{"id":241,"date":"2026-10-02T17:45:03","date_gmt":"2026-10-02T15:45:03","guid":{"rendered":"https:\/\/lemondeautrement.fr\/?p=241"},"modified":"2026-10-02T17:45:06","modified_gmt":"2026-10-02T15:45:06","slug":"le-trou-dans-la-couche-dozone-ou-en-sommes-nous-aujourdhui","status":"publish","type":"post","link":"https:\/\/lemondeautrement.fr\/?p=241","title":{"rendered":"Le trou dans la couche d\u2019ozone : o\u00f9 en sommes-nous aujourd\u2019hui ?"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\"><img width=\"900\" height=\"342\" class=\"wp-image-242\" style=\"width: 900px;\"  alt=\"\" loading=\"eager\" fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/lemondeautrement.fr\/wp-content\/uploads\/2026\/10\/Le-trou-dozone-au-dessus-de-lAntarctique.png\" srcset=\"https:\/\/lemondeautrement.fr\/wp-content\/uploads\/2026\/10\/Le-trou-dozone-au-dessus-de-lAntarctique.png 2033w, https:\/\/lemondeautrement.fr\/wp-content\/uploads\/2026\/10\/Le-trou-dozone-au-dessus-de-lAntarctique-300x114.png 300w, https:\/\/lemondeautrement.fr\/wp-content\/uploads\/2026\/10\/Le-trou-dozone-au-dessus-de-lAntarctique-1024x389.png 1024w, https:\/\/lemondeautrement.fr\/wp-content\/uploads\/2026\/10\/Le-trou-dozone-au-dessus-de-lAntarctique-768x292.png 768w, https:\/\/lemondeautrement.fr\/wp-content\/uploads\/2026\/10\/Le-trou-dozone-au-dessus-de-lAntarctique-1536x584.png 1536w, https:\/\/lemondeautrement.fr\/wp-content\/uploads\/2026\/10\/Le-trou-dozone-au-dessus-de-lAntarctique-1105x420.png 1105w, https:\/\/lemondeautrement.fr\/wp-content\/uploads\/2026\/10\/Le-trou-dozone-au-dessus-de-lAntarctique-150x57.png 150w, https:\/\/lemondeautrement.fr\/wp-content\/uploads\/2026\/10\/Le-trou-dozone-au-dessus-de-lAntarctique-696x265.png 696w, https:\/\/lemondeautrement.fr\/wp-content\/uploads\/2026\/10\/Le-trou-dozone-au-dessus-de-lAntarctique-1068x406.png 1068w, https:\/\/lemondeautrement.fr\/wp-content\/uploads\/2026\/10\/Le-trou-dozone-au-dessus-de-lAntarctique-1920x730.png 1920w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Pendant plusieurs d\u00e9cennies, le \u00ab trou dans la couche d\u2019ozone \u00bb a \u00e9t\u00e9 l\u2019un des grands probl\u00e8mes environnementaux de la plan\u00e8te. Pourtant, contrairement \u00e0 beaucoup d\u2019autres crises \u00e9cologiques, son histoire montre qu\u2019une action internationale peut r\u00e9ellement inverser une tendance.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Une d\u00e9couverte inqui\u00e9tante<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La couche d\u2019ozone se situe dans la stratosph\u00e8re, \u00e0 plusieurs dizaines de kilom\u00e8tres au-dessus de nos t\u00eates. Elle joue un r\u00f4le essentiel : elle absorbe une grande partie des rayons ultraviolets dangereux \u00e9mis par le Soleil.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dans les ann\u00e9es 1970 et 1980, les scientifiques d\u00e9couvrent que certaines substances chimiques utilis\u00e9es dans les a\u00e9rosols, les r\u00e9frig\u00e9rateurs, les climatiseurs et les mousses industrielles peuvent atteindre la stratosph\u00e8re. Les chlorofluorocarbures, ou CFC, lib\u00e8rent alors du chlore et du brome capables de d\u00e9truire les mol\u00e9cules d\u2019ozone.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le ph\u00e9nom\u00e8ne devient particuli\u00e8rement spectaculaire au-dessus de l\u2019Antarctique, o\u00f9 appara\u00eet chaque printemps austral une vaste zone de tr\u00e8s faible concentration d\u2019ozone : le fameux \u00ab trou \u00bb.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Le tournant du protocole de Montr\u00e9al<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Face \u00e0 cette menace, les pays adoptent en 1987 le <strong>Protocole de Montr\u00e9al<\/strong>, qui pr\u00e9voit la r\u00e9duction puis l\u2019\u00e9limination progressive des principales substances responsables de la destruction de l\u2019ozone.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La mesure est particuli\u00e8rement importante parce que ces produits peuvent rester tr\u00e8s longtemps dans l\u2019atmosph\u00e8re. M\u00eame apr\u00e8s leur interdiction, leurs effets continuent donc pendant des d\u00e9cennies.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pr\u00e8s de 99 % des substances r\u00e9glement\u00e9es qui d\u00e9truisaient la couche d\u2019ozone ont d\u00e9sormais \u00e9t\u00e9 progressivement \u00e9limin\u00e9es.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Le trou n\u2019a pas disparu, mais la tendance s\u2019est invers\u00e9e<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Il ne faut toutefois pas imaginer que le trou dans la couche d\u2019ozone a simplement disparu.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Son importance varie encore d&rsquo;une ann\u00e9e \u00e0 l&rsquo;autre, notamment en fonction des temp\u00e9ratures et de la circulation atmosph\u00e9rique autour de l&rsquo;Antarctique. Mais sur plusieurs d\u00e9cennies, la tendance est encourageante.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En 2025, le trou d\u2019ozone antarctique a \u00e9t\u00e9 particuli\u00e8rement peu important : selon la NASA et la NOAA, sa superficie moyenne pendant la p\u00e9riode de septembre-octobre a \u00e9t\u00e9 la <strong>cinqui\u00e8me plus faible depuis 1992<\/strong>. Son maximum quotidien, atteint le 9 septembre, \u00e9tait d&rsquo;environ 22,86 millions de km\u00b2, soit environ 30 % de moins que le maximum historique observ\u00e9 en 2006.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u2019Organisation m\u00e9t\u00e9orologique mondiale confirme \u00e9galement que 2025 fait partie des ann\u00e9es o\u00f9 le trou a \u00e9t\u00e9 le moins important depuis les grandes p\u00e9riodes d&rsquo;appauvrissement observ\u00e9es au d\u00e9but des ann\u00e9es 1990.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Quand la couche d\u2019ozone sera-t-elle compl\u00e8tement r\u00e9tablie ?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Le retour \u00e0 la normale prendra encore du temps. Les substances responsables de la destruction de l\u2019ozone ont une dur\u00e9e de vie tr\u00e8s longue dans l&rsquo;atmosph\u00e8re.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Selon les projections scientifiques de r\u00e9f\u00e9rence, si les politiques actuelles sont maintenues, les concentrations d\u2019ozone devraient retrouver leurs niveaux de 1980 vers <strong>2040 pour la moyenne mondiale<\/strong>, <strong>2045 dans l\u2019Arctique<\/strong> et autour de <strong>2066 au-dessus de l\u2019Antarctique<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ces dates restent des projections et non des \u00e9ch\u00e9ances pr\u00e9cises. Les conditions m\u00e9t\u00e9orologiques et l\u2019\u00e9volution de l\u2019atmosph\u00e8re peuvent modifier l\u2019\u00e9volution du ph\u00e9nom\u00e8ne d\u2019une ann\u00e9e \u00e0 l\u2019autre.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Une histoire environnementale porteuse d\u2019espoir<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">L\u2019histoire de la couche d\u2019ozone est finalement assez particuli\u00e8re. Une d\u00e9gradation mondiale avait \u00e9t\u00e9 identifi\u00e9e, les causes avaient \u00e9t\u00e9 d\u00e9termin\u00e9es, puis les pays ont adopt\u00e9 des mesures communes pour supprimer progressivement les substances responsables.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Aujourd\u2019hui, les observations montrent que la couche d\u2019ozone est en voie de reconstitution. Le trou antarctique existe toujours, mais son \u00e9volution \u00e0 long terme est compatible avec une lente r\u00e9cup\u00e9ration.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u2019est aussi un rappel important : certains probl\u00e8mes environnementaux peuvent \u00eatre extr\u00eamement longs \u00e0 r\u00e9soudre. M\u00eame lorsque les \u00e9missions sont fortement r\u00e9duites, l\u2019atmosph\u00e8re continue de porter pendant des d\u00e9cennies les cons\u00e9quences des produits utilis\u00e9s dans le pass\u00e9.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u00c0 retenir<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Le trou dans la couche d\u2019ozone n\u2019a pas encore disparu, mais la tendance s\u2019est invers\u00e9e.<\/strong> Gr\u00e2ce notamment au Protocole de Montr\u00e9al, les substances responsables de sa destruction diminuent et la couche d\u2019ozone devrait progressivement retrouver son \u00e9tat d\u2019avant les grandes perturbations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u2019ozone nous offre ainsi un exemple concret d\u2019un probl\u00e8me environnemental mondial pour lequel la science, la surveillance et la coop\u00e9ration internationale ont permis d\u2019obtenir des r\u00e9sultats mesurables.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Sources<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Organisation m\u00e9t\u00e9orologique mondiale (OMM), <em>Ozone and UV Bulletin<\/em>, 2026.<\/li>\n\n\n\n<li>NASA \/ NOAA, <em>2025 Ozone Hole Update<\/em>.<\/li>\n\n\n\n<li>Programme des Nations unies pour l\u2019environnement (PNUE), <em>Scientific Assessment of Ozone Depletion: 2022<\/em>.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><\/h3>\n","protected":false},"excerpt":{"rendered":"<p>Pendant plusieurs d\u00e9cennies, le \u00ab trou dans la couche d\u2019ozone \u00bb a \u00e9t\u00e9 l\u2019un des grands probl\u00e8mes environnementaux de la plan\u00e8te. Pourtant, contrairement \u00e0 beaucoup d\u2019autres crises \u00e9cologiques, son histoire montre qu\u2019une action internationale peut r\u00e9ellement inverser une tendance. Une d\u00e9couverte inqui\u00e9tante La couche d\u2019ozone se situe dans la stratosph\u00e8re, \u00e0 plusieurs dizaines de kilom\u00e8tres [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":242,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,14],"tags":[],"class_list":["post-241","post","type-post","status-publish","format-standard","has-post-thumbnail","category-planete-environnement","category-sciences"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Le trou dans la couche d\u2019ozone : o\u00f9 en sommes-nous aujourd\u2019hui ? - Le Monde autrement<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lemondeautrement.fr\/?p=241\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Le trou dans la couche d\u2019ozone : o\u00f9 en sommes-nous aujourd\u2019hui ? - Le Monde autrement\" \/>\n<meta property=\"og:description\" content=\"Pendant plusieurs d\u00e9cennies, le \u00ab trou dans la couche d\u2019ozone \u00bb a \u00e9t\u00e9 l\u2019un des grands probl\u00e8mes environnementaux de la plan\u00e8te. 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