Xiaomi Smart Air Purifier 4 Lite review: lots of airflow and a good app for ₹11,000, with filter caveats

How we researched this

We have not used this purifier. We read Xiaomi India’s product page and its specification sheet, the Flipkart listing and its owner reviews on 12 November 2026. We could confirm the CADR, coverage, sensors, power and noise ratings Xiaomi publishes. We could not find the replacement filter price or the warranty terms on those pages, and we have not measured airflow, noise or sensor accuracy.

Airflow and coverage

Xiaomi lists a particle CADR of 360 m³/h and a formaldehyde CADR of 120 m³/h, citing tests by a Chinese appliance testing institute to the GB/T 18801-2015 standard. That is near the top of its price bracket: the Philips AC0920 lists 250 m³/h, and the Honeywell Air Touch V5 lists 380 m³/h. Xiaomi says that suits rooms of 25 to 43 m² (269 to 463 sq ft). The Flipkart title’s “640 sq ft” is not Xiaomi’s figure.

The filter: read the small print

Xiaomi’s page is contradictory here. One section calls the filter “True HEPA” with an anti-bacterial coating. Another explains that “Xiaomi’s High Efficiency Filter” combines electrostatic charge with mechanical filtration and contrasts it with a “conventional HEPA filter” made of dense fibreglass. The spec sheet lists 99.97% efficiency, while the overview claims 99.99% of 0.1 µm particles. Xiaomi does not say how efficiency changes as the filter ages. It does list 450,000 mg of activated carbon, 1.8 times the amount in its older 3C model, and a 12-month replacement interval.

Sensors and smart features

This is the 4 Lite’s strength. A laser particle sensor reports PM2.5, and there are temperature and humidity sensors too. Readings show on the round display and in the Xiaomi Home app, which also offers schedules and remote control. It works with Alexa and Google Assistant, has a child lock, and uses a brushless DC motor rated at 33 W.

Noise

Xiaomi quotes 33.4 dB(A) in night mode, but its spec sheet also lists noise up to 61 dB(A). At high speed it will be clearly audible.

What owners report

Flipkart shows 4.4 stars from 2,703 ratings: 1,798 five-star and 156 one-star (about 6%). Negative reviews say the room AQI stayed between 150 and 200 despite hours of running, that the unit started humming after nine days, that the app showed 40% filter life on day one, and that the warranty is carry-in rather than a home visit. One owner says the display stayed green while a smell remained.

Should you buy it?

For a living room or large bedroom, and for anyone who wants app and voice control, the 4 Lite offers a lot on paper for about ₹11,000. Budget for a yearly filter, and expect noise at full speed. If you want a conventional mechanical HEPA filter, look at Philips or Honeywell instead. Our score is provisional until we test it.