ALT Concentrations d'ozone (O3) au-dessus de l'Europe observées par Sentinel-4 le 8 octobre 2025, mettant en évidence des niveaux élevés au-dessus des Balkans, de la Bulgarie et de la Grèce. (crédits Copernicus Sentinel data (2025), processed by DLR/ESA)
ALT Points chauds de pollution en dioxyde d’azote (NO₂) troposphérique dans la vallée du Pô en Italie (crédit Copernicus)
ALT Cette image présente une colonne verticale de dioxyde de soufre. On peut y observer un panache distinct émergeant de l'Etna, en Italie, et dérivant vers le sud-est au-dessus de la mer. Bien que l'Etna soit actuellement relativement calme, des panaches beaucoup plus importants sont généralement observés lors des périodes d'activité volcanique intense. Outre les émissions naturelles des volcans, le dioxyde de soufre est également libéré par les activités humaines, notamment par les navires brûlant des carburants à haute teneur en soufre et les centrales électriques utilisant du lignite. (crédit Copernicus)
ALT Cette image de l'Europe et d'une partie de l'Afrique du Nord est basée sur les premiers spectres de radiance terrestre mesurés par Sentinel-4. L'image en fausses couleurs, générée en attribuant les signaux de gammes spectrales spécifiques au rouge, au vert et au bleu, montre les terres, l'océan et les nuages comme prévu (crédit Copernicus)
ALT The new Copernicus Sentinel-4 mission has delivered its first images, highlighting concentrations of atmospheric nitrogen dioxide, sulphur dioxide and ozone. Despite being preliminary, these images mark a major milestone in Europe’s ability to monitor air quality all the way from geostationary orbit, 36 000 kilometres above Earth. This image depicts tropospheric nitrogen dioxide with clear pollution hotspots visible along the Mediterranean coast and over Italy’s Po Valley.
ALT This image presents a vertical column density of sulphur dioxide. A distinct plume can be seen emerging from Mount Etna in Italy and drifting south-eastwards over the sea. Although Etna is currently relatively calm, much larger plumes are typically observed during periods of heightened volcanic activity. In addition to natural emissions from volcanoes, sulphur dioxide is also released through human activities, particularly from ships burning high-sulphur fuels and power plants using brown coal.
ALT This image shows a vertical column of ozone. While ozone high up in the stratosphere plays a crucial role in shielding life on Earth from harmful ultraviolet radiation, ozone in the lower atmosphere acts as a pollutant, contributing to poor air quality and respiratory problems. The overall ozone levels here are within the expected range.
ALT This image of Europe and part of North Africa is based on the first Earth radiance spectra measured by Sentinel-4. The false-colour image, generated by assigning the signals in specific spectral ranges to red, green and blue, shows the land, ocean and clouds as expected.
ALT Il satellite MTG-S1 all'interno dell'ogiva, o fairing, del razzo-vettire Falcon 9: le due metà dell'ogiva sono ancora aperte e ci consentono di vedere il satellite.
ALT Il razzo Falcon 9, con all'interno il satellite MTG-S1 e lo strumento Sentinel-4, viene trasportato su ruota verso la rampa di lancio.
ALT Una rappresentazione del satellite Sentinel-4 su MTG-S. Lo sfondo dell'immagine è nero. Il satellite è prevalentemente di colore scuro come pure i pannelli, dispiegati.
