Xiaomi Mi Air Purifier 4 Review: Should You Choose This Over Dyson and Philips?

I’ll be honest about why I bought this. We live in a third floor flat in a busy part of the city main road below, construction happening two buildings away for the past year. By evening the dust in our living room is visible in sunlight. My daughter started getting frequent sneezing fits and mild throat irritation last winter. The doctor said nothing serious but suggested we think about air quality at home. That’s what pushed me to finally look at purifiers seriously.

After about two weeks of research I ordered the Xiaomi Smart Air Purifier 4. Been using it for about four months now. Here’s everything I actually noticed.

Setup and First Use

Box contains the purifier, the filter already installed inside, a power cable and a manual. Setup took maybe ten minutes. Plug it in, download the Mi Home app, connect to your WiFi, done. The app walked me through the setup without any confusion. First time I turned it on in auto mode I watched the PM2.5 reading on the display drop from 68 to 19 in about twelve minutes. That was in our living room with windows closed. That first session alone made me feel the purchase was justified.

The matte white body looks clean and modern. It doesn’t look like medical equipment the way some purifiers do. Sits in the corner of our living room and honestly looks like it belongs there. The 360 degree intake vents around the base mean you don’t need to position it against a wall in any particular direction.

Air Quality Improvement What We Actually Experienced

The most convincing proof for me came about three weeks after buying it. We had a particularly bad dust day winds were high, construction nearby was intense, and the air outside looked visibly hazy. Kept the purifier running on auto all day. My daughter had zero sneezing episodes that evening. The previous week on a similar day she’d gone through half a box of tissues.

I can’t obviously attribute everything to the purifier but the pattern has been consistent. On days when it runs all day the air inside feels noticeably different easier to breathe, no dusty smell, no that dry scratchy feeling at the back of the throat you sometimes get when pollution is bad outside.

The PM2.5 sensor and display give you real numbers rather than just a colour light. I’ve found myself actually looking at it regularly checking levels when cooking, when we open windows in the evening, after vacuuming. It’s become a small habit.

Noise Running It Through the Night

We moved it to the bedroom after the first two weeks because that’s where we wanted it running overnight. In sleep mode it’s barely audible a very gentle, constant white noise that I actually find easier to sleep with than complete silence. My wife who is sensitive to sound had no complaints which was the real test.

On auto mode during the day when it kicks up to medium or high speed there’s a clear fan sound but nothing jarring. On full turbo which I’ve only run a couple of times to clear the air quickly after cooking something smoky it’s noticeably loud. But that’s a short burst, not something you’d run continuously.

64 dB at maximum is the spec and that matches what I experience. Normal operating levels are much lower than that.

App and Smart Features Used Daily

The Mi Home app is genuinely useful, not just a box-ticking feature. Every morning I check the AQI reading from bed before deciding whether to open windows. I schedule it to turn on at full auto thirty minutes before we wake up so the bedroom air is already clean when we start the day. Set it to sleep mode automatically at 10pm.

The filter life tracker is helpful shows percentage remaining so you know well in advance when replacement is coming rather than guessing. Currently at around 71% after four months of heavy use.

Google Assistant works for basic voice commands turning on, switching modes, asking air quality. I use it occasionally when my hands are busy in the kitchen. Nothing groundbreaking but it works.

Filter and Maintenance Simpler Than Expected

Haven’t needed to replace the filter yet. At current usage patterns I expect it will last another four to five months before replacement is needed. Replacement filters online cost around ₹1,800 to ₹2,200 depending on where you buy that’s the annual running cost alongside electricity, which is minimal.

Changing the filter when the time comes is literally opening the back panel, pulling the old one out, putting the new one in and closing it. No tools, no technician, takes two minutes. I’ve done a dry run just to see how it works and it couldn’t be simpler.

Dyson replacement filters cost significantly more I’ve seen prices that made me wince. For a device you’re running daily, that long-term cost difference matters.

Compared to Dyson and Philips

I looked hard at both before buying. A Dyson purifier fan was about three times the price of this Xiaomi. The Philips options I compared were around 40 to 60 percent more expensive for similar coverage area.

Dyson’s purification is technically superior and the dual functionality as a fan adds value. If budget isn’t a constraint it’s a genuinely impressive product. But at nearly three times the price for a family buying their first purifier, the value equation just doesn’t hold up for most people. Philips is solid but nothing about the features or performance at its price point convinced me it was worth the extra cost over this Xiaomi.

What Xiaomi gives you 400 m³/h CADR, decent coverage for most Indian rooms, reliable smart features, quiet operation, low running cost covers everything a household actually needs. If this were delivering 60 or 70 percent of what a Dyson does the comparison might feel uncomfortable. But it genuinely gets you close enough that the gap doesn’t feel worth the price difference for everyday home use.

Coverage and Room Size

Our living room is about 180 square feet and the purifier handles it comfortably on auto. Bedroom is smaller and it works even better there. The spec says 28 to 48 square metres at the lower end of that range you’ll notice faster and more thorough purification, at the higher end it still works but takes a bit longer to cycle through all the air.

For very large open-plan spaces a single unit would struggle. But for a typical Indian flat where rooms are individual enclosed spaces, one unit per main room is completely effective.

Price What Makes Sense

Between ₹18,000 and ₹22,000 on Amazon and Flipkart. Prices fluctuate slightly during sales I bought mine during a discount and paid toward the lower end of that range. Add roughly ₹2,000 annually for filter replacements. That’s the total cost of ownership.

If a seller quotes above ₹22,000 for the standard model without any bundle, compare prices on the major platforms before buying.

Four Months In Honest Summary

My daughter’s sneezing fits have reduced significantly. The indoor air feels different and measurably cleaner. The app is genuinely useful rather than just a feature list item. Running cost is low. Setup was simple. Maintenance is simple.

For a family in an Indian city dealing with pollution, dust, construction nearby, or anyone with mild respiratory sensitivity this purifier does what it promises at a price that makes sense. Four months in and I’d buy it again without hesitation.

Xiaomi Smart Air Purifier 4 Full Specifications

Questions about room size suitability or specific use cases drop them in the comments and I’ll answer from actual experience.