The new Dyson Big+Quiet Formaldehyde is its "quietest, most powerful purifier" yet

Dyson BigQuiet Formeldahyde in living room next to plants
(Image credit: Dyson)

Dyson’s been on a roll in recent weeks with product announcements and it’s not showing any signs of stopping with the launch of the Dyson Purifier Big+Quiet Formaldehyde.  

Not to be confused with the Dyson HEPA Big+Quiet Formaldehyde, which is designed for offices and other professional spaces, the Dyson Purifier Big+Quiet Formaldehyde gets its name from the fact it's been built to purify the air in large homes and rooms, without ever exceeding 56 decibels of noise.

Described as Dyson’s “quietest yet most powerful purifier”, it processes as much as 87 liters of purified air every second, and propels it up to 10 meters, using what’s known as Cone Aerodynamics. This is a new airflow system that uses the Coanda effect to more than double the airflow of any of its other purifiers. 

The Coanda effect is already seen in the Dyson Airwrap – it’s what pulls the hair towards the styling barrels and allows for hands-free curling – and in the Big+Quiet purifier it’s used to merge two streams of airflow into a condensed jet of air that propels the purified air far and wide around a room. 

The Big+Quiet purifier uses the same three-step filtration system seen across the rest of Dyson's best air purifier range but with a wave of improvements. Firstly, the entire system is fully sealed to HEPA H-13 standard – the highest tier of air filtration – meaning it can remove 99.95% of all particles in the air as small as 0.1 microns in diameter. This includes dust, allergens, pollen, and pet hair, and once it’s in the filter, the seal makes sure it stays there. Dyson also claims this filter will last five years – five times longer than previous systems. 

There’s a new CO2 sensor that tells the purifier when to ventilate the room, and a new K-Carbon filter said to be capable of capturing three times more Nitrogen Dioxide (NO2) than Dyson’s previous carbon filter. Such emissions can come from indoors – cooking and lighting candles – as well as from outdoor emissions that enter the home, from road traffic. This means it can also get rid of the odors that come from such sources. 

Elsewhere, the Nickel and Dark Blue version of the Big+Quiet purifier features Dyson’s Selective Catalytic Oxidation (SCO) filter designed to break down formaldehyde molecules into tiny amounts of water and CO2 continuously, without ever needing to be replaced. Formaldehyde is found in tobacco smoke, as well as in some glues, paints, pesticides, cosmetics, and detergents. It can also be found in wood products such as cabinets, furniture, plywood, and laminate flooring. It’s 500 times smaller than 0.1 micron particles and this makes it difficult to trap, let alone destroy.

“At Dyson, we are dedicated to solving problems that others ignore, and air purification is no different,” explains Dyson Engineering Director, Environmental Care, Matt Jennings. 

“The Dyson Purifier Big+Quiet Formaldehyde is our first purifier specifically engineered to purify properly in spaces up to 100m2. It blends highly effective filtration and powerful projection, to automatically respond to imperceptible pollution events. With new Cone Aerodynamics to project purified air over 10 meters, the Dyson Purifier Big+Quiet Formaldehyde can reach every corner of your living space.”

Dyson is yet to reveal the price or release date of this purifier. Dyson's Hot+Cool Formeldahyde purifier costs $769.99 / £699.99 / AU$1,149.00 and I'd expect this new model to cost similar. 

Dyson did tell me that the Big+Quiet purifier will go on sale in Australia first, before coming to the US and UK. I'll update this story as soon as we find out more specific details.  

Big+Quiet Formeldahyde cut through on black background

(Image credit: Dyson)

Opinion: Advanced filter tech offers peace of mind, but it's far from subtle 

After years of naively assuming the air quality in my home was safe – I don't smoke, I don't live by a main road, I don't have any pets, and there are few allergies in my family – I recently got a rude awakening whilst I was reviewing the Levoit Core 300S True HEPA air purifier.

Not only is the baseline air quality reading in the majority of the rooms in my house higher than I had expected, but I had no idea the level of pollutants released when simply spraying deodorant or cooking dinner. It makes me want to seek out the very best purifying technology, and that's what Dyson has seemingly built with its new Big+Quiet purifier. 

I love the sound of its fully sealed, high-grade filter, and the fact that this filter won't need to be replaced for years. Dyson hasn't revealed how much this purifier will cost yet but we imagine it won't come cheap, so any savings on replacement filters will undoubtedly be welcomed.   

Knowing that even the smallest of particles are being filtered from my home would definitely give me peace of mind, as would the addition of the formaldehyde filter – a rarity, even among the more expensive purifiers on the market. 

We have a relatively large house so the 10-meter coverage sounds impressive. However, we've previously used $150-$200 purifiers that are more than suitable for the size of the rooms we need the purifier for, so this feels like a nice-to-have rather than a necessity. 

Plus, although the use of the word "Big" in the purifier's name refers to the fact it covers such large spaces, it looks like it could also be used to describe the purifier itself. In the press images, this purifier looks less than discreet. If anything, I think it resembles a high-tech trash can and it's certainly not for people with minimal aesthetics or understated decor. 

TOPICS
Victoria Woollaston

Victoria Woollaston is a freelance science and technology journalist with more than a decade’s experience writing for Wired UK, Alphr, Expert Reviews, TechRadar, Shortlist and the Sunday Times. She has a keen interest in next-generation technology and its potential to revolutionise how we live and work.

Read more
Molekule Pro air purifier
The best air purifier 2025: for cleaner, healthier air in the home
The large Blueair air purifier sits facing forward on a wood surface against a pink background.
Blueair Blue Pure 411i Max / Blue Max 3250i review: my new favorite budget-friendly air purifier
The GoveeLife Smart Air Purifier Lite sits on a table with house plants on either side.
GoveeLife Smart Air Purifier Lite review: smart, swell, and it purifies well
Meaco 1056P fan in bedroom
Meaco MeacoFan 1056P review
Tineco Pure One A50S cordless stick vacuum with wand bent forwards
Tineco Pure One A50S cordless vacuum review: superb suction but a flawed design
Tester using Shark PowerDetect cordless vacuum in living room
Shark PowerDetect Cordless Stick Vacuum review
Latest in Air Quality
Shark TurboBlade fan
The new Shark fan can blast blades of air in any direction, and it's set to make summer far more bearable
Person switching on Meaco dehumidifier
Why a dehumidifier is your secret weapon for a cosy home with lower heating bills this winter
The GoveeLife Smart Air Purifier Lite sits on a table with house plants on either side.
GoveeLife Smart Air Purifier Lite review: smart, swell, and it purifies well
EcoAir Anti-Covid AVS in a room with people
Forget air purifiers – the world’s first ‘air sterilizer’ is here, and it claims to instantly inactivate Covid, cold, and flu particles
A range of Dyson fans against a pink background with Tech Radar, Big savings written in white to the left.
As the Black Friday discounts roll in hot and fast, here are the best Dyson fan deals to cool off with
The large Blueair air purifier sits facing forward on a wood surface against a pink background.
Blueair Blue Pure 411i Max / Blue Max 3250i review: my new favorite budget-friendly air purifier
Latest in News
DeepSeek
Deepseek’s new AI is smarter, faster, cheaper, and a real rival to OpenAI's models
Open AI
OpenAI unveiled image generation for 4o – here's everything you need to know about the ChatGPT upgrade
Apple WWDC 2025 announced
Apple just announced WWDC 2025 starts on June 9, and we'll all be watching the opening event
Hornet swings their weapon in mid air
Hollow Knight: Silksong gets new Steam metadata changes, convincing everyone and their mother that the game is finally releasing this year
OpenAI logo
OpenAI just launched a free ChatGPT bible that will help you master the AI chatbot and Sora
An aerial view of an Instavolt Superhub for charging electric vehicles
Forget gas stations – EV charging Superhubs are using solar power to solve the most annoying thing about electric motoring