Xiaomi Smart Air Purifier 4 Review (2026): Fast, Powerful & Smart — But Is It Worth It?

If you live in a city where dust, smoke, and PM2.5 spikes are normal (Delhi NCR, Lucknow, Kanpur, Patna, Kolkata, Mumbai, etc.), an air purifier is no longer a “nice-to-have.” The bigger question is: which purifier actually gives real results, without becoming noisy, expensive to maintain, or just another gadget sitting in the corner?

The Xiaomi Smart Air Purifier 4 is one of the most popular choices in this segment because it offers a high CADR (387 m³/hr), large coverage up to 516 sq ft, and smart controls (Alexa + Google Assistant). On paper, it looks like the perfect “set it and forget it” purifier for Indian homes.

But in this review, we’ll go beyond specs and talk about real-life performance, who it suits, who should avoid it, maintenance cost, electricity usage, and mistakes buyers make.

Quick Verdict (2 Lines)

✅ Best for: Medium-to-large rooms (up to ~500 sq ft), buyers who want fast purification + smart controls.
⚠️ Not for: People who want “zero-maintenance” ownership or who keep windows/doors open all day.

Comparison Table (Xiaomi Purifier 4 vs Key Alternatives)

Model	Coverage (claimed)	CADR	Smart features	Best for	Biggest drawback
Xiaomi Smart Air Purifier 4	Up to 516 sq ft	387 m³/hr	Alexa + Google Assistant	Fast purification for bigger rooms	Filter cost over time
Philips AC1711	Up to 380 sq ft	~300 m³/hr	No app	Quiet + reliable bedrooms	No smart control
Xiaomi Air Purifier 4 Lite	Similar range	~360–400 (varies)	App smart control	Value buyers	Lower premium feel (vs Purifier 4)
Honeywell / similar H13 models	400–500 sq ft	varies	Usually no voice	Strong filtration	Bulkier + sometimes noisier

What this tells us: If your room is near 450–520 sq ft, Xiaomi Purifier 4 makes more sense than Philips AC1711, mainly due to higher coverage/CADR.

What Xiaomi Smart Air Purifier 4 Is Designed For (Use Cases)

This purifier is built for people who need:

fast PM2.5 reduction after outdoor air comes in (door opened, cooking, nearby smoke, winter smog)
relief from dust, pet hair, and pollen issues
a purifier that can run quietly for long hours
smart home convenience (voice control, scheduling)

Xiaomi’s official product info highlights particle CADR up to ~400 m³/h and coverage area up to 516 sq ft.

Key Specs That Actually Matter

1) High CADR = Faster Cleaning

The biggest strength here is CADR: 387 m³/hr (your listing value). High CADR matters because it decides how quickly your room air gets cleaned.

If you’ve used older/lower-CADR purifiers, you’ll notice the difference in:

faster AQI reduction
quicker “fresh air” feel
better effectiveness in larger rooms

Xiaomi also claims it can purify a ~215 sq ft room in about 10 minutes under ideal conditions.

2) Coverage Up to 516 Sq Ft

This makes it suitable for:

larger bedrooms
living rooms (closed type)
combined bedroom + study areas

But don’t treat coverage numbers as magic. If your room is an open hall with constant ventilation, the purifier will still help—but results won’t feel dramatic.

3) True HEPA Filtration + Allergy Certifications

The listing mentions True HEPA and allergy-related certifications such as RoHS & Allergy Care. These certifications matter for buyers specifically dealing with:

sneezing in mornings
pollen triggers
pet dander
dust sensitivity

(Important note: allergy benefits depend heavily on continuous use + closed room setup.)

4) Low Power Consumption (Very Underrated Benefit)

According to Xiaomi’s official specs page for the India model, rated power is around 30W and standby power is <2W.

This is excellent because air purifiers should ideally run for long hours daily.

Real-World Performance: What You’ll Actually Notice

✅ What it improves quickly

PM2.5 spikes (especially after opening doors/windows)
dust movement in air
comfort in polluted seasons
“stuffy room” feeling

⚠️ What it won’t solve alone

smoke smell coming continuously from outside
gas/VOC heavy environments (strong paint thinner smell etc.)
mold or humidity problems

Tip: Air purifier ≠ ventilation replacement. For best results, keep the room closed and use it consistently.

Smart Features: Alexa + Google Assistant

Smart controls are genuinely useful for an air purifier, because you tend to run it long hours.

Voice control helps when:

you’re about to sleep and want “Sleep mode”
you want to switch to Turbo quickly
you want to schedule it daily

If you already use Alexa/Google Assistant at home, this becomes a strong advantage over “manual-only” purifiers.

Electricity Cost Breakdown:

Let’s simplify this clearly.

Rated power: ~30W
If run for 24 hours: 0.03 kW × 24 = 0.72 units/day
If run 12 hours/day: 0.36 units/day

So even with long daily use, it’s typically not “expensive to run” compared to many appliances.

This matches the typical low-power design Xiaomi promotes for this series.

✅ This is why Purifier 4 is suitable for continuous operation, which is how air purifiers work best.

Maintenance (Hidden Cost Most Buyers Ignore)

What you need to maintain

Pre-filter cleaning

Do it every 2–4 weeks (more often with pets/Delhi dust)
This keeps airflow strong and improves filter life

HEPA filter replacement

Typically 6–12 months depending on pollution and usage
In heavy pollution, replacement can come earlier

General expert advice also supports replacing HEPA filters in the 6–12 month range, depending on use and environment.

Sensor cleaning
Xiaomi provides guidance on cleaning the laser particle sensor area for accurate readings.

✅ Practical suggestion: mark the filter install date on your calendar. This small habit prevents performance drop.

Mistakes to Avoid:

If you buy an air purifier, avoid these common mistakes:

❌ Mistake 1: Buying based only on coverage number

If your hall is 500 sq ft but open to kitchen + dining, treat it like a bigger space. Air purifiers perform best in enclosed rooms.

❌ Mistake 2: Keeping it behind curtains/sofa

Purifiers need good airflow on all sides. Place it 1–2 feet away from walls.

❌ Mistake 3: Running it only 20 minutes/day

Air pollution isn’t a one-time event. For consistent benefits, use it in Auto mode for long hours.

❌ Mistake 4: Ignoring filter costs

Even the best purifier becomes useless with clogged filters. Always budget for replacements.

❌ Mistake 5: Washing the HEPA filter

Most HEPA filters are not washable. Clean only pre-filters as recommended.

Pros & Cons:

✅ Pros

High CADR (fast purification)
Covers bigger rooms (up to ~516 sq ft)
Smart controls (Alexa/Google Assistant)
Low power usage (good for long runtime)
Strong for dust + PM2.5 seasons

❌ Cons

Filter replacement cost is unavoidable
Best performance requires closed room usage
VOC/chemical smell monitoring isn’t the primary strength
If you don’t care about smart controls, cheaper models may feel “good enough”

Who Should Buy Xiaomi Smart Air Purifier 4?

You should buy it if:

your room is 350–520 sq ft
you want fast cleaning (high CADR matters)
you want smart + voice control convenience
you’ll use it daily for long hours

Who Should Avoid It?

Skip this model if:

your room is small (below ~250 sq ft) and you want cheaper options
you dislike ongoing maintenance costs
you expect purifier to work with windows open all day

FAQs:

1) Is Xiaomi Smart Air Purifier 4 good for Delhi pollution?

Yes, it can significantly improve indoor air quality, especially in closed rooms during smog/dust seasons.

2) Can it remove virus particles?

It claims very high trapping efficiency and virus trapping, but don’t treat it as a medical device substitute. It’s best viewed as air cleaning support.

3) How long should I run it daily?

Ideally 8–16 hours/day. Many users run it almost continuously in Auto + Sleep mode.

4) Is it noisy at night?

It’s designed for quiet operation in Sleep mode, making it suitable for bedrooms.

5) Does it work in an open living room?

It will help, but results will be weaker than in a closed room. For open halls, higher CADR models perform better.

6) How often should the filter be changed?

Typically 6–12 months depending on pollution, pets, usage hours, and maintenance.

7) Can I wash the HEPA filter?

Generally no. You can clean the pre-filter, but HEPA filters are typically replaced, not washed.

8) Does it support Alexa and Google Assistant?

Yes, this is one of its key highlights.

9) What is CADR and why does it matter?

CADR tells how quickly the purifier can supply clean air. Higher CADR = faster room cleaning.

10) Does it reduce cooking smell?

To some extent due to activated carbon layer, but strong cooking smells need ventilation too.

Final Verdict (Unbiased)

The Xiaomi Smart Air Purifier 4 is one of the most sensible air purifier choices for Indian homes that need fast and noticeable purification for medium-to-large rooms. Its high CADR, solid coverage, and smart voice control make it feel modern and convenient—not just functional.

That said, it’s not a one-time purchase like a fan. To keep performance strong, you must plan for filter replacement and periodic cleaning. If you’re okay with that, this purifier offers excellent value and strong real-world improvement in indoor comfort.

Buy Xiaomi Smart Air Purifier 4 (Amazon)

👉 Xiaomi Smart Air Purifier 4 (387 m³/hr CADR, True HEPA, 516 sq ft Coverage, Alexa & GA) at the cheapest and lowest price with bank offers, if you compare with similar products and sites.

Xiaomi Smart Air Purifier 4 For Upto 516 SqFt Area Unbiased Review & Buying Guide