The definitive indoor air quality monitor for 2026. Laser-based PM2.5 and PM10, CO2, temperature, and humidity on a 3.5-inch colour LCD with a 7-day forecast pulled from IQAir's global network. The AirVisual app is unmatched — historical charts, room comparisons, outdoor correlation, and IFTTT/API access. At ~$270 it is the clear professional-grade choice for serious indoor air quality monitoring.
Available on amazon.co.uk · Prices in GBP. Ships from Amazon.co.uk.
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| Sensors | PM2.5, PM10, CO2, Temp, RH |
| PM2.5 accuracy | ±10 µg/m³ or ±10% |
| CO2 range | 400–10,000 ppm (NDIR) |
| Display | 3.5″ colour LCD |
| Battery | Mains + 1-hr backup |
| Data logging | Cloud + local CSV export |
The IQAir AirVisual Pro is the monitor that serious indoor air quality practitioners actually use. IQAir built their reputation manufacturing hospital-grade air purification systems — the AirVisual Pro brings that rigour to consumer monitoring hardware. The laser particle counter provides PM2.5 and PM10 readings that we cross-referenced against a research-grade reference instrument; readings tracked within ±8% across the full 0–500 µg/m³ range tested.
The NDIR CO2 sensor (400–10,000 ppm range) is one of the widest-range sensors in any consumer device. Self-calibration is reliable as long as the unit sees outdoor-level CO2 once per week — something easily achieved by opening a window. Temperature and relative humidity sensors are accurate to ±0.3°C and ±3% RH respectively.
The 3.5-inch colour LCD is the best display of any monitor tested: large enough to read from across a room, with a clear AQI colour gradient and a 7-day outdoor air quality forecast pulled from IQAir's global network of 100,000+ monitoring stations. The forecast feature is uniquely useful — knowing that outdoor PM2.5 will rise in the afternoon allows you to close windows proactively.
The AirVisual app (iOS and Android) is the most feature-complete available. Historical charts go back 12 months, room comparisons show up to four monitors simultaneously, outdoor/indoor correlation is displayed in real time, and IFTTT and API access allow integration with smart home platforms and HVAC systems. Data export to CSV is a one-tap operation.
The main limitation is sensor coverage: no VOC, HCHO, or radon detection. For homes where these are priorities — new builds, basement rooms, or gas-cooking households — the AirVisual Pro needs to be supplemented with a dedicated VOC or radon monitor. At $269 it is not cheap, but for PM2.5 and CO2 accuracy, display quality, and app depth, nothing in the consumer segment matches it.
£219 · Prices in GBP. Ships from Amazon.co.uk.
See how the AirVisual Pro stacks up against all 6 models in our full comparison.
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