Most of us spend the majority of our time indoors, yet few know what is in the air at home. An indoor air quality monitor makes it visible: carbon dioxide climbing in a closed bedroom overnight, a spike in fine particles when you sear a steak, or chemical vapours from new furniture. In parts of Britain, particularly the South West, Derbyshire and North Wales, there is also radon, a natural radioactive gas you cannot detect without a device.
This guide is for anyone who wants better sleep, a healthier home office or peace of mind about radon. We compared the monitors most UK buyers will find, by what they actually measure, how accurately the sensor type tends to perform, and price.
Air quality monitors at a glance
| Rank | Monitor | Price | Best for | Standout fact |
|---|---|---|---|---|
| 1 | Aranet4 Home | about £174 | Accurate CO2 | NDIR CO2 sensor and e-ink screen |
| 2 | Airthings View Plus | about £166 | Everything including radon | Seven sensors including radon and PM2.5 |
| 3 | Qingping Air Monitor Gen 2 | US $149.99 | All-round value | CO2, PM2.5 and VOC with a touchscreen |
| 4 | Airthings Wave Plus | about £147 | Radon plus CO2 | Battery-powered radon and CO2 |
| 5 | Awair Element | £229 | Design-led smart home | Still sold in the UK; tracks five factors |
| 6 | IKEA Vindstyrka | £35 | Budget particle checks | PM2.5 and VOC for the price of a takeaway |
| 7 | Airthings Corentium Home 2 | US $179.97 | Radon only | Long-life AA radon detector |
| 8 | Netatmo Smart Indoor Air Quality Monitor | about £60 to £110 | Simple CO2 alerts | Light glows to warn of high CO2 |
How we chose
This list draws on manufacturer specifications, UK retailer prices checked in October 2026, and independent testing and owner reports. We have not run our own chamber tests. We prioritised monitors with proper NDIR carbon dioxide sensors (the reliable kind, rather than estimates derived from VOC readings), laser particle sensors for PM2.5, and, for radon, devices from established makers.
The best air quality monitors, ranked
1. Aranet4 Home
The Aranet4 Home, from Latvian maker SAF Tehnika, is the CO2 monitor scientists and ventilation geeks tend to recommend. It uses an NDIR sensor, shows CO2 alongside temperature, humidity and air pressure on a low-power e-ink screen, and runs on AA batteries for long periods. A traffic-light indicator tells you when to open a window.
It does not measure particles or VOCs. That is the trade-off: it does one job very well. UK weather and instrument specialist Crondall Weather lists it at £173.63.
Price: about £174
Pros
- Trusted NDIR CO2 accuracy
- E-ink screen readable anywhere, long battery life
Cons
- No PM2.5 or VOC sensor
- Expensive for a single pollutant
2. Airthings View Plus
The Norwegian company’s flagship measures radon, PM2.5, CO2, VOCs, temperature, humidity and air pressure: the most complete home monitor here. It runs on six AA batteries for around two years or from USB-C, and syncs to the Airthings app. Smart Home Compared lists it at US $329.99, and PriceSpy showed it in stock at Amazon UK for £165.50 in October 2026.
One owner complaint is that the display is not backlit. For a home in a radon-affected area that also wants CO2 and particle tracking, it is the one-box answer.
Price: about £166 (US $329.99)
Pros
- Radon plus every common indoor pollutant
- Battery or mains power
Cons
- Expensive
- Unlit display
3. Qingping Air Monitor Gen 2
Qingping’s monitor covers CO2, PM2.5 and VOCs on a 4-inch IPS touchscreen, at a US launch price of US $149.99, making it the value pick for an all-in-one device. It also tracks PM10, noise, temperature and humidity, and connects over Wi-Fi to the Qingping+ app, which keeps 30 days of history you can export. Smart Home Compared lists no Apple Home, Matter or Alexa support.
Price: US $149.99
Pros
- CO2, PM2.5 and VOC in one device
- Large, clear screen
Cons
- VOC reading is an index, not a precise figure
- No Apple Home or Matter support
4. Airthings Wave Plus
The Wave Plus measures radon, CO2, VOCs, air pressure, humidity and temperature. It has no screen; you wave a hand in front of it for a coloured light, and read the details in the app. PriceSpy shows it at £147.25 on Amazon. It lacks a particle sensor, but for radon plus CO2 at a lower price than the View Plus, it is a good compromise.
Price: about £147
Pros
- Radon and CO2 in one
- Discreet design
Cons
- No PM2.5
- No screen
5. Awair Element
We checked Awair’s status: the company still sells the Element to homes, listing it at £229 in the UK and €259 in the EU on its website, alongside its business-focused Omni. The Element tracks CO2, PM2.5, VOCs, temperature and humidity with an attractive dot-matrix display.
Buyers should know that Awair removed features and support for some older devices in November 2022, which shows the risk of cloud-dependent monitors. The Element remains supported today.
Price: £229
Pros
- Attractive design
- Five key measurements
Cons
- Pricey for its sensors
- History of ending support for older models
6. IKEA Vindstyrka
IKEA’s Vindstyrka costs £35 and measures PM2.5, total VOCs, temperature and humidity on a small built-in display. It works on its own, or with IKEA’s DIRIGERA hub and Home smart app, and can drive IKEA’s Starkvind air purifier automatically when particles rise.
It does not measure CO2, so it will not tell you when a bedroom needs airing. Treat it as an inexpensive particle and cooking-fume alarm.
Price: £35
Pros
- Very cheap
- Works without a hub
Cons
- No CO2 sensor
- VOC reading is only an index
7. Airthings Corentium Home 2
If radon is your only worry, the Corentium Home 2 is a simple digital radon detector with an LCD screen that runs on two AA batteries for about three years. It also shows temperature and humidity. Smart Home Compared lists it at US $179.97.
Price: US $179.97
Pros
- Continuous radon readings with no subscription
- Very long battery life
Cons
- Radon only
- No CO2, particle or VOC sensors
8. Netatmo Smart Indoor Air Quality Monitor
Netatmo’s aluminium cylinder measures CO2, temperature, humidity and noise, and its light changes colour when CO2 gets high. It is not new, but it is frequently discounted: Crondall Weather had it at £59.99, down from £109.99. It lacks particle and VOC sensors.
Price: about £60 to £110
Pros
- Simple CO2 alerts
- Often discounted
Cons
- No PM2.5 or VOC sensor
- Ageing design and app
Buying guide: what an air quality monitor should measure
CO2 for ventilation. Carbon dioxide is the best everyday proxy for stale air. The Health and Safety Executive’s guidance on CO2 monitors says levels consistently above 1,500ppm in an occupied room indicate poor ventilation, and treats 1,000ppm as roughly equal to the 10 litres of fresh air per second per person recommended for most workplaces. Insist on an NDIR sensor; cheaper “eCO2” figures are estimates.
PM2.5 for cooking, candles and wood smoke. Fine particles are the pollutant most linked to health harm. The World Health Organization’s 2021 air quality guidelines set an annual level of 5µg/m³ and a 24-hour level of 15µg/m³, not to be exceeded on more than three or four days a year. A monitor shows when cooking or a wood burner pushes indoor levels far above that.
VOCs: useful trend, unreliable number. VOC sensors detect a mix of chemicals and report an index or estimate. They are good for spotting a change, such as fresh paint, but not for diagnosing a specific gas.
Radon if you live in an affected area. The UK Health Security Agency sets an action level of 200Bq/m³ for homes and recommends long-term measurement over three months, using two detectors: one in a bedroom and one in a living room. Check whether your area is affected on UKHSA’s UK Radon website, which also sells laboratory-analysed test packs (£52.80 including VAT when we checked). A digital monitor gives continuous readings but is not a substitute for a formal test if you are buying a house or considering remediation.
Humidity matters too. Most monitors also report relative humidity. Damp homes encourage condensation and mould, while very dry air in winter can irritate eyes and throats; a monitor shows whether drying washing indoors or running a dehumidifier is making a difference.
Sensor placement and calibration. NDIR CO2 sensors drift slowly over time and many recalibrate automatically by assuming they see fresh outdoor air every so often, so airing the room now and then helps. Particle sensors can clog in dusty or greasy kitchens; keep them a little away from the hob.
Screen, app or both. A screen gives instant answers to everyone in the house; an app gives history and alerts. If you want one for a child’s bedroom, a glowing traffic light is easier than numbers.
Carbon monoxide is different. None of these devices replaces a certified carbon monoxide alarm, which every home with a fuel-burning appliance should have.
What to ignore. Single “air quality scores” that blend everything into one number; look at the individual readings.
Health note: a monitor helps you ventilate and spot problems; it does not diagnose illness. If you have asthma or symptoms you think are linked to your home, speak to your GP.
Air quality monitor FAQs
What is a good CO2 level indoors?
HSE guidance says levels persistently above 1,500ppm in an occupied room point to poor ventilation, and around 1,000ppm corresponds to the airflow it recommends for most workplaces. Outdoor air now sits at roughly 425 to 430ppm, so the lower your reading sits towards that, the fresher the room. Open a window or run extraction when readings climb.
Does the IKEA Vindstyrka measure CO2?
No. It measures PM2.5, a VOC index, temperature and humidity. For CO2 you need a monitor such as the Aranet4, Qingping, Airthings View Plus or Netatmo.
Is Awair still in business?
Yes. Awair still sells the Element monitor for homes, listed at £229 in the UK on its website, and runs a business product line. It did end support for some older devices in 2022.
How do I test for radon in the UK?
Start with UKHSA’s UK Radon website to see whether your home is in an affected area, then use a long-term test pack, with two detectors left for three months. Digital monitors from Airthings give continuous readings but should not replace a formal test for property decisions.
Where should I put an air quality monitor?
At breathing height in the room you use most, such as a bedroom or home office, away from windows, radiators and the hob. Radon monitors belong in the lowest occupied room.
Can an air purifier fix what the monitor finds?
An air purifier with a HEPA filter reduces PM2.5 from cooking, smoke and pollen, and a monitor shows whether it is working. Purifiers do not lower CO2; only ventilation does that. Radon needs ventilation or professional remediation, not a purifier.
Do I need an app?
No. Aranet4, Vindstyrka and the Corentium Home 2 all show readings on the device. Apps help you track trends and get alerts.
