The Copernicus Atmospheric Monitoring Service (CAMS) provides consistent quality information on air pollution and health, solar energy, greenhouse gases and climate impacts worldwide. CAMS is one of six services that make up the European Union's Copernicus Earth observation programme, which focuses on our planet and its environment, ultimately for the benefit of all European citizens. Copernicus offers information services based on satellite Earth observation, (non-satellite) in situ data and modeling. The CAMS service is implemented by the European Center for Medium-Range Weather Forecasts (ECMWF) on behalf of the European Commission. ECMWF is an independent intergovernmental organization supported by 35 countries. It is a research institute and 24/7 operational service that produces and disseminates numerical weather forecasts to its member states. ECMWF collaborates with many service providers across Europe to provide and further develop the CAMS portfolio. CAMS thus brings together the expertise and infrastructure that exists in Europe and provides a range of services unmatched by any other organization in the world. To obtain all the observations needed to establish CAMS services, ECMWF cooperates with the European Space Agency (ESA) and the European Organization for the Exploitation of Meteorological Satellites (EUMETSAT), as well as many other organizations providing satellite and in situ observations.