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This new mission is part of a larger push to understand and track air quality like never before \u2013 not just once a day, but every hour. That\u2019s a huge leap from the old way of doing things.<\/p>\n
How Sentinel-4 sees air pollution<\/p>\n
Most satellites move from pole to pole, scanning different parts of the Earth as the planet spins beneath them. <\/p>\n
Sentinel-4 takes a different approach. It stays in one place, hovering over the same stretch of Earth \u2013 Europe and northern Africa \u2013 from about 22,000 miles up in a geostationary orbit.<\/p>\n
That fixed position lets it keep constant watch and send hourly updates. And that\u2019s important. <\/p>\n
Pollutants<\/a> like nitrogen dioxide, sulfur dioxide, and ozone don\u2019t stay still \u2013 they shift quickly.<\/p>\n Catching those changes in real time helps scientists track how pollution spreads and when it peaks, which is especially important for people with asthma, heart disease, or other health issues.<\/p>\n The satellite collects this data by measuring sunlight that bounces off Earth and its atmosphere. Buried in that light are signals from different gases. <\/p>\n The satellite breaks the light down and picks out those signals, showing what\u2019s in the air and how much of it is there.<\/p>\n And because it\u2019s using ultraviolet, visible, and near-infrared light, it can detect a wide range of harmful substances \u2013 even ones we can\u2019t see or smell.<\/p>\n Monitoring pollution from space<\/p>\n Although Sentinel-4 only launched in July of 2025, it\u2019s already showing signs of strong performance. <\/p>\n The spectrometer is riding along on the Meteosat Third Generation Sounder \u2013 a weather satellite<\/a> \u2013 which helps Europe get more value from a single mission.<\/p>\n ESA<\/a> scientist Ben Veihelmann noted that Sentinel-4 is the first European mission that will deliver hourly air-quality observations.<\/p>\n \u201cBy capturing fast changes in air pollution<\/a>, Sentinel-4 is a game-changer for monitoring and forecasting air quality over Europe.\u201d said Veihelmann.<\/p>\n The satellite is still in its testing phase, but even the first data has scientists excited.<\/p>\n \u201cWe are extremely happy to see these first preliminary results, and my thanks go to everyone involved in the mission,\u201d said Didier Martin, ESA\u2019s Sentinel-4 Project Manager.<\/p>\n \u201cFirstly, and arguably most importantly, they confirm that Sentinel-4 is healthy, and that the calibration and the data processing chains are on track.\u201d<\/p>\n According to Martin, this essentially means that it is well on the road to becoming Europe\u2019s first mission dedicated to delivering hourly measurements of air pollutants across the continent.<\/p>\n What the early images revealed<\/p>\n On October 8, Sentinel-4 captured its first real data. One image showed levels of nitrogen dioxide<\/a> \u2013 a gas mostly released by cars, power plants, and heating systems that burn fossil fuels.<\/p>\n High levels were spotted along the Mediterranean and over northern Italy\u2019s Po Valley. But not everywhere showed up \u2013 clouds can block Sentinel-4\u2019s view of nitrogen dioxide.<\/p>\n One of the early images from Sentinel-4 caught a plume of sulphur dioxide rising off Mount Etna, the volcano in Sicily. <\/p>\n The eruption wasn\u2019t major, but the gas stretched southeast over the sea \u2013 a clear sign that even a relatively quiet volcano can still leave a mark on the atmosphere.<\/p>\n Sulphur dioxide doesn\u2019t only come from volcanoes. It\u2019s also released by ships burning high-sulphur fuel and by coal-fired power plants. It\u2019s a toxic gas on its own and also helps create fine particles that pollute the air and pose serious health risks.<\/p>\n Capturing ozone levels<\/p>\n Sentinel-4 also recorded ozone levels<\/a>. Way up in the stratosphere, ozone shields us from harmful ultraviolet radiation. <\/p>\n But closer to the ground, it becomes a pollutant \u2013 one that can cause breathing problems and worsen conditions like asthma.<\/p>\n The image showed more ozone over the Balkans and Greece, and less over the Baltic region. That pattern lined up with data from other satellites tracking the same day.<\/p>\n The last image wasn\u2019t about pollution. It showed what the satellite sees using false colors, based on the first full spectrum of light coming from Earth. <\/p>\n You could clearly make out land, sea, and clouds \u2013 a good sign that everything is working.<\/p>\n Once Sentinel-4 goes live, it\u2019ll be sending hourly updates on pollutants that affect the air millions breathe every day. <\/p>\n The readings \u2013 including gases like nitrogen dioxide and ozone, along with aerosols<\/a> and other harmful substances \u2013 will help experts stay ahead of changes in air quality.<\/p>\n That stream of data will feed directly into the Copernicus Atmosphere Monitoring Service<\/a>, which is responsible for tracking air pollution across Europe and helping predict when and where conditions might worsen.<\/p>\n \u201cWe are very proud to contribute to this important mission, together with our key partners \u2013 the European Commission and Eumetsat, and our dedicated industrial teams,\u201d said Simonetta Cheli, ESA\u2019s Director of Earth Observation Programmes.<\/p>\n \u201cIt truly demonstrates the power of collaboration. The mission is still in its commissioning phase, but these first results clearly show that everything is functioning well. These initial glimpses are extremely encouraging.\u201d <\/p>\n \u201cWe now look forward to Copernicus Sentinel-4 becoming fully operational in the coming months, and to seeing how its data will enhance air-quality assessments and provide critical input for pollution forecasting,\u201d <\/p>\n \u2014\u2013<\/p>\n Like what you read? Subscribe to our newsletter<\/a> for engaging articles, exclusive content, and the latest updates.\u00a0<\/p>\n Check us out on EarthSnap<\/a>, a free app brought to you by Eric Ralls<\/a> and Earth.com.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"A powerful new satellite called Sentinel-4 just sent back its first images of air pollution over Europe and…\n","protected":false},"author":2,"featured_media":129133,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22],"tags":[242,85,46,141],"class_list":["post-129132","post","type-post","status-publish","format-standard","has-post-thumbnail","category-environment","tag-environment","tag-il","tag-israel","tag-science"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/il\/wp-json\/wp\/v2\/posts\/129132","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/il\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/il\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/il\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/il\/wp-json\/wp\/v2\/comments?post=129132"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/il\/wp-json\/wp\/v2\/posts\/129132\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/il\/wp-json\/wp\/v2\/media\/129133"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/il\/wp-json\/wp\/v2\/media?parent=129132"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/il\/wp-json\/wp\/v2\/categories?post=129132"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/il\/wp-json\/wp\/v2\/tags?post=129132"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"This](\"https:\/\/www.newsbeep.com\/il\/wp-content\/uploads\/2025\/11\/Sentinel-4_tropospheric-nitrogen-dioxide_Italy_ESA_1s.webp.webp\")
<\/a>This Sentinel-4 image depicts tropospheric nitrogen dioxide with clear pollution hotspots visible along the Mediterranean coast and over Italy\u2019s Po Valley. Click image to enlarge. Credit: ESAEarly data points to success<\/p>\n![\"This](\"https:\/\/www.newsbeep.com\/il\/wp-content\/uploads\/2025\/11\/Sentinel-4_sulfer-dioxide_mt-etna_ESA_1s.webp.webp\")
<\/a>This Sentinel-4 image presents a vertical column density of sulfur dioxide. A distinct plume can be seen emerging from Mount Etna in Italy and drifting south-eastwards over the sea. Click image to enlarge. Credit: ESASentinel-4\u2019s real mission starts soon<\/p>\n