AQMesh performance

AQMesh is the only small sensor air quality monitoring system that can demonstrate its performance across extensive global co-location comparison trials now spanning more than 7 years. AQMesh pods have been operating out in the field since 2012 next to certified reference equipment, in real applications, in real conditions, across all environments, throughout all seasons, for months rather than weeks or days.

During that time, improvements in electrochemical sensors and the unique, carefully developed, fully traceable AQMesh processing algorithms have given a dramatic improvement in performance and accuracy with AQMesh.

The table below shows how the correlation coefficient achieved for NO2 has improved significantly since AQMesh was first launched.

Sensor development

Version Production date NO2 sensor Characterisation Online processing Typical R2* Typical MAE**
V3.0 Jan 2013 – Dec 2014 Significant O3 cross-gas effect Manufacturer’s data Correction for cross-gas effects and environmental factors 0-0.03 Requires scaling
V3.5 Jan 2015 – Oct 2015 O3-filtered As V3.0 Correction for cross-gas effects and environmental factors 0.1-0.7 Requires scaling
V4.0 Jan 2015 – Oct 2016 As V3.5 Manufacturer’s data and characterisation at factory Correction for cross-gas effects and environmental factors 0.5-0.8 Requires scaling
V4.1 Limited release As V4.0 Factory characterisation and quality check More sophisticated corrected for cross-gas effects and environmental factors 0.7-.095 Dependent on variance between sensors
V4.2 Oct 2016 – Dec 2018 O3-filtered and improved response at higher ambient temperatures Factory characterisation, quality check, accuracy and precision tests As V4.1, but with optimised electronic setup and performance enhancements below the limit of detection >0.8 <5ppb
V5.0 Jan 2019 – Jul 2019 O3-filtered with new design and improved response to a wider range of conditions As V4.2 As V4.2, but optimised performance across a wider range of temperatures >0.8 <5ppb
V5.1 Jul 2019 – current As V5.0 As V5.0 As V5.0, but optimised further below the limit of confidence >0.85 <5ppb

R2 of >0.6 for NO2 is generally considered to be a strong enough performance.

*Readings at 15 minute average intervals.

**Typical prescaled variance.

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