This is the official account for the @ac-saf.eumetsat.int Satellite Application Facility on Atmospheric Composition Monitoring (AC SAF)https://bsky.app/profile/ac-saf.eumetsat.inthttps://bsky.app/profile/ac-saf.eumetsat.int/post/3mg5xqwybbs2m#SaharanDust transport over Northern Africa in recent days has been captured by the GOME-2 (Metop-B and Metop-C) absorbing aerosol index (AAI). #CAMS forecast shows the plume moving over southern and western Europe this week. 🌬️03 Mar 2026 14:22 +0000at://did:plc:l4bzufpbecgw2ioxbl2txaea/app.bsky.feed.post/3mg5xqwybbs2mhttps://bsky.app/profile/ac-saf.eumetsat.int/post/3md36mxs2uc2fGOME-2 (B+C) observations show absorbing aerosol index (AAI) plumes from wildfires over West Africa and west of Chile on 17 and 19 January, extending over the Atlantic and Pacific Oceans. Background: NASA/NOAA-21 VIIRS active fires (past 24 h) in red and GFS 800 hPa winds at 11:00 (from Ventusky).23 Jan 2026 07:31 +0000at://did:plc:l4bzufpbecgw2ioxbl2txaea/app.bsky.feed.post/3md36mxs2uc2fhttps://bsky.app/profile/ac-saf.eumetsat.int/post/3mcwcpfzvhk2yTuuli Perttula takes the stage at #WSW2026 Tailored Satellite-Based Air Quality Products for Operational Weather Forecasting: Turning complex satellite data into intuitive products that support real-time air quality monitoring and forecasting.21 Jan 2026 09:01 +0000at://did:plc:l4bzufpbecgw2ioxbl2txaea/app.bsky.feed.post/3mcwcpfzvhk2yhttps://bsky.app/profile/ac-saf.eumetsat.int/post/3m6kopkzrcs2tA transported SO2 plume from #HailyGubbi on 23-26 November, as seen by the GOME-2 instrument on the MetOp-B and MetOp-C satellites. 🌋 The volcano erupted on 23 November in Afar Region, Ethiopia.26 Nov 2025 20:23 +0000at://did:plc:l4bzufpbecgw2ioxbl2txaea/app.bsky.feed.post/3m6kopkzrcs2thttps://bsky.app/profile/ac-saf.eumetsat.int/post/3m4api2wqc22jEUMETSAT Climate Symposium. Here we are.28 Oct 2025 10:20 +0000at://did:plc:l4bzufpbecgw2ioxbl2txaea/app.bsky.feed.post/3m4api2wqc22jhttps://bsky.app/profile/ac-saf.eumetsat.int/post/3m45zcpgoxs2xHCHO trend over Arabian Peninsula 2005-2023. Measured with GOME-2 instrument. EUMETSAT Climate Symposium starts tomorrow, see us there: https://www.eumetsat.int/eumetsat-climate-symposium-co-creation-action . #formaldehyde #HCHO #EUMETSAT #timeserie #climate27 Oct 2025 08:38 +0000at://did:plc:l4bzufpbecgw2ioxbl2txaea/app.bsky.feed.post/3m45zcpgoxs2xhttps://bsky.app/profile/ac-saf.eumetsat.int/post/3m3wqzgcejs2vEUMETSAT Climate Symposium is on next week, 28-30 Oct. Meet us there. Here is Merged GOME-2 tropospheric NO2 column for Western Europe for the period 01/2007 - 12/2024. #GOME-2 #EUMETSAT #NO2 https://www.eumetsat.int/eumetsat-climate-symposium-co-creation-action24 Oct 2025 11:21 +0000at://did:plc:l4bzufpbecgw2ioxbl2txaea/app.bsky.feed.post/3m3wqzgcejs2vhttps://bsky.app/profile/ac-saf.eumetsat.int/post/3lyd4nzrf222gThe ozone hole that exists every year, but is no longer growing. Proof that international environmental regulations and co-operation, like Montreal protocol, work ! Here we have temperatures in the polar vortex (left), and ozone concentrations (right). Time period 1 Aug - 6 Sep 202508 Sep 2025 11:40 +0000at://did:plc:l4bzufpbecgw2ioxbl2txaea/app.bsky.feed.post/3lyd4nzrf222ghttps://bsky.app/profile/ac-saf.eumetsat.int/post/3lxju4muyv226To extend the life of Metop-B, five satellite maneuvres are planned in September. The first maneuver is planned on Tue 2 Sep, with the following instrument outages (~ 2 orbs): IASI 07:12:41-13:06:45 GOME-2 10:25:24-13:49:13. The nexts are planned for 9, 16, 23 and 30 Sep. Image: ESA/AOES Medialab29 Aug 2025 10:31 +0000at://did:plc:l4bzufpbecgw2ioxbl2txaea/app.bsky.feed.post/3lxju4muyv226https://bsky.app/profile/ac-saf.eumetsat.int/post/3lrpfmmhg7k2vThe #IASI reprocessed #ozone data record is released. Contains both total ozone and ozone profiles data. The EUMETSAT IASI L2 T and H2O are part of the data. Stable, high-quality data for climate studies, consistent with the NRT processing. DOI: 10.15770/EUM_SAF_AC_0051 https://acsaf.org/datarecords/iasi_o3_cdr.php16 Jun 2025 06:56 +0000at://did:plc:l4bzufpbecgw2ioxbl2txaea/app.bsky.feed.post/3lrpfmmhg7k2vhttps://bsky.app/profile/ac-saf.eumetsat.int/post/3lqn2tzldbk2m#Wildfires in #Canada have emitted massive amount #smoke that is clearly visible in GOME-2 (B+C) #AAI observations. Long range transportation over northern #Atlantic. AAI data either from #EUMETCast or SAF archive https://acsaf.org/products/arp.php02 Jun 2025 15:13 +0000at://did:plc:l4bzufpbecgw2ioxbl2txaea/app.bsky.feed.post/3lqn2tzldbk2mhttps://bsky.app/profile/ac-saf.eumetsat.int/post/3lp2k2yxdys2wThe Global 1-day UV Index Forecast is released today. This version have a three-layer cloud cover forecast from ECMWF, which provides cloud cover fractions for low-, medium-, and high-altitude clouds. Clear improvement over the previous single-layer cloud correction. https://acsaf.org/products/nuv.php13 May 2025 12:59 +0000at://did:plc:l4bzufpbecgw2ioxbl2txaea/app.bsky.feed.post/3lp2k2yxdys2whttps://bsky.app/profile/ac-saf.eumetsat.int/post/3lp224rlw522wDid you know that cloud corrected European #UVI and #Erythemal daily dose from EUMETSAT's MSG #SEVIRI (2004-2024) and MTG #FCI (2025->) data are available. 15 min time resolution. Data, maps and #overpasses available. Images and overpasses acsaf.org/euv_validation/index.php13 May 2025 08:14 +0000at://did:plc:l4bzufpbecgw2ioxbl2txaea/app.bsky.feed.post/3lp224rlw522whttps://bsky.app/profile/ac-saf.eumetsat.int/post/3lozzoczpac2wDid you know that cloud corrected European #UVI and #Erythemal daily dose from EUMETSAT's MSG #SEVIRI (2004-2024) and MTG #FCI (2025->) data are available. 15 min time resolution. Data, maps and #overpasses available. Data: https://acsaf.org/products/euv_demo.php , images and overpasses https://acsaf.org/euv_validation/index.php13 May 2025 08:06 +0000at://did:plc:l4bzufpbecgw2ioxbl2txaea/app.bsky.feed.post/3lozzoczpac2whttps://bsky.app/profile/ac-saf.eumetsat.int/post/3lnwzucplcc2wHere are examples of GOME-2 B&C Level 3 Tropospheric NO2 for two African cities, Nairobi and Casablanca, annual mean 2024. NO2 is produced mainly in combustion of fossil fuels (coal, gas and oil) and especially fuel used in cars. Click images to get larger view.29 Apr 2025 10:06 +0000at://did:plc:l4bzufpbecgw2ioxbl2txaea/app.bsky.feed.post/3lnwzucplcc2whttps://bsky.app/profile/ac-saf.eumetsat.int/post/3lkdqt2hs2k2wDirectional #Lambertian-Equivalent #Reflectivity (DLER) version 4.1 is finally released. It has been available as demonstrational product a while, but now we can announce the official release. Added wl, improved errors, directionality and quality. Download and have a try! https://acsaf.org/datarecords/ler.php14 Mar 2025 13:48 +0000at://did:plc:l4bzufpbecgw2ioxbl2txaea/app.bsky.feed.post/3lkdqt2hs2k2whttps://bsky.app/profile/ac-saf.eumetsat.int/post/3lijwehs2ks25@eumetsat.bsky.social SAF Network meeting to plan the next phase for 2027-2032. New products, new services.19 Feb 2025 13:53 +0000at://did:plc:l4bzufpbecgw2ioxbl2txaea/app.bsky.feed.post/3lijwehs2ks25https://bsky.app/profile/ac-saf.eumetsat.int/post/3lhfzzuxjlc24Demonstrational IASI dust optical depth available via EUMETCast. More info and instructions: https://acsaf.org/products/iasi_dust_demo.php05 Feb 2025 07:23 +0000at://did:plc:l4bzufpbecgw2ioxbl2txaea/app.bsky.feed.post/3lhfzzuxjlc24