{"id":5600,"date":"2026-02-06T20:07:01","date_gmt":"2026-02-06T20:07:01","guid":{"rendered":"https:\/\/infos-media-nantes.fr\/?p=5600"},"modified":"2026-02-06T20:07:01","modified_gmt":"2026-02-06T20:07:01","slug":"chantiers-de-latlantique-pollution-saint-nazaire","status":"publish","type":"post","link":"https:\/\/infos-media-nantes.fr\/chantiers-de-latlantique-pollution-saint-nazaire\/","title":{"rendered":"\u00c0 Saint-Nazaire, les Chantiers de l\u2019Atlantique sous pression face aux pollutions industrielles"},"content":{"rendered":"\n<article id=\"imn-chantiers-atlantique-2026\" style=\"font-family:Inter,Arial,sans-serif;color:#222;line-height:1.65;max-width:1100px;margin:auto;padding:24px;background:#fff;box-sizing:border-box;\">\n\n<header>\n  <p>\n    Une enqu\u00eate men\u00e9e par <a href=\"https:\/\/www.mediacites.fr\/enquete\/nantes\/2026\/02\/05\/les-chantiers-de-latlantique-a-saint-nazaire-une-entreprise-florissante-qui-pollue-en-toute-discretion\/\">M\u00e9diacit\u00e9s<\/a>, en partenariat avec <a href=\"https:\/\/infos-media-nantes.fr\/splann-media-enquete-bretagne\/\">Splann !<\/a>, met en lumi\u00e8re les impacts environnementaux persistants des Chantiers de l\u2019Atlantique. Rejets dans l\u2019air, le sol et les eaux souterraines, \u00e9missions diffuses massives et opacit\u00e9 sur certaines activit\u00e9s de soudure et de peinture soul\u00e8vent de fortes inqui\u00e9tudes parmi les riverains nazairiens.\n  <\/p>\n  <p>\n    Symbole de la r\u00e9ussite industrielle fran\u00e7aise, les Chantiers s\u2019appr\u00eatent \u00e0 livrer fin mars l\u2019Orient Express Corinthian, pr\u00e9sent\u00e9 comme le plus grand yacht \u00e0 voiles du monde. Avec ses 220 m\u00e8tres de long et ses 54 suites de luxe, le navire est promu comme un mod\u00e8le de r\u00e9duction des \u00e9missions de CO\u2082. Pourtant, cette vitrine technologique contraste avec une r\u00e9alit\u00e9 plus pr\u00e9occupante sur le site de production.\n  <\/p>\n  <p>\n    Le carnet de commandes ne cesse de se remplir. En 2025, cinq navires ont \u00e9t\u00e9 achet\u00e9s pour un total de 7 milliards d\u2019euros, suivis fin janvier par six nouvelles commandes. Parall\u00e8lement, l\u2019entreprise accumule des contrats de sous-stations \u00e9lectriques pour l\u2019\u00e9olien en mer et de navires militaires, dont le futur successeur du porte-avion Charles de Gaulle attendu pour 2038. Cette activit\u00e9 soutenue implique davantage de d\u00e9coupe de m\u00e9tal, de soudage et de peinture, autant de proc\u00e9d\u00e9s g\u00e9n\u00e9rant des fum\u00e9es potentiellement dangereuses contenant des particules m\u00e9talliques et des compos\u00e9s organiques volatils.\n  <\/p>\n<\/header>\n\n<section>\n  <h2>Des \u00e9missions diffuses largement majoritaires<\/h2>\n  <p>\n    Selon la pr\u00e9fecture, plus de 90 % des \u00e9missions totales du site en 2024 \u00e9taient des \u00e9missions diffuses, principalement \u00e0 bord des navires en fin de construction. Cette situation est d\u2019autant plus sensible que le site jouxte le quartier de M\u00e9an-Penho\u00ebt, o\u00f9 les habitants vivent \u00e0 proximit\u00e9 imm\u00e9diate des installations.\n  <\/p>\n  <p>\n    Christian Qu\u00e9lard, pr\u00e9sident de l\u2019association Vivre \u00e0 M\u00e9an-Penho\u00ebt, rappelle qu\u2019une digue anti-bruit avait \u00e9t\u00e9 \u00e9rig\u00e9e pour limiter les nuisances. Elle n\u2019a toutefois jamais emp\u00each\u00e9 les retomb\u00e9es de fum\u00e9es de soudage, visibles parfois sous forme de traces de peinture sur les v\u00e9hicules. Entre 2021 et aujourd\u2019hui, les rejets de COV sont pass\u00e9s de 170 tonnes \u00e0 une projection de 600 tonnes annuelles.\n  <\/p>\n  <p>\n    Face \u00e0 ces constats, l\u2019\u00c9tat a exig\u00e9 la mise en place d\u2019un programme de surveillance environnementale renforc\u00e9. Les Chantiers doivent d\u00e9sormais mesurer autour du site les concentrations de quatre COV et de trois m\u00e9taux, dont le chrome VI, class\u00e9 canc\u00e9rog\u00e8ne. Des contr\u00f4les des eaux souterraines sont \u00e9galement impos\u00e9s pour d\u00e9tecter hydrocarbures, BTEX et autres polluants.\n  <\/p>\n<\/section>\n\n<section>\n  <h2>Un suivi environnemental jug\u00e9 insuffisant<\/h2>\n  <p>\n    Si la pr\u00e9fecture se f\u00e9licite d\u2019un \u00e9largissement des polluants surveill\u00e9s, plusieurs acteurs contestent la pertinence du dispositif. La CGT d\u00e9nonce des ateliers de sous-traitants o\u00f9 les fum\u00e9es ne seraient pas aspir\u00e9es correctement, tandis que la CFDT regrette d\u2019avoir \u00e9t\u00e9 \u00e9cart\u00e9e du programme de suivi.\n  <\/p>\n  <p>\n    Ce programme repose sur un rapport du cabinet Dekra, dont la m\u00e9thodologie est critiqu\u00e9e par Air Pays de la Loire. Le document omet notamment des donn\u00e9es essentielles sur les installations de combustion, excluant de facto plusieurs polluants majeurs du p\u00e9rim\u00e8tre de surveillance. Pour les syndicats, cette lacune est pr\u00e9occupante, car les navires fonctionnent au fioul lorsqu\u2019ils sont \u00e0 quai.\n  <\/p>\n  <p>\n    Didier Ott, sp\u00e9cialiste des pollutions industrielles, estime que l\u2019\u00e9tude sous-estime gravement les risques sanitaires, en minimisant les \u00e9missions de COV et de substances canc\u00e9rog\u00e8nes. Interrog\u00e9s, les Chantiers n\u2019ont pas souhait\u00e9 commenter ces critiques, tandis que Dekra juge les risques acceptables selon ses mod\u00e8les.\n  <\/p>\n<\/section>\n\n<section>\n  <h2>Une gestion contest\u00e9e des d\u00e9chets dangereux<\/h2>\n  <p>\n    Des diagnostics de 2020 et 2022 ont r\u00e9v\u00e9l\u00e9 pr\u00e8s de 5 990 m\u00e8tres cubes de terres pollu\u00e9es par des hydrocarbures, BTEX, PCB et m\u00e9taux. Leur \u00e9vacuation en d\u00e9cembre 2024 sans information pr\u00e9alable des autorit\u00e9s constitue une infraction au code de l\u2019environnement, selon la Dreal.\n  <\/p>\n  <p>\n    Enfin, les Chantiers ont cess\u00e9 en 2023 de verser la taxe g\u00e9n\u00e9rale sur les activit\u00e9s polluantes \u00e0 Air Pays de la Loire, contrairement \u00e0 la majorit\u00e9 des industriels locaux. Ce choix, jamais justifi\u00e9 publiquement, prive l\u2019organisme de moyens suppl\u00e9mentaires pour renforcer la surveillance de la qualit\u00e9 de l\u2019air.\n  <\/p>\n<\/section>\n\n<!-- =========================================================\n     MINI-JEU IMN : MOTS M\u00caL\u00c9S \u2014 CHANTIERS DE L\u2019ATLANTIQUE\n     Mod\u00e8le officiel Momele-IMN \u2014 VERSION MOBILE-FIRST CORRIG\u00c9E\n========================================================= -->\n\n<section>\n  <h2>Mini-jeu IMN : retrouve les mots cach\u00e9s des Chantiers<\/h2>\n\n  <p id=\"imn-wordlist-chantiers\" style=\"font-weight:bold;color:#5532F0;margin-bottom:14px;\"><\/p>\n\n  <button id=\"imn-newgame-btn\" class=\"imn-btn\" style=\"display:block;margin:15px auto 20px;\">\n    Nouvelle partie\n  <\/button>\n\n  <div id=\"imn-wordgrid-chantiers\"\n       style=\"\n         width:100%;\n         max-width:min(92vw, 420px);\n         margin:20px auto;\n         padding:0 6px;\n         display:grid;\n    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Tous les mots ont \u00e9t\u00e9 trouv\u00e9s.\";\n            imnTrack(\"wordsearch_complete\",{context:\"chantiers_atlantique\"});\n          }\n        });\n      }\n\n      document.addEventListener(\"DOMContentLoaded\",()=>{\n        document.getElementById(\"imn-newgame-btn\").addEventListener(\"click\",imnNewGridChantiers);\n        imnNewGridChantiers();\n      });\n    })();\n  <\/script>\n<\/section>\n\n<\/article>\n\n<section id=\"imn-sources\" style=\"max-width:1100px;margin:20px auto;padding:0 24px;\">\n  <h2>Sources<\/h2>\n  <ul>\n    <li><a href=\"https:\/\/www.mediacites.fr\/enquete\/nantes\/2026\/02\/05\/les-chantiers-de-latlantique-a-saint-nazaire-une-entreprise-florissante-qui-pollue-en-toute-discretion\/\">M\u00e9diacit\u00e9s, enqu\u00eate du 5 f\u00e9vrier 2026<\/a><\/li>\n    <li><a href=\"https:\/\/infos-media-nantes.fr\/splann-media-enquete-bretagne\/\">Splann !, partenariat d\u2019investigation<\/a><\/li>\n    <li><a href=\"https:\/\/splann.org\/wp-content\/uploads\/2026\/01\/2025.03.14.eval-risk-sanit(Dekra)Cada.pdf\">Rapport Dekra sur l\u2019\u00e9valuation des risques sanitaires<\/a><\/li>\n  <\/ul>\n<\/section>\n\n","protected":false},"excerpt":{"rendered":"<p>Une enqu\u00eate men\u00e9e par M\u00e9diacit\u00e9s, en partenariat avec Splann !, met en lumi\u00e8re les impacts environnementaux persistants des Chantiers de l\u2019Atlantique. Rejets dans l\u2019air, le sol et les eaux souterraines, \u00e9missions diffuses massives et opacit\u00e9 sur certaines activit\u00e9s de soudure et de peinture soul\u00e8vent de fortes inqui\u00e9tudes parmi les riverains nazairiens. Symbole de la r\u00e9ussite [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5601,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":"","event_start_date":"","event_end_date":"","event_location":"","imn_event_city":"","imn_event_start_time":"","imn_event_end_time":"","imn_event_all_day":"","imn_event_address":"","imn_event_ticket_url":"","imn_event_price":"","imn_event_status":"","imn_event_organizer":"","imn_event_accessibility":""},"categories":[22],"tags":[4036,163,4037,1202,4038,4035,3541,166,3223],"class_list":["post-5600","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites-nantes","tag-air-pays-de-la-loire","tag-chantiers-de-latlantique","tag-cov","tag-dreal","tag-mediacites-2","tag-pollution-industrielle","tag-qualite-de-lair","tag-saint-nazaire","tag-splann"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - 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