ngươi Air Purifier 2

The smart way lớn breathe Real-time AQI monitoring
Mi trang chủ app, smart remote controls400 sq. Ft. Coverage, 360° triple-layer filter

Clean each breath of air Purifies room in 10 minutes①

We know eating clean is better for the body, & the same applies to lớn the air we breathe. Ngươi Air Purifier 2 is simple, elegant và has a new compact kiến thiết that is 40% smaller than the first ngươi Air Purifier. Despite this, it still offers a high 310m3/h Clean Air Delivery Rate (CADR) ② và takes just 10 minutes khổng lồ circulate purified air in a 21m2 room. Go on, isn"t it about time you give your lungs a treat?

Every way the wind blows High air pressure, larger circulation

Send powerful gusts of air to lớn the farthest reaches of your room. Inspired by aircraft engines, the aerodynamic pressure system created by our R&D team draws inward from the base và expels air upwards with great force. Smartphone controls let you switch on và off remotely, even when you are away from home③. That way you can always be sure to come home to clean air.

More about Purification >

Covers all angles 360°triple-layer filter

The 360° cylindrical filter takes in air more efficiently from every direction compared khổng lồ conventional air purifiers. Its triple-layer thiết kế removes particles larger than 0.3μm with a high-density EPA filter from Japanese manufacturer Toray, while an activated coconut carbon filter removes formaldehyde, bad odour and other harmful substances.④ Replacing the filter is simple và you will be automatically notified via the phầm mềm when it needs replacing

More about Filter >

11min khổng lồ circulate air once in the living room

Enjoy better air even when resting on the sofa. Mày Air Purifier 2 quickly removes PM2.5 particles, dust from unclean air conditioners, germs, indoor plant pollen & pet hair. It even filters unpleasant odours that may waft through from time to time.

8min to lớn circulate air once in the master bedroom

Your body toàn thân and its respiratory system releases carbon dioxide, ammonia, & other chemicals. Without proper air circulation, sleep chất lượng can be greatly affected. The ultra-quiet mi Air Purifier also removes PM2.5 particles, bacteria, dust và other allegens that cling onto bedding. This can provide relief to headaches, sore throats, and stuffy noses, and other sleep discomforts.

4min to circulate air once in the kid"s room

Babies are most sensitive to germs, allergens và dust. Give your baby the best air possible with mi Air Purifier. No matter which room your baby is in, let clean air be that invisibile shield that protects your child as he or she grows up.

5min to lớn circulate air once in the study

Sitting in your newly renovated study? mày Air Purifier 2 filters out formaldehyde, chemical contaminants & smoke. Clear your senses with a steady stream of clean air lớn better focus on work or reading.

Completely in control Monitor air chất lượng at a glance

Use your phone as a remote lớn power on, power nguồn off, and switch modes. The Mi trang chủ app also lets you monitor home air chất lượng from your phone at any time. Create schedules lớn power on, nguồn off, switch lớn Night mode, và more.

More about Smart Controls >

The strong, silent type Ultra-quiet & energy efficient

Sleep soundly with the ultra-quiet ngươi Air Purifier 2. Advanced aerodynamics reduce noise & wind resistance so you can enjoy peace & silence at night. The custom Japanese motor from Nidec is extremely nguồn efficient, consuming 58% less energy than mày Air Purifier & using only 4.8W on normal mode - that"s even better than energy-saving lightbulbs.⑥

Learn about Purification > mi Air Purifier 2 circulates clean air indoors with a pressure system that propels air to every corner of the room.

CADR (Clean Air Delivery Rate) is the international standard for measuring air purifier effectiveness. Ngươi Air Purifier 2"s CADR is measured under specified test & capacity conditions with targeted pollutants (particulate and gaseous) with measurement units in cubic meters per hour (m3/h).

Results according lớn Guangzhou Industrial Microbiology Testing Centre"s CADR thử nghiệm report. Takes 10min khổng lồ circulate clean air in a 21m2 room, 2.4m high. CADR is affected by room area & height. Mi Air Purifier 2"s effective area is based on the GB/T 18801 Air Purifier standard: Effective area=CADR x (0.07-0.12). Data taken from Guangzhou Industrial Microbiology Testing Centre"s CADR chạy thử report. Install the Mi home app to lớn control mi Air Purifier 2 remotely. Noise levels on High-speed mode will be higher than Normal or Night mode. Toray EPA filter removes extremely fine particles and contaminants including airborne allergens (pollen, dust mites, pet dander, mold, etc.) as well as bacteria & some viruses. Results according khổng lồ Guangzhou Industrial Microbiology Testing Centre"s CADR demo report. mày Air Purifier 2 uses 58% less energy than ngươi Air Purifier when both devices are on High-speed mode. 4.8W nguồn consumption takes place when in Normal mode. Appearance details may vary slightly with different production batches, & may be subject to lớn change without prior notice.

Above data may vary based on different environmental conditions.

Bạn đang xem: New xiaomi mi air purifier 2s for formaldehyde cleaning

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Ever since I coughed through a Beijing airpocalypse, I’ve been saying clean air doesn’t need khổng lồ cost an arm and a leg. I even set up Smart Air lớn provide low-cost purifiers lớn people around the world based on that data.

So when the xiaomi 2 air purifier came out for under $150 (10,000INR / 1,000RMB), I assumed it works just fine. But I had never gotten around lớn testing it—until now. & what I found testing the Xiaomi mi 2 shocked me.

Xiaomi mi 2 Air Purifier: Put to lớn the Test

Smart Air co-founder Anna ran a brand new Xiaomi mi 2 air purifier in the 15m2 Smart Air test bedroom where we’ve tested the DIYs, IQ Air, xanh Air, và Philips. Anna ran six tests on tự động mode và six tests on the highest setting (which the xiaomi 2 air purifier oddly calls “Favorite mode”).


Anna turned the purifier on in the morning when she left home, và turned it off when she returned home. That means there was no one in the home during the tests. The doors và windows were closed during the tests. (More details on the test method & all original data are here.)

A Dylos Pro tracked ≥ 0.5 micron & ≥ 2.5 micron particle counts during the test. Kiểm tra data shows these 0.5 micron readings correlate highly with the US Embassy’s PM2.5 readings (r = .90).

As in my earlier tests, I calculated effectiveness as (the number of particles before turning the purifier on) versus (the average number of particles over the last four hours).

Xiaomi 2 Air Purifier test Results

The xiaomi mi purifier scored as one of the worst purifiers I’ve ever reviewed. On average, it removed only about 60% of 0.5 micron particles over the last 4 hours of the test.


And oddly enough, the auto mode and the high mode results of the ngươi 2 purifier were nearly identical. That’s a mystery.

Here’s how the xiaomi results compare khổng lồ earlier results from other purifiers using the same method, same particle counter, in the same room.


The data shows the mi air purifier performed worse than the $30DIY purifier I’ve been showing people how khổng lồ make for years!

Below is a normal demo day. I put a dashed red line representing the World Health Organization’s 24-hour PM2.5 limit (25 micrograms).


The Xiaomi mày Air Purifier Really Wants khổng lồ Be in tự động hóa Mode

What’s wrong? The key is that—even on the highest setting—the xiaomi mi reverts back to auto mode after 3 hours..

WATCH: mi Reverts to auto Mode After 3 Hours


To be sure this is what the machine was doing, we put the xiaomi on the highest setting & tracked noise levels overnight from the Smart Air Lab.

Xem thêm: Top 15 Cách Tết Tóc Đẹp, Xinh Lung Linh Lại Cực Đơn Giản, Hướng Dẫn Kiểu Tết Tóc Dễ Thương (2)


You can see the noise remaining high for three hours, then it returns lớn the ups and downs of tự động hóa mode:


Here is the same graph with particle counts (measured by the Dylos). The particle counts rise sharply every time the machine turns off.


The data shows that xiaomi has a loose standard for “safe.” The mi is turning off when PM2.5 reaches 40 micrograms, which is far higher than even the WHO’s 24 hour limit. And it’s far higher than levels where we know PM2.5 has serious health effects from empirical research. Then it turns on again when PM2.5 gets up lớn 70 micrograms—almost three times the limit.

Really? The xiaomi air purifier won’t stay on high?

The fact that the xiaomi mi air purifier can’t be kept on continuously all night is so strange that Anna asked xiaomi customer service over at She asked twice to make sure we’re not making a mistake. They confirmed that, no matter what, the machine will go back to tự động mode after three hours. (full transcript available in the supplemental materials).

Learn more: the tự động mode is controlled by the inaccurate air unique monitor in the mi 2 air purifier.


How often is the air unsafe with a ngươi Air Purifier?

I calculated the percent of hours that the air was unsafe for the mi air purifier during the tests using this rule:

After the purifier was on for at least 1 hour, for any hour where outdoor air pollution was unsafe (> 25 micrograms – the WHO 24-hour limit), how many hours was indoor air also unsafe (>25 micrograms)?

The Xiaomi mi air purifier left air unsafe for a shocking 86% of the time. The other similarly sized machines in my earlier tests left air unsafe only 7-16% of the time.

Read more: Is Xiaomi ngươi Air Purifier 3H auto Mode Effective?


Maybe the xiaomi mi Mi2’s tự động mode is using the looser Chinese standard for clean air of 35 micrograms. Yet even with that high number, it was still above the limit 77% of the hours the xiaomi Mi2 was running.

Wait, are you sure?

I wanted to lớn be really careful about this review. I’ve seen other tests showing that the xiaomi 1 air purifier works just fine, including these tests from Dr. Saint Cyr (although I’ve seen people write about flaws too, such as this guy who kept the filters wrapped in plastic, turned it on turbo mode, và the tiện ích told him his air got miraculously cleaner). So I double và tripled checked the data:

We tested with a different particle counter in a different room.I re-analyzed the data throwing out any days with large fluctuations in outdoor air.I analyzed days when outdoor pollution was low khổng lồ average (I compared it lớn other tests done just two weeks before in the exact same room with the exact same particle counter.

None of these analyses changed the result (see details here).

Bottom Line: Performances of xiaomi mi Mi2

From this data, my conclusion is that the fan hâm mộ and the filter are fine, but the mi air purifier has a programming flaw. Even if I use it on the highest setting, I’ll be breathing air far above the safe limit for most of the night. That’s a problem.

Is it just a mi Purifier Problem?

To be fair, I cannot recommend any tự động mode I’ve tested. I’ve tested the Philips AC4072 on tự động mode, and it averaged 59% reductions in 0.5 micron particles, which is pretty close to the xiaomi results. So I think this is more of a problem with tự động hóa modes rather than the xiaomi mi specifically.


Yet I can still recommend the Philips. Why? It can stay in medium or high as long as you want, & test data shows it works fine all night as long as it’s not on tự động hóa mode.

I’m confident that xiaomi can fix this flaw by simply allowing people to run it on high without reverting back to auto mode. But until that happens, I cannot recommend using the Mi2.

Open Data

As always, I’m publishing more details on the test method và the original data for fellow nerds.

Review Update: July 2018Some users have reported that they are able lớn get their xiaomi mi air purifier lớn remain in ‘high’ mode using the ‘automation’ feature of the app. For more information, check out this bình luận by Ryan, và this image showing how to set up auto mode. Breathe safe!