Dyson Purifier Big+Quiet Formaldehyde – Yay or Nay?

What a name, am I right? Two months after the launch of Dyson Purifier Big+Quiet Formaldehyde, we take it for a spin and see if it lives up to it’s name.

Oof. Big doesn’t even come close to describing this machine – at 83cm tall and approximately 43cm wide, Big+Quiet takes up quite a fair bit of real estate. Heaving the close to 12kg machine out of it’s massive box took a little bit of effort, but the little built-in wheels made it easy to navigate around my house.

Personally, when looking for an air purifier, I look out for some key criteria such as Quality, Design and Price. In my 506 sqft apartment, situating the machine right smack in the living room makes the room look smaller – but at the same time, I can see why it’s a smart investment. Love how it fits in with my apartment’s aesthetics easily too! Design – check.

Dyson’s latest air purification technology is definitely designed for large spaces – think office space, landed properties etc. The Dyson Purifier Big+Quiet Formaldehyde delivers up to 10-metre projection with its Cone Aerodynamics, and features an all-new K-Carbon filter for up to 3x better NO2 capture, alongside a CO2 sensor.

Convenient to Use

As with any Dyson product, its plug-and-play nature makes it easy to set up. Download the Dyson app if this is your first Dyson machine, and the Bluetooth sensor will automatically pair with your new toy in a matter of seconds. All filters are already pre-installed, and once you power the device up, the purification and surprisingly in-depth air analysis commences right away.

Formaldehyde is a colourless and flammable gas emitted by household appliances and furnitures that can cause irritation of the skin, eyes, nose, and throat. As the name suggests, this heavyweight machine can detect formaldehyde in the air and destroy it permanently.


After using it for about 3 weeks now, I can feel the air quality in my house significantly improve. For context, I have 3 hypoallergenic furkids (but they’re not the cleanest and often bringing dust and dirt into the house from their walks), and I’m quite sensitive to poor air quality, with my eyes and nose always acting up in our humid and hot climate in Singapore. The air now smells more.. crisp too. Quality – check.


The HEPA H13-grade particle filter is 3.8x larger than its predecessors and the equivalent are about 2 king-sized beds captures 99.95% of pollutants, including dust and allergens as small as 0.1 microns. This larger filter lasts up to 5 years and can be replaced easily and separately with the carbon filter.

The new K-Carbon filter helps combat gases, NO2 in particular, which can be emitted by daily activities such as whipping up a meal in the kitchen or simply by re-entering the home from outdoor sources. The K-Carbon filter traps up to 3x more NO2 than previous filters, increasing the capture efficacy.

CO2 Levels

For those who are unaware, CO2 actually makes you feel more lethargic and working from home or doing chores become that much more cumbersome. The new CO2 sensor detects PM2.5 and PM10 pollutants, NO2, VOCs, temperature and humidity – making it easier for you to track the CO2 levels in your house and deciding whether to open up more windows to air your space or not.

MyDyson App

Monitoring the air quality through the MyDyson app is super convenient, and allows you to track the purifier’s report card from anywhere, at anytime. I placed this in my living room (easily the biggest room in my apartment), and the machine is quite hardworking – sucking the air in and purifying and projecting clean air back into the room – improving the air circulation within a relatively larger space such as a living room.

Potential Ways to Use Big+Quiet

I intentionally leave the machine on while I’m at work, letting my furkids enjoy a cleaner and crispier air quality even when I’m not home. I’ve also noticed that the room is better and somehow cleaner smelling, making it a little bit more joyful to return home after a long day at work.

How Loud is It?

At full power, you can barely hear the Dyson Purifier Big+Quiet Formaldehyde while it’s hard at work. At a mere 56 decibels, this is one of the quietest and most powerful air purifier Dyson has ever invented. I wasn’t bothered when it was running the entire day I was home as I could barely hear it.

External Maintenance

While the filter can last for up to 5 years, the external body of the machine is definitely prone to collecting dust or get dirty over time. With a damp microfibre cloth, cleaning its exterior is easy – be sure not to use regular cloths as you may risk scratching it.

Difference Between Bright Nickel + Prussian Blue & Prussian Blue + Gold

The Dyson exclusive Prussian Blue + Gold version comes with SCO filter, K-Carbon filter and CO2 sensor. Priced at S$1,399, this beauty makes it an easy top up from the Bright Nickel + Prussian Blue version which costs S$100 lesser, but only comes with the SCO filter.

Yay or Nay?

Yay, only if you have a large space as this machine takes up a lot of real estate in a small living space.

Where To Purchase

Improve your house’s air quality for loved ones and yourself – get it from the following links:

Dyson Purifier Big+Quiet Formaldehyde (Bright Nickel + Prussian Blue) at S$1,299 from Shopee
Dyson Purifier Big+Quiet Formaldehyde (Prussian Blue + Gold) at S$1,399 from Dyson


A smart home technology geek and an Apple enthusiast.

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