May 05 2021 The Breathe London pilot, which used 100 AQMesh pods as part of a ground breaking city-wide network of air quality monitoring stations, proved that small sensor monitoring technology can be deployed successfully to give results comparable with those of reference equipment. An independent audit of the quality assurances and control procedures for the Breathe London network, conducted by National Physics Laboratory (NPL), has been published and highlighted encouraging results for AQMesh performance.* Overall, a mix of comparison methods was used to scale and quality control the whole network, including AQMesh co-location with reference - the gold pod method - and Professor Rod Jones’ network calibration scaling method. The gold pod method, as developed by AQMesh, featured extensively and provided R2 values over 0.9 for both NO2 and PM2.5. NPL found that “the activities conducted for the audit purpose and the associated findings revealed a strong adherence of the data processing and management to the Breathe London QA/QC requirements.”*