Mi Air Purifier – Maintenance the Sensor

The Black Sponge

Some batch of air purifier comes with a black sponge inside the sensor cover, some asked whether the sponge needs to be removed.

Xiaomi had explained that the black sponge is to protect the purifier sensors, in order to block the dust from sticking to the sensor, you do not need to remove it.

Of course, do not panic if you do not have sponge inside your sensor cover, as Xiaomi’s support team had explained, different batches are using different protection method, if no sponges found with your sensor, do not worry.

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.

All about Air pollutions, Xiaomi air Purifiers and Filters

Haze has been an ongoing problem in many countries in the Southeast Asia region, and Malaysia is one of the worst affected. The haze crisis grips the region nearly every year during the dry season, when agricultural land is illegally cleared by burning in Indonesia. During the haze period Malaysian skies will be a smoky grey for most of the months.

Get the latest API (Air Pollutant Index) readings from official site – http://apims.doe.gov.my/v2/

How does that affect our health?

First, we need to know some facts that most of us may not be aware of, even we are unconsciously every few seconds of our lives.

As the air that we breathe is almost invisible to us, we may not be aware of the ubiquitous killer that had threatened the health of our families, for both in-door and out-door air.

There are various threats present in the air that we breathe.

Where are air purifiers deployed?

We spend majority of our times in-door

Quality air purifiers have never been more important for good health. The tight seals that make your home comfortable and energy efficient also trap indoor air pollution. From cooking fumes and cleaning vapors to dust and pet dander, there is a wide variety of vapors and particles that pollute indoor air. Statistics from the Center for Disease Control (CDC) and Environmental Protection Agency (EPA) have shown that the air inside your home can be five to ten times dirtier than the air outside, and more importantly, Americans spend an average of 90% of their lives indoors.

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.

Type of filters

Different air purifier filters target different types of air pollution, and what they target depends almost exclusively on the type of filtration technology they employ. HEPA air purifiers are the most popular, and they are perfect for eliminating household allergens such as dust, animal dander, pollen, and other particulate. They are not very good at capturing ultra-fine particles like viruses or eliminating foul odors, organic compounds, smoke, or chemical fumes. Because different air purifier technologies have different strengths and weaknesses, many modern air purifiers combine two or more filter or media types in the same unit. 

The Xiaomi standard filter filter utilizes a HEPA filter along with a thick bed of activated carbon to help eliminate dust, pollen, and dander as well as things like smoke, odors, and chemical vapors.

  • HEPA (High Efficiency Particulate Air) Filters set the standard for air purification. By definition, a HEPA filter removes at least 99.97% of all particles as small as 0.3 microns.HEPA filters allow only very small particles to pass through them. Allergens such as pollen, animal dander, mold spores, and dust get trapped in the filter. The main disadvantage of the HEPA air purifier is that you have to periodically change the filter. The main advantage: if it is HEPA certified, then you know it works well for all common particle allergens. However, not all HEPA filters are created equal. Size matters: the more square feet of HEPA filter, the more particulate it will be able to remove. The size, material, and construction of the actual filter media all play a role in the air purifier’s performance and may account for why one HEPA filter is more expensive than another.
  • Activated Carbon Filters are rarely used alone to purify the air, but they are often used in conjunction with other filters. Activated carbon/charcoal filters excel at adsorbing odors and gases and neutralizing smoke, chemicals, and fumes. When carbon is treated with oxygen, it opens up millions of pores. There are so many of these tiny pores and fissures that one pound of activated carbon has a surface area of 60 to 150 acres. This huge surface area makes it ideal for adsorbing gases and odors, providing an enormous surface area for potential bonding with chemical/vapor molecules. The larger the carbon filter, the more chemicals it will be able to absorb and the longer it will keep on working. When it’s full, when it can adsorb no more chemical molecules, it has to be replaced. 

Among the 3 different types of Xiaomi air purifier filters, they are generally available as:

a) The green Standard Edition is ship as default filter with the generation 1 purifier, and is available separately as add-on items;

b) The blue Particulate Removal Edition is ship as default filter with the generation 2 purifier, and is also available separately as add-on-items;

c) The Formaldehyde Edition is sold separately as single item, and is not included as default filter in Gen 1 or Gen 2 purifiers;

Air Purifier Air Exchanges  

Most quality air purifiers operate efficiently and quietly in a one room environment. To be effective, an air purifier must have a motor and fan powerful enough to properly circulate air throughout the space. Once the air is pulled into the unit, it is filtered through various types of filter media, and clean air is released back into the one room environment to start the cycle all over again. The amount of time it takes an air purifier to cycle through all of the air in a room is referred to as an “air exchange.”

The more air exchanges per hour (ACH), the better air quality in the room. The number of air exchanges is determined by two things: the cubic feet (volume) of a room and the cubic foot per minute (CFM) output of the air purifier. All air purifier manufacturers list airflow ratings (in CFM) for each fan setting at which their machine operates. Ideally, you want to set a goal of 4 to 6 air exchanges per hour. There is no such thing as overkill when talking about air exchanges.

Proper Placement of an Air Purifier  

As a general rule, it is more difficult to filter the air in a large and open space, and this is mainly due to inadequate air circulation. Large living rooms and family areas, especially those with abnormally high ceilings, present a challenge to effective air filtration. Our rule with larger rooms is to attempt to direct the purified air exhaust from the air purifier to the vicinity of the rooms inhabitants. Inside a room, be sure to keep adequate space around the air purifier, typically 18″ or more. Most units intake air from multiple sides, and restricting this by placing the air purifier against a wall or piece of furniture will reduce efficiency.

In the bedroom, place the unit 6-10 feet from the headboard of the bed with the directional registers pointing at the bed. This is often far enough away to avoid feeling a draft but close enough that cleaned air is reaching you.

Most air purifier manufacturers implement a bottom to top airflow, meaning the air is pulled into the machine at the bottom and released towards the top.

All About Xiaomi’s Mi Smart Home App (Mijia)

Note : All features, descriptions and screen captured for this write-ups are accurate at the time of writing, but are subjected to changes due to the high pace of App changes and new devices being added, some features may no longer work, or some newly added. Some App interface may also change

Mi Home Mijia App

About the App
Mi Smart Home app is your home intelligent hardware management platform. You can interact your Smart Phone with all the Xiaomi smart hardware and achieve inter-operability between them, and experience the convenience of intelligent life.

Mi Smart home Apps currently can manage over 300+ Mi Ecosystem products, including the following Xiaomi products : Mi Air purifier Gen 1, 2, 2s, 3, PRO & MAX, Water Purifier, MiWiFi routers, Master Remote controller, MiTV, all versions of MiBoxes,  Mi Robot vacuum, WalkingPad A1, Sport shoes, Mi Smart Home Kits, Yi IP Cam, Yeelight LED Bulb, Smart Plug, Power Strip Panel, Internet Radio, Midea Air Conditioner, Aux Air conditioner, Junxing Air Conditioner and Philips Eyecare Lamp.

All the devices and settings are currently store on Mi Clouds, where you can easily backup and retrieve. Simply sign-in to the Mi Cloud with your Mi Account on a mobile phones, and all the saved configurations and settings are all retrieved on the new Smart Phones. 

Installing and Setting Up Mijia App

If you do not already have a Mi account, you need to create and register one, follow the 3 steps as shown in screens above. Please remember to check your email to activate the Mi account before you can use. Please remember to select “China” as country/region so that you can detect the devices that are only available in China.

1) Selecting your Hosting country / region

In the past, Xiaomi only provide their Cloud hostings in China and users of the Mi Smart Home App outside China regularly facing “time-out” or “connection problems” whenever they are registering for new devices under the App. This is mostly due to the great China Firewall or DNS settings in local ISPs.

Starting from 2016, Xiaomi had added more cloud locations for some of their major markets outside China, these locations include Singapore, Taiwan and India. You can now decide where to host your Smart Home App, where all your settings and configurations will be back up ONLY* to the cloud location that you had selected. If you switch region, you will not be able to retrieve all your previous settings from the previous region’s cloud storage.

To choose the Mi Cloud location, you must logout first, then select the location, and log in again.

* Please note, your settings will only be saved on the cloud servers that you had selected, i.e if you initially select your location as Chinese Mainland, if you later log in and select Singapore, your settings will not be available as they are never saved on Singapore servers.

Please Note:
Note : At the time of this writing, not all regions support all devices released from Xiaomi, if you are buying products only available in China market, you’ll probably still need to select Chinese mainland as the region. But due to the unpredictable China firewall, sometimes you may not be able to register and save your configuration & settings on Mi Cloud during the initial setup.

It is best to select China as the Region, as all devices released under Xiaomi Eco System can all be added to your Mijia, and only a handful are released outside China. IF you are die-hard fans of Xiaomi new devices, would be better to choose China as region, otherwise you will face problem in connecting these devices during the setting up.

What is the minimum Android and iOS version supported for this app?

At the time of this write-up the minimum version of the major two mobile OS supported are as follow:

      Android – 4.0 and above
IOS – 7.0 and above

But with the increasing addition of new Smart devices under Xiaomi’s Mi Ecosystem product series, the Apps are continuously being updated by Xiaomi, whether they will withdraw support for certain older OS, we do not know.

Where to get and install the Mi Smart Home App?

You can access the latest version of the App at the official App site – http://home.mi.com/index.html, which is only available in Chinese interface, or download them by scanning the QR code below.

You can also get them from the respective official app stores.



** Please make sure you are downloading ONLY the official Apps and not from third party sources.

Setting up using Mijia App – Adding device

In the video below, a bit outdated on the App interface, you can look at how to install new devices in the Mi Home (Mijia) APP. The Mi home app supports a large number of Bluetooth- and Wifi- enabled devices from Xiaomi’s rapidly growing Mijia ecosystem

Further info
You can also visit their official Forum site for latest discussion and releases for Mi Smart Home App, but this site is only available in Chinese