Open-source hardware
The AirGradient monitors we supply are open-source: hardware, firmware and software. You can inspect how they work, and maintain and repair them yourself if you wish.
Air pollution analytics
Open-source air-quality monitoring for the UK
We design, supply, install, calibrate and maintain air-quality sensor networks for councils, schools, industry and communities, and we turn accurate data into clear, honest reports. You always own the data, every processing step is open and documented, and there are no annual subscriptions for data access and no ‘black box’ algorithms.
- Authorised AirGradient reseller
- Our QA/QC and calibration methods were developed by a team at the University of Cambridge
- We work in accordance with PAS 4023:2024, the BSI standard for best practice in small sensor technologies
Why "Air Priori"? A priori is Latin for “from what comes first”. Understand the air first, then act. What our name means →
What makes us different
Monitoring you can trust
No black-box algorithms
We tell you exactly how your data is processed and calibrated. Raw readings are never overwritten, and every reading can be traced back to its source.
You own your data
Your monitoring data belongs to you. We never share it without your permission, we charge nothing to access it, and you can download it at any time.
Who we help
Monitoring designed around your question
Councils & public sector
Dense, well-maintained sensor networks that show how air quality varies street by street, complementing your reference stations and diffusion tubes.
Schools & education
Classroom CO2 monitoring for better ventilation, and school-gate monitoring of the traffic pollution children breathe on the way in.
Industry & construction
Boundary monitoring for construction sites, ports, quarries and industrial premises, so you can see what leaves your site and show neighbours and regulators what you are doing.
Homes & communities
Affordable, open-source monitors for homes and community groups, with data that belongs to you and can be shared openly.
Monitors
The AirGradient range
Indoor, outdoor and portable monitors from AirGradient, supplied and supported by Air Priori in the UK.
Outdoor monitor
AirGradient Open Air Max
Professional solar-powered outdoor monitor with dual particle sensors, 4G connectivity and optional electrochemical nitrogen dioxide (NO2) and ozone (O3) sensors. Our recommended node for council and industrial networks.
Outdoor monitor
AirGradient Open Air
Compact, weatherproof outdoor monitor for PM2.5, CO2 and more, available with Wi-Fi or with built-in 4G cellular connectivity.
Indoor monitor
AirGradient ONE
Indoor monitor for classrooms, offices and homes: CO2, PM2.5, TVOC/NOx index, temperature and humidity, with a built-in display and AQI LEDs.
Portable monitor
AirGradient Go
Portable, weatherproof personal monitor with GPS and an e-ink screen, for measuring exposure on the move: walks, cycles, commutes and site visits.
New product. AirGradient states certification is in progress and the final sensor configuration may change. Contact us for availability.
How it works
From question to evidence
1. Design
We discuss your project, agree the most appropriate technology, survey potential sites and help design your network.
2. Install
We can install and commission every monitor, with a documented handover for each site.
3. Calibrate
We can correct and calibrate the data continuously against reference measurements, and check it on an ongoing basis.
4. Report
A comprehensive dashboard and map, with valuable insights tailored to your specific needs.
Open data
See what is happening, hour by hour
Every monitor reports to an online dashboard. You can see live readings, trends over days and months, and how your sites compare with health-based guidelines. You can make your data public, or keep it private. The choice is yours.
Many public bodies choose to share their data openly so everyone can learn from it. We encourage this wherever it is appropriate, and we respect it when it is not.
Analytics & reporting
Our people
Decades of air-quality experience
Our team brings decades of experience in air-quality instrumentation, atmospheric science and gas-sensor development. This includes delivering the Breathe London pilot network, pioneering low-cost sensor networks, and developing QA/QC and network calibration methodology with a team at the University of Cambridge.
Meet the team →Questions
Frequently asked questions
What does Air Priori do?
Air Priori provides air-quality monitoring as a managed service across the UK: we design, install, calibrate and maintain networks of low-cost sensors, quality-control the data, and turn it into clear reports and insights.
We also supply AirGradient indoor, outdoor and portable monitors on their own, with setup support, for customers who want to run them themselves. Our monitoring is indicative and decision-support: it complements, and does not replace, statutory reference monitoring.
Who owns the monitoring data?
You do. If you buy and operate monitors from us, you own the data they generate. We process it only to deliver our services, and we never share or publish it without your express permission.
Do I have to pay to access my own data?
No. Access to your data through the online dashboard is included with your monitors, not sold as an extra, and on cellular monitors the SIM and mobile data are included for up to 5 years (after that, a low-cost replacement 5-year data bundle is available). You pay only for optional services you choose, such as installation, calibration, maintenance and reporting.
Who do you work with?
We work with councils, the health service and other public bodies; schools, colleges and universities; construction, port, transport and industrial sites; homes and community groups; and special-interest groups such as sports, athletics and cycling clubs, helping them understand how air pollution affects performance.
Councils use networks to see how air quality varies street by street and to evaluate intervention and mitigation schemes. Schools use indoor CO2 monitors to manage ventilation, and outdoor monitors at the school gate and in the playground. Industrial and construction sites monitor dust at their boundary, and households and community groups monitor the air where they live, work and play.
Can I make my data public?
Yes, and we encourage it wherever it is appropriate. Open data lets everyone learn from it, and many public bodies choose to publish. If publishing is not appropriate for you, we fully respect that and your data stays private.
Talk to us about your monitoring
Tell us what you need to find out. We will recommend the right monitors, where to put them and how to make the data trustworthy, with no obligation.