| Sumario: | The Copernicus programme has been established to fulfill the needs of European policy makers to access accurate and timely information, which will help understand more precisely how the climate is changing, to mitigate its short- and long-term effects and ultimately to manage better the environment, and to ensure civil security. As part of Copernicus, ESA is undertaking the development of Sentinel-4, an ooperastional mission that will provide continuous, timely and accurate measurements of the composition of Earth's atmosphere over Europe and North Africa. On an hourly basis from a geostationary orbit Sentinel-4 will provide key data on critical gaseous constituents of the troposphere such as O3 (ozone), NO2 (nitrogen dioxide), SO2 (sulphur dioxide), HCHO (formaldehyde), CHOCHO (glyoxal) as well as aerosol and cloud properties. This continuous stream of scientific data will be used in support of the applications of Copernicus Atmosphere Monitoring Services (CAMS) for air quality monitoring and forecasting, and for other fundamental chemistry and climate applications
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