NDACC: Network for the Detection of Atmospheric Composition Change

EVDC: ESA Validation Data Centre

PGN: Pandonia Global Network

ESA Sentinel-5p website

VDAF: Sentinel-5P Validation Data Analysis Facility

CAMS: Copernicus Atmospheric Monitoring Service

Copernicus: European Union's Earth observation programme

ESA Earth Observation Data

QA4ECV: EU FP7 project on Quality Assurance for Essential Climate Variables

NORS: EU FP7 project on Demonstration Network Of ground-based Remote Sensing observations in support of the Copernicus Atmospheric Monitoring Service

CINDI-2Cabauw Intercomparison of Nitrogen Dioxide Measuring Instruments 2

MADCAT: Multi Axis Doas - Comparison campaign for Aerosols and Trace gases