NDACC: Network for the Detection of Atmospheric Composition Change
EVDC: ESA Validation Data Centre
PGN: Pandonia Global Network
VDAF: Sentinel-5P Validation Data Analysis Facility
CAMS: Copernicus Atmospheric Monitoring Service
Copernicus: European Union's Earth observation programme
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-2: Cabauw Intercomparison of Nitrogen Dioxide Measuring Instruments 2
MADCAT: Multi Axis Doas - Comparison campaign for Aerosols and Trace gases