CERC working with Vodafone on Mayor of London’s Breathe London sensor network

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Jun. 23, 2025

CERC is delighted to be part of the new consortium running the Mayor of London`s Breathe London network. The consortium will coordinate all 136 existing air quality sensor sites across the capital, introducing advanced methodologies for sensor calibration and data quality assurance, and engaging key community groups and organisations such as schools, NHS Trusts and Local Authorities to make accurate air quality data available to everyone in London, and mobilise communities in the fight against toxic air.

CERC`s role is to provide a robust and reliable operational calibration and quality control system, and secure online access to the current and historical NO2 and PM2.5 measurements through the Breathe London API. The network calibration system was developed using an innovative scale-separation technique pioneered by consortium members Professor Rod Jones and Dr Olalekan Popoola from the University of Cambridge. Amy Stidworthy from CERC`s Forecasting and Data Services team explains the network calibration method and gives examples of comparisons with measurements from reference-standard instruments in this video.

The Breathe London Consortium is led by Vodafone, who also provide sensor connectivity and hosting infrastructure, and brings together leading experts in all aspects of air quality. Airly provides the sensors, Scotswolds provides expert oversight of sensor installation and data quality, Global Action Plan leads community engagement including the website, and Ricardo will conduct an independent annual review of sensor data quality.

Announcing the new phase of Breathe London, the Mayor of London, Sadiq Khan said: I am delighted that Vodafone will deliver the next stage of my pioneering Breathe London programme by leading a consortium of partners and utilising their technical expertise and advanced connectivity. Reducing London`s air pollution is one of my top priorities and this advanced monitoring network will provide invaluable data to help organisations across the capital take action on air quality and protect public health.

You can read the full press release online.

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