{"id":15593,"date":"2021-12-09T13:08:01","date_gmt":"2021-12-09T12:08:01","guid":{"rendered":"https:\/\/www.m-q.ch\/?p=15593"},"modified":"2021-12-14T14:02:22","modified_gmt":"2021-12-14T13:02:22","slug":"mal-ventile-contagion-plus-elevee","status":"publish","type":"post","link":"https:\/\/www.m-q.ch\/fr\/mal-ventile-contagion-plus-elevee\/","title":{"rendered":"Mauvaise a\u00e9ration - contagion plus \u00e9lev\u00e9e"},"content":{"rendered":"<figure id=\"attachment_15594\" aria-describedby=\"caption-attachment-15594\" style=\"width: 963px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-15594\" src=\"https:\/\/www.m-q.ch\/wp-content\/uploads\/2021\/12\/Covid.jpg\" alt=\"Contagion\" width=\"963\" height=\"561\" srcset=\"https:\/\/www.m-q.ch\/wp-content\/uploads\/2021\/12\/Covid.jpg 963w, https:\/\/www.m-q.ch\/wp-content\/uploads\/2021\/12\/Covid-768x447.jpg 768w, https:\/\/www.m-q.ch\/wp-content\/uploads\/2021\/12\/Covid-16x9.jpg 16w, https:\/\/www.m-q.ch\/wp-content\/uploads\/2021\/12\/Covid-300x175.jpg 300w, https:\/\/www.m-q.ch\/wp-content\/uploads\/2021\/12\/Covid-601x350.jpg 601w, https:\/\/www.m-q.ch\/wp-content\/uploads\/2021\/12\/Covid-920x536.jpg 920w\" sizes=\"auto, (max-width: 963px) 100vw, 963px\" \/><figcaption id=\"caption-attachment-15594\" class=\"wp-caption-text\">Travail assidu : des tests de masse Covid et des mesures avec des capteurs de CO2 ont mis en \u00e9vidence un lien entre les infections et la qualit\u00e9 de l'air. Image : iStockphoto<\/figcaption><\/figure>\n<p>Avec 300 CO<sub>2<\/sub>-En collaboration avec des chercheurs de l'Empa, le d\u00e9partement de la sant\u00e9 des Grisons a analys\u00e9 la qualit\u00e9 de l'air dans 150 salles de classe des Grisons. Parall\u00e8lement, le nombre de r\u00e9sultats positifs au test Corona a \u00e9t\u00e9 enregistr\u00e9 dans ces salles de classe. L'\u00e9valuation a montr\u00e9 que les \u00e9l\u00e8ves et le personnel enseignant \u00e9taient plus nombreux \u00e0 contracter le coronavirus dans les salles de classe o\u00f9 l'air \u00e9tait de mauvaise qualit\u00e9 que dans celles qui \u00e9taient r\u00e9guli\u00e8rement a\u00e9r\u00e9es.<\/p>\n<div class=\"std-paragraph-block\">\n<div class=\"std-art-paragraph\">\n<p>Les a\u00e9rosols jouent un r\u00f4le central dans la transmission du Sras-CoV-2 : les personnes qui ont \u00e9t\u00e9 infect\u00e9es par le coronavirus respirent non seulement du CO<sub>2<\/sub>\u00a0\u00e9mettent \u00e9galement des a\u00e9rosols charg\u00e9s de virus. Plus ces a\u00e9rosols circulent dans une pi\u00e8ce, plus le risque que d'autres personnes dans la m\u00eame pi\u00e8ce soient \u00e9galement infect\u00e9es est \u00e9lev\u00e9, surtout si elles restent longtemps dans la pi\u00e8ce. On soup\u00e7onnait donc depuis longtemps que la qualit\u00e9 de l'air dans les salles de classe avait une influence sur le nombre de contaminations dans les \u00e9coles. Le projet pilote men\u00e9 dans les Grisons d\u00e9montre pour la premi\u00e8re fois ce lien de mani\u00e8re empirique et statistique.<\/p>\n<\/div>\n<\/div>\n<h2>La mauvaise qualit\u00e9 de l'air nuit \u00e0 l'apprentissage<\/h2>\n<div class=\"std-paragraph-block\">\n<div class=\"std-art-paragraph\">\n<p>La qualit\u00e9 de l'air est mesur\u00e9e depuis octobre 2021 dans 150 salles de classe de 59 \u00e9coles primaires des Grisons. Pour chaque pi\u00e8ce, deux capteurs de CO<sub>2<\/sub>-ont \u00e9t\u00e9 install\u00e9s. Une premi\u00e8re \u00e9valuation, portant sur les donn\u00e9es collect\u00e9es entre le 1er et le 19 novembre 2021, est d\u00e9sormais disponible. Elle a permis d'\u00e9tablir un lien statistique entre le nombre de cas dans les tests scolaires hebdomadaires et les \u00e9missions de CO<sub>2<\/sub>-a \u00e9t\u00e9 observ\u00e9e dans la salle de classe correspondante : Dans les salles de classe mal ventil\u00e9es, le nombre de personnes infect\u00e9es par le Sras-CoV-2 \u00e9tait significativement plus \u00e9lev\u00e9.<\/p>\n<p>Les \u00e9missions de CO<sub>2<\/sub>-montrent en outre que la majorit\u00e9 des salles de classe consid\u00e9r\u00e9es pr\u00e9sentent des valeurs \u00e9lev\u00e9es. Dans 60 % des salles de classe, la concentration de CO<sub>2<\/sub>-sup\u00e9rieure \u00e0 2000 ppm (parties par million). Des niveaux \u00e9lev\u00e9s de CO<sub>2<\/sub>-Les concentrations d'alcool dans le sang peuvent alt\u00e9rer les performances cognitives et donc la capacit\u00e9 d'apprentissage.<\/p>\n<\/div>\n<\/div>\n<p><em>Communiqu\u00e9 de presse de l'Empa<\/em><\/p>\n<p>&nbsp;<\/p>\n<blockquote>\n<p>D\u00e9tails de l'\u00e9tude<\/p>\n<p>Comme les \u00e9missions de CO<sub>2<\/sub>-dans les espaces int\u00e9rieurs avec la transmission de maladies par l'air respir\u00e9 n'avait pas encore \u00e9t\u00e9 prouv\u00e9e empiriquement. Dans la phase pilote des \u00e9tudes actuellement en cours, le service de la sant\u00e9 publique des Grisons a donc fait installer dans environ 150 salles de classe de 59 \u00e9coles de tout le canton des capteurs qui mesurent le CO<sub>2<\/sub>-deux par deux, afin d'assurer la fiabilit\u00e9 des mesures. Ils ont enregistr\u00e9 en continu les concentrations de CO2 et d'autres donn\u00e9es telles que la temp\u00e9rature et la pression atmosph\u00e9rique, tandis que des tests de masse Corona \u00e9taient effectu\u00e9s chaque semaine aupr\u00e8s des \u00e9l\u00e8ves et des enseignants.<\/p>\n<p>Les r\u00e9sultats pr\u00e9liminaires se basent sur les donn\u00e9es mesur\u00e9es entre le 1er et le 19 novembre. Le nombre d'infections pour 100 \u00e9l\u00e8ves, appel\u00e9 pr\u00e9valence, a \u00e9t\u00e9 corr\u00e9l\u00e9 \u00e0 la concentration de CO<sub>2<\/sub>-dans les salles de classe. Dans les \u00e9coles \u00e0 haut risque, elle d\u00e9passait souvent 3'000 ppm (parties par million) - une valeur tr\u00e8s nettement sup\u00e9rieure \u00e0 la teneur recommand\u00e9e de 1'000 ppm au maximum.<\/p>\n<p>Afin d'\u00e9valuer la d\u00e9pendance entre les infections et le CO<sub>2<\/sub>-Toutefois, les statistiques ne suffisent pas \u00e0 elles seules \u00e0 d\u00e9crire avec pr\u00e9cision la teneur en carbone d'un produit. De plus, l'analyse des chercheurs de l'Empa est soumise \u00e0 certaines restrictions. Ainsi, outre les \u00e9missions \"cumul\u00e9es\" de CO<sub>2<\/sub>La mesure de la teneur en oxyg\u00e8ne, c'est-\u00e0-dire la quantit\u00e9 totale de gaz, pourrait fournir d'autres indicateurs du risque d'exposition aux a\u00e9rosols infectieux.<\/p>\n<p>C'est pourquoi les experts vont encore utiliser d'autres variables des \u00e9missions de CO<sub>2<\/sub>-comme la variation de la concentration dans le temps et les changements de temp\u00e9rature, dans le but d'identifier d'\u00e9ventuelles d\u00e9pendances entre la pr\u00e9valence et les concentrations de CO<sub>2<\/sub>-de trouver des solutions.<\/p>\n<\/blockquote>","protected":false},"excerpt":{"rendered":"<p>En collaboration avec des chercheurs de l'Empa, le service de la sant\u00e9 publique des Grisons a analys\u00e9 la qualit\u00e9 de l'air dans 150 salles de classe des Grisons \u00e0 l'aide de 300 capteurs de CO2. Parall\u00e8lement, le nombre de r\u00e9sultats positifs au test Corona a \u00e9t\u00e9 enregistr\u00e9 dans ces salles de classe. L'\u00e9valuation a montr\u00e9 que dans les salles de classe o\u00f9 la qualit\u00e9 de l'air \u00e9tait mauvaise, les \u00e9l\u00e8ves et le personnel enseignant \u00e9taient plus nombreux \u00e0 contracter le coronavirus que dans les salles o\u00f9 l'air \u00e9tait r\u00e9guli\u00e8rement [...].<\/p>","protected":false},"author":35,"featured_media":15594,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4448],"tags":[5190],"class_list":["post-15593","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-allgemein","tag-luftqualitaet"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Schlecht gel\u00fcftet \u2013 h\u00f6here Ansteckung - MQ Management und Qualit\u00e4t<\/title>\n<meta name=\"description\" content=\"Die Luftqualit\u00e4t in Innenr\u00e4umen hat einen Einfluss darauf, wie viele Ansteckungen mit dem Coronavirus dort stattfinden.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.m-q.ch\/fr\/mal-ventile-contagion-plus-elevee\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Schlecht gel\u00fcftet \u2013 h\u00f6here Ansteckung - 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