Comparing Mi Air Purifier 2s, 3, F1, Pro, Pro H and MAX

Xiaomi Air Purifier 2s

The Xiaomi Mi Air Purifier 2s can be said to be an upgrade of the Mi Air Purifier 2, it isn’t superior to the Mi Air Purifier Pro, but it adds some of the features of the Pro version.

The product retains Mi air purifier 2 filter and with a Clean Air Delivery Rate (CADR) value of310m³/h, added Pro version features like laser particle sensor and OLED display that enable to shows real-time PM2.5 values. Compared with infrared Sensors features in its predecessor, Xiaomi air purifier 2s version improved a lot on detection accuracy, besides showing PM2.5 values, it can also detect particles as small as 0.3μm in size.

The most significant difference between this two model is 2s version added an OLED display, while at the same time other features have also been greatly upgraded. The OLED accurately shows atmospheric particulate matter (PM) that have a diameter of less than 2.5 micrometres, which is about 3% the diameter of a human hair (PM2.5 concentration) as well as temperature and humidity. It also comes with a WIFi connection and the work patterns so that you’ll be abreast with changes in the air quality. It has a laser sensor which assists in the accurate detection of particles as small as  0.3μm in size.

In addition, the Xiaomi Air Purifier 2s comes with a built-in light sensor that can automatically sense the ambient light changes in order to automatically adjust the screen brightness accordingly. This ensures the light doesn’t stay too bright at night so as not to disturb your sleep. Further, you get a device with a Clean Air Delivery Rate (CADR) value of 310m³ / h and can cover a room the size of between 21-32 square metres. This is quite lower than that of the second-gen Mi Purifier 2 and Mi Purifier Pro. For clarity, the Purifier 2 has a CADR of 406m3/h and can cover a working area of 48 square metres while the Pro version has a 500m3/h CADR and is also capable of covering an indoor area of 60 square meters.

The Air Purifier 2s also features a more refined three-layer filter that can pick up particles like allergens, animal fur, formaldehyde, dust, pollen and cigarette smoke from the air. The new product also added RFID smart filter identification, simplifying the cumbersome routine reset operation.

Xiaomi Air Purifier 3

In August 2019, Xiaomi released the new air purifier 3 in the same volume as 2 and 2s, it is an upgrade of 2s, and if compared with the 2s, the CADR value increased to 400m/h, PM2.5 purification capacity increased by 29%. 



Mijia Air Purifier 3 is also jointly developed by Mijia and Jimi Technology and has been further iterated and optimized on the basis of previous generations of products. Mijia Air Purifier 3 continues the previous generation of product circular OLED display screen design, can provide indoor air data (temperature, humidity, real-time PM2.5 values), purifier operation status, network connection status and other information. The difference is that the Mijia Air Purifier 3 integrates the keys originally at the top of the fuselage into the OLED display, surrounded by a three-color variable light ring that reflects indoor air quality.

Compared with the previous generation of products, the air passage system of the Mijia air purifier 3 has been redesigned to output more air volume without changing the volume of the fuselage, and 6,660L clean air can be delivered per minute. Xiaomi says this is already the limit of the purification capacity of the same volume tower.

The optimization of the air route system has also increased the particulate CADR value of Mijia Air Purifier 3 by 29% to 400 m / h, and the applicable area has been increased by 11 x to a maximum of 48 m / h.

Although the performance improved, fortunately, the operating noise and power of the Mijia air purifier 3 did not increase with it. The operating noise is as low as the maximum power of 32.1dB (A), operation is only 38W, calculated at the conventional market price, 24 hours a day, the electricity charge does not exceed 0.5yuan.

In other respects, Mijia Air Purifier 3 also integrates the wind speed regulation function of Mijia Air Purifier MAX, with built-in micron laser particle sensor, which can detect micron fine particles and feedback indoor air quality changes in real time.

Mijia air purifier 3 can also be connected to Mijia App and Xiaoai AI voice control system to complete the linkage control with air purifier and smart rice full DC frequency conversion air conditioning, smart rice dehumidifier, smart rice fresh air system and other intelligent environmental electrical equipment.

Note* – AI Smart Voice Control only works in Chinese

Xiaomi Air Purifier PRO

The Mi Air Purifier Pro boasting an increased capacity and coverage, it also is the first in the series to sport an OLED display. The highlight feature of the new and significantly larger Mi Air Purifier is the OLED display, which now shows real-time air quality using the PM2.5 concentration scale for particulate matter, alongside temperature and humidity. An LED ring around the display changes colour from green to red based on the air quality, and the company is also touting an auto brightness feature that will adjust to the time of the day.

As we mentioned, the Mi Air Purifier Pro is significantly larger than the Mi Air Purifier 2, with dimensions of 735x200x260mm. Xiaomi says it is meant to service rooms as large as 60 square metres, compared to the 37 square metres the Mi Air Purifier 2 could handle. It weighs in at 9.7kg.

The Mi Air Purifier Pro has a clean air delivery rate (CADR) value of 500 cubic metres an hour, compared to the 310 cubic metres an hour on the smaller model. It also touting a laser particle sensor for more accurate detection of air quality, capable of spotting particles as small as 0.3 microns in diameter.

It bears a triple layer 360-degree filter on board, with a PET pre-filter, an EPA filter, and an activated carbon filter. As before, the Mi Air Purifier 2 is Wi-Fi enabled, and can be controlled via the Mijia Home app for Android and iOS. The app also lets users share control with family members, and has three modes of operation – auto, night (sleep), and manual. Users can also set timer, and get reminders to change the filter.

The highlight feature of the new and significantly larger Mi Air Purifier is the OLED display, which now shows real-time air quality using the PM2.5 concentration scale for particulate matter, alongside temperature and humidity. An LED ring around the display changes colour from green to red based on the air quality, and the company is also touting an auto brightness feature that will adjust to the time of the day.

Xiaomi Air Purifier MAX

The Mi Air Purifier Max features a design similar to the previous models that have so far been launched by Xiaomi, including the recently launched Mi Air Purifier 2S. It comes with an OLED display having a circular shape and is integrated with the operational design. As a result of its gigantic size, the Mi Air Purifier Max utilises a two-filter design. The design includes a left and right fuselage with a detachable top cover which allows users to replace the filters manually.

The CADR value of up to 1000m³ / h ensures the device can be used to purify the air in a room with an area of 120 square meters in just 3 minutes. Despite the large size, you won’t get bugged by noise as the Mi Air Purifier Max comes with Xiaomi’s patented silent noise reduction technology such that even in the highest mode, the noise is still reduced at just 34dB.

Feature Comparisons of 2S, 3, PRO and MAX

Comparison of the size, from far left, Purifier 2, 2s, Pro and MAX

MAX is huge

All about Air Purifiers and Formaldehyde

We spend majority of our times in-door

Since we spend so much time inside, it is important for us to learn how to reduce or eliminate this dangerous chemical from our homes.

Formaldehyde” is some terms where only scientists and high schoolers dissecting frogs tend to be familiar with the chemical.

What’s the big deal?

Formaldehyde is one of the most common toxic substances found in indoor air. Formaldehyde causes scary health problems like ulcers and cancer, yet it’s common in construction materials and new furniture. The people who should worry the most are people in new or recently renovated homes. Tests of new and renovated homes routinely find high levels of formaldehyde.

Formaldehyde causes cancer and it is pertinent to know more about its removal. You can find this deadly chemical in glues, paints, lacquers and finishes. Formaldehyde is a human carcinogen that is also used in permanent press fabrics and in paper products.

Not every air purifier can remove formaldehyde. In fact, the models you can buy in most department stores won’t have the filters required to remove formaldehyde and other dangerous chemicals.

What exactly is formaldehyde?

Formaldehyde is listed as a probable human carcinogen (cancer causing agent) by the U.S. Environmental Protection Agency. It is a very small molecule, about the size of a single molecule of water. However, even though it is extremely tiny, it packs a big punch. It’s probably best known to the public for its preservative properties – solutions containing formaldehyde have been used to preserve biological specimens and even in embalming.

The reason it is so effective at stopping bacterial growth is the same reason we don’t want it in our air; it is extremely poisonous. The cells in our bodies can be killed by formaldehyde as easily as bacterial or fungal cells are.

Formaldehyde is a colorless, flammable, non-smelling gas that belongs to a group of organic compounds called aldehydes, which are formed by the oxidation of alcohols. Another typical aldehyde is acetaldehyde, a common chemical in the environment that may also be formed in the body from the breakdown of ethanol. Suffering from a hangover? Now you know why.

The reason why people are starting to take notice is that formaldehyde has been linked to cancer over time and sometimes, exposure can lead to immediate health effects. The EPA lists symptoms such as watery eyes, burning sensations in the eyes and throat, nausea, and difficulty in breathing. These effects can often be seen in people who were exposed to elevated levels (above 0.1 parts per million). High concentrations may also trigger attacks in people with asthma. Some individuals may develop a sensitivity to formaldehyde after being exposed to the TVOC over a long time or in high concentrations..

What are the major sources of formaldehyde at home?

As you can see from the graphic above, sources of Formaldehyde Gas are common throughout most homes and can be steadily off-gased from lit cigarettes, storage cabinets made of particle board, subflooring, carpeting, wallboard, electronics, furniture, ceiling and flooring materials, door casings, insulation, household chemical products, and open stoves or heaters – just to name a few man-made sources inside.

Some common products that may contain formaldehyde:

  • Pressed wood products such as furniture and building supplies like particle board, paneling, and fiberboard.
  • Hair care products, especially hair smoothing products     
  • Plastic grocery bags     
  • Cosmetics and skin creams that contain quarternarium-15 (a preservative)     
  • Nail polish     
  • Paint     
  • Permanent-press fabrics/clothing and curtains     
  • Foam insulation (especially urea-formaldehyde foam insulation)     
  • Unventilated Gas stoves and kerosene space heaters (it is a natural by-product of combustion)   
  • Cigarette smoke
  • Cleaning products including deodorizers, furniture polish, and laundry stain removers     
  • Glue and adhesives

Formaldehyde is often found in nail salons. For example, nail hardeners contain formaldehyde among many other dangerous chemicals that are commonplace in nail salons.

Particle boards are one of the primary sources of indoor formaldehyde emissions.

How to measure formaldehyde?

You can measure the formaldehyde level using a portable Formaldehyde (HCHO) Indoor Air Quality sensor Tester meter that measure formaldehyde concentration in air.

It is widely used in interior decoration, decoration materials, chemicals, environmental monitoring and industries to detect the current gas concentration formaldehyde in the environment.

This item also measures TVOC in the air. Designed with electrochemical accurate HCHO sensor that measures up to 5ppm. It has wide LCD display with backlight function.

Display your readings in ppb or µg/m3 HCHO

Why formaldehyde is so hard to remove?

Formaldehyde is a tricky problem because it escapes from materials as a gas, and HEPA filters aren’t made to capture gases. We’ve heard companies claim that activated carbon can remove formaldehyde, but we’ve also seen companies selling sprays that claim to clear formaldehyde from your home. That sounds a lot like snake oil to us.

Different type of Filters

Due to the fact that most air purifiers rely simply on HEPA filters alone, these are great for filtering out fine particles, however, they are unable to remove VOCs (Volatile Organc Compunds)  such as formaldehyde.

The best option for chemical and odor filtration is granular activated carbon. Activated carbon is charcoal or another natural substance (such as coconut shell) that was treated with oxygen to make it very porous so that it can adsorb chemicals, gases and odors from gases or liquids. Adsorption (different from absorption) means that these volatile organic compounds like formaldehyde attach themselves by way of chemical reaction to the surface of the activated carbon, meaning they are trapped in there.

This means that air purifiers with activated carbon filters can eliminate formaldehyde and hundreds of other chemicals from the ambient air. Activated carbon has a high-efficiency rating when it comes to removing formaldehyde. In one independent test, an air purifier with an 18 lb. activated carbon filter was able to remove high levels of formaldehyde from a closed-off room in under six hours.  

So, if you combine an activated carbon filter with a HEPA filter, the air purifier will be able to remove chemicals such as formaldehyde as well as particles and provide better overall indoor air quality. The amount of activated carbon is important. The more activated carbon the more efficient and longer-lasting the filters.

Yes. Formaldehyde is very much a concern to you since it is used in so many household products and materials.

Formaldehyde exists in construction and building materials in most modern homes. It’s common in composite wood products such as plywood and particleboard. It may be in your home’s insulation. It is even used as a preservative in some medicines, cosmetics, fabric softeners as well as dish-washing liquids.

Formaldehyde is released in tobacco smoke, word-burning and gas stoves. So, chances are fairly high that you and your family (and pets, co-workers, etc.) are exposed to formaldehyde in your home or office.

Xiaomi Air Purifiers – Gen 1 and Gen 2 comparisons

Xiaomi Air Purifiers – Gen 1 and Gen 2 comparisons

Mi air purifier 2 is launched on November 24, 2015, it can be considered as the upgrade generation of the earlier Generation 1. Compared to the Gen 1 model, the biggest change was undoubtedly in its volume on a smaller foot-print, but also less space occupied. Mi air purifier Gen 2 is targeted mainly for small apartment users which can provide for purification area of 23-48 m².

Xiaomi has made the Air Purifier 2 lighter as well as smaller. As compared to the 735×260 mm laterally size Air Purifier 1, the Air Purifier 2 measures simply 520×240 mm.

The foot print area is also 15% smaller.

It houses a solitary electric motor, twin booster fans (which detoxifies at an effective variety of up to 39.6m²), The design of the Mi Air Purifier 2 was inspired by aircraft engines and comes with an anti-formaldehyde enhanced filter that’s replaceable. It also filters 99.99% of PM 2.5 particles and up to 92% of formaldehyde (a colorless, flammable, strong-smelling chemical that is used in building materials and to produce many household products).

Xiaomi says the more compact design is made possible by a new single-motor, dual-fan design, which has enabled it to shrink its dimensions by up to 40 percent over its predecessor. However, its smaller size means that Air Purifier 2 has had to take a slight performance hit compared to the predecessor’s dual-motor design. Its Clean Air Delivery Rate (CADR), or the amount of air it cleans per minute, is now 330m³/h in standard mode, compared to the 406m³/h for the larger model.

Still, this can go up to 388m³/h in Turbo mode and Xiaomi says it can filter the air in a 23m² room in only 10 minutes.

In addition to the smaller foot-print compared to Gen-1, some optimization was also done to the motor, dual-fan blower motor design in Gen-1 is now reduced to single fan motor in Gen-2, this also allowed energy saving of 58% compared to Gen-2.

The above chart shows the different recommended room areas for different CADR value, so that air can be purified efficiently by the air purifier.

Although smaller in size, and the motor going through some optimization and changes, but its purifying effect does not seem to lowered, the one-hour PM2.5 purification can reach 97.7%.

In the purification capacity, CADR is now 330 m³ per hour for standard mode, and in the turbo mode CADR is 388 m³ per hour, clean up area from 27.2 – 46.6 m² (292 – 500 ft²), it takes 10 minutes to complete a purification process once for a 23 m² (250 ft²) room.The firm additionally urges that the Air Purifier 2 is substantially more power efficient – 58 percent even more power efficient.

The company states that the newly improved device is now 11 percent quieter than in the first generation AP, and also makes merely 30db of noise when switched over to sleep mode.

The indicator LED is placed at 7.5cm from the ground, just to low enough to avoid the light interference when reading on the sofa or resting in bed.  The light sensor can be adjusted according to the indoor light LED brightness, the indicator can also be completely off.

Mi air purifier 2 is an intelligent air purifier with a WiFi connection to the phone, you can use Mi Smart Home App for live view of indoor air quality changes at home and will base on bedroom area to adjust according to the most appropriate mode of operation. It is smart enough to learn the user’s habits, such as automatically adjusted to sleep mode before you go to sleep, and  to automatically shut down when they go out.

New Addition – Control of new smart phone temperature, humidity sensor

Mi Air Purifier 2 had added the high quality Japan SHINYEI sensor, which provide real-time detection of indoor air PM2.5 content. The Air Purifier will change according to the data for air quality, and automatically switches to the optimum decontamination mode. In addition, AP2 also adds temperature, humidity sensors, which will provide mobile phone view on indoor air quality, temperature and humidity changes at a glance, helping you to always grasp the comfort of the indoor environment.

Coming to the mechanism, the Air Purifier 2 packs a quality Tri-filters: Pre-filter, HEPA filter and an Activated Carbon filter that comes with a filtering capability of whooping 99.7% of PM 2.5

Comparing the official specifications

Dimensions : First Generation is taller, second generation is smaller in size, the filter is common use for both generations.

Purification efficiency: First generation has better purification performance than 2nd generation, and with larger decontamination area as well.

Smart Module: Both generation 1 & 2 have WiFi module and air quality sensors, 2nd generation has added multi temperature and humidity sensors.

Power: First generation has maximum power consumption of 75W, 2nd generation has maximum power consumption of 31W.

Package Contents: Both generations has the same content, while the packaging size of 1st generation is much bigger, due to the taller size of the Air Purifieritself.

Purifier functions: Both generations have automatic mode, sleep mode, the switching mode switching, WiFi indicator, air quality indicator, particulate matter sensor, the difference is first generation has light sensor and Turbo mode, and the second generation has the Favorite mode.

Smart phone remote control functions: Both generations can be accessed through Smart phones for remote control functions, the second generation has a new temperature and humidity testing and comfort assessment functions.

Xiaomi Air Purifiers – Gen 1 and Gen 2 comparisons