xiaomi Smart Air Purifier 4 Pro XM200039 features a shorter power cord than the average air purifier (1.5 m vs 1.8 m).
20167.98 cm³ larger external volume
Xiaomi Smart Air Purifier 4 Pro XM200039 has a larger overall volume than the average air purifier (51425 cm³ vs 31257.025 cm³).
0.2 cm wider width
Xiaomi Smart Air Purifier 4 Pro XM200039 is wider than the average air purifier (27.5 cm vs 27.3 cm).
11 dB higher maximum noise level
Xiaomi Smart Air Purifier 4 Pro XM200039 runs louder at maximum speed than the average air purifier (64 dB vs 53 dB).
What it is: The sound level emitted by the air purifier when running at its highest fan speed, measured in decibels (dB).
When it matters: Important if you plan to use the purifier in bedrooms, nurseries, or home offices where loud fan noise causes disturbance.
Importance: HIGH
Xiaomi Smart Air Purifier 4 Pro XM200039 runs louder at maximum speed than the average air purifier (64 dB vs 53 dB).64 dB vs 53 dB
Lower Manufacturer warranty
Xiaomi Smart Air Purifier 4 Pro XM200039 offers lower Manufacturer warranty than the average air purifier (1 years vs $$$).
What it is: This attribute shows the air purifier's manufacturer warranty.
When it matters: It matters if longer manufacturer coverage is important to you.
Importance: MEDIUM
Xiaomi Smart Air Purifier 4 Pro XM200039 offers lower Manufacturer warranty than the average air purifier (1 years vs $$$).1 years vs 2 years
48.8% higher weight
Xiaomi Smart Air Purifier 4 Pro XM200039 is heavier than the average air purifier (6.8 kg vs 4.57 kg).
What it is: The total physical net weight of the air purifier without packaging, measured in kilograms (kg).
When it matters: Important if you frequently carry the purifier between rooms, to different floors, or place it on furniture.
Importance: MEDIUM
Xiaomi Smart Air Purifier 4 Pro XM200039 is heavier than the average air purifier (6.8 kg vs 4.57 kg).6.8 kg vs 4.57 kg
5.5 cm greater depth
Xiaomi Smart Air Purifier 4 Pro XM200039 is deeper than the average air purifier (27.5 cm vs 22 cm).
What it is: The front-to-back depth measurement of the air purifier, in centimetres (cm).
When it matters: Determines how far the purifier protrudes outward into walkways or away from walls.
Importance: LOW
Xiaomi Smart Air Purifier 4 Pro XM200039 is deeper than the average air purifier (27.5 cm vs 22 cm).27.5 cm vs 22 cm
18 cm taller height
Xiaomi Smart Air Purifier 4 Pro XM200039 is taller than the average air purifier (68 cm vs 50 cm).
What it is: The vertical height of the air purifier unit, measured in centimetres (cm).
When it matters: Important for ensuring the unit fits underneath tables, under low window sills, or onto designated shelves.
Importance: LOW
Xiaomi Smart Air Purifier 4 Pro XM200039 is taller than the average air purifier (68 cm vs 50 cm).68 cm vs 50 cm
0.3 m shorter power cord
Xiaomi Smart Air Purifier 4 Pro XM200039 features a shorter power cord than the average air purifier (1.5 m vs 1.8 m).
What it is: The total physical reach of the supplied electrical power cord, measured in metres (m).
When it matters: Determines optimal placement flexibility relative to wall power outlets without needing extension cables.
Importance: LOW
Xiaomi Smart Air Purifier 4 Pro XM200039 features a shorter power cord than the average air purifier (1.5 m vs 1.8 m).1.5 m vs 1.8 m
4.5 W lower power
Xiaomi Smart Air Purifier 4 Pro XM200039 has a lower power output than the average air purifier (33 W vs 37.5 W).
What it is: The electrical power consumption of the air purifier during operation, measured in watts (W).
When it matters: Helpful for estimating long-term electricity costs, particularly when running the unit continuously day and night.
Importance: HIGH
Xiaomi Smart Air Purifier 4 Pro XM200039 has a lower power output than the average air purifier (33 W vs 37.5 W).33 W vs 37.5 W
50% more expensive
Xiaomi Smart Air Purifier 4 Pro XM200039 is more expensive than the average air purifier (£210 vs £140).
Xiaomi Smart Air Purifier 4 Pro XM200039 is more expensive than the average air purifier (£210 vs £140).£210 vs £140

Graphic comparison of Xiaomi Smart Air Purifier 4 Pro XM200039 and other products in the Air Purifiers category

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Third-party reviews

United Kingdom

(Reviews last updated: August 2026)

What customers like about Xiaomi Smart Air Purifier 4 Pro XM200039?

Excellent air cleaning performance with a high Clean Air Delivery Rate (CADR) for particles and formaldehyde.
Very quiet operation on lower settings, making it highly suitable for bedrooms and night use.
Highly cost-effective with low energy consumption and affordable replacement filters compared to competitors.
Equipped with comprehensive PM2.5, PM10, temperature, and humidity sensors.
Clear, built-in OLED touch screen that provides color-coded air quality indicators at a glance.
Strong smart home integration with intuitive Mi Home app scheduling and AI voice controls.

What customers dislike about Xiaomi Smart Air Purifier 4 Pro XM200039?

The negative air ionization feature can only be completely disabled through the companion smartphone app.
Some users report a noticeable high-pitched whining noise from the fan motor when operating on low speeds or auto mode.
Overall purification performance is noticeably affected if the ionizer is not utilized.

Expert reviews

housefresh.com

17/12/2025

Summary of the review

Xiaomi Smart Air Purifier 4 Pro review - HouseFresh

According to a HouseFresh review, the Xiaomi Smart Air Purifier 4 Pro is a high-performing, cost-effective unit featuring substantial activated carbon, an informative OLED display, and low energy consumption. While highly efficient, the unit's drawbacks include a high-pitched whining noise at low speeds and a negative ionizer that can only be disabled via the companion app.

mightygadget.com

16/07/2026

Summary of the review

Xiaomi Smart Air Purifier 4 Pro Review vs Philips Series 3000i

The Mighty Gadget review finds the Xiaomi Smart Air Purifier 4 Pro a high-value alternative to the Philips 3000i, offering a robust 500m³/h CADR, quieter operation at high speeds, and cheaper filters. While delivering strong performance, the device features a less sensitive pollution detector, requires the Mi Home app to disable the ionizer, and may produce a high-pitched whine at lower speeds.

ximitime.com

10/11/2025

Summary of the review

I used the Xiaomi Smart Air Purifier 4 Pro for 30 days - XimiTime

A 30-day review by XimiTime found the Xiaomi Smart Air Purifier 4 Pro highly effective at removing odors, dust, and allergies, boasting a 500 m³/h CADR for quick, large-room cleaning. The purifier features a certified 3-in-1 filter and precise sensors, though it cannot eliminate settled dust and relies on the Mi Home app for features like screen brightness control.

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