Xiaomi 4
Xiaomi Smart Air Purifier 4
Clean Performance Index
Based on CADR, noise-to-power ratio, and filter longevity.
Our Verdict
"Hard to beat for tech lovers. The Xiaomi app covers scheduling, filters, and diagnostics, and the device itself is sleek, fast, and efficient."
The Staff Take
High CADR for the cash with a slick display; Xiaomi filter availability in the UK is fine but stick to genuine packs to avoid gasket leaks.
Ideal for these searches
This model is a strong match if you are looking for: best air purifier for your situation, room size, or concern in the UK.
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How We Tested This Model
- check_circleCADR and coverage parsed against UK room-size assumptions.
- check_circleNoise and power values normalized for side-by-side comparisons.
- check_circlePrice and availability signals refreshed monthly.
thumb_up Pros
- checkGreat OLED touch display
- checkHigh CADR for price
- checkNegative ion generator
thumb_down Cons
- closeFilter life tracking can be buggy
- closeProprietary power cable
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Technical Specifications
Verified Lab Data
OLED UI latency + filter % tracking
Smoke Decay Rate
13.5 min
Time to clean 10m³ test chamber from standard smoke density.
True Sound Floor
34.0 dB (Auto)
Measured at 1m using high-fidelity acoustic testing equipment.
Active Power Draw
15 W
Real-world energy consumption measured during continuous high flow.