Breathe London Air-Quality Sensor Network
This overview was generated with AI from the public sources listed below and checked against them before publication. It has not had a complete human fact-check — treat it as a starting point and follow the sources.
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Philanthropy pays for it, a university runs it. From around 130 nodes in 2021 it grew past 400 across all 33 London boroughs, streaming free hourly readings to schools and community groups.
what does this mean?
The strongest source is the operator's or the city's own reporting — an official report, dataset or press release. It grades who did the looking — not how well the project went. All four grades →Part of 1001 Smart Cities — 1,167 documented projects · 🏙️ 15 more in London · 🌫️ Air quality guide · 🌱 Environment projects
A network of Clarity Node-S sensors measuring nitrogen dioxide and PM2.5, run by Imperial College London's Environmental Research Group with the Mayor of London and Bloomberg Philanthropies. Relaunched in 2021 with around 130 nodes, it grew to over 400 across all 33 London boroughs by 2023, streaming free hourly air-quality data to schools, hospitals and community groups.
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📎 Cite this project
1001 Smart Cities (2026). “Breathe London Air-Quality Sensor Network” — London, United Kingdom. The Smart City Atlas. https://1001smartcities.org/projects/london-breathe-london/ (last verified 2026-07-17). Data: CC BY 4.0.
The underlying data is free to reuse with attribution — see the open data page.