{"id":260,"date":"2017-10-22T21:27:03","date_gmt":"2017-10-22T19:27:03","guid":{"rendered":"http:\/\/vieagrenoble.fr\/?p=260"},"modified":"2017-11-01T11:54:34","modified_gmt":"2017-11-01T09:54:34","slug":"fakenews-3-reference","status":"publish","type":"post","link":"https:\/\/vieagrenoble.fr\/index.php\/2017\/10\/22\/fakenews-3-reference\/","title":{"rendered":"#Fakenews #3 &#8211; Quelle est la r\u00e9f\u00e9rence ?"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Pour ceux qui nous suivent, vous savez que l&rsquo;on <\/span><a href=\"http:\/\/vieagrenoble.fr\/index.php\/2017\/10\/05\/observatoire-qualite-de-lair-septembre-2017\/\"><span style=\"font-weight: 400;\">observe mensuellement<\/span><\/a><span style=\"font-weight: 400;\"> les donn\u00e9es de pollution t\u00e9l\u00e9chargeables sur le site d&rsquo;<\/span><a href=\"http:\/\/www.air-rhonealpes.fr\/donnees\/telecharger\"><span style=\"font-weight: 400;\">Air Auvergne-Rh\u00f4ne-Alpes<\/span><\/a><span style=\"font-weight: 400;\">. Le r\u00e9cent communiqu\u00e9 de presse de \u201cGrenoble \u00e0 C\u0153ur\u201d nous a interpell\u00e9 avec son graphique apportant la preuve <em>indiscutable<\/em> de l\u2019augmentation de la pollution du fait du nouveau plan de circulation \u00e0 Grenoble&#8230;<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">L&rsquo;\u00e9volution mensuelle du NO<sub>2<\/sub> depuis 10 ans \u00e0 la station Grands Boulevards<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Comme \u201cGrenoble \u00e0 C\u0153ur\u201d, prenons les donn\u00e9es disponibles sur la station Grands Boulevards et suivons la m\u00eame m\u00e9thodologie. Avec les donn\u00e9es mensuelles, on peut observer 2017 (losanges bleus) en comparaison des mesures mensuelles de 2007 \u00e0 2016 et de la moyenne des mesures de 2007 \u00e0 2016 (pointill\u00e9 rouge).<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-281 aligncenter\" src=\"http:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/10-ans-mensuel-et-moyenne.png\" alt=\"10 ans mensuel Grands Boulevards et moyenne\" width=\"800\" height=\"447\" srcset=\"https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/10-ans-mensuel-et-moyenne.png 855w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/10-ans-mensuel-et-moyenne-300x168.png 300w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/10-ans-mensuel-et-moyenne-768x429.png 768w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/10-ans-mensuel-et-moyenne-370x207.png 370w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">On retrouve bien la saisonnalit\u00e9 \u00e9t\u00e9\/hiver et les mesures 2017 sont clairement dans le nuage des mesures de 2007 \u00e0 2016 avec m\u00eame certains mois plut\u00f4t en dessous de la moyenne comme <\/span><a href=\"http:\/\/vieagrenoble.fr\/index.php\/2017\/10\/05\/observatoire-qualite-de-lair-septembre-2017\/\"><span style=\"font-weight: 400;\">septembre<\/span><\/a><span style=\"font-weight: 400;\"> et <\/span><a href=\"http:\/\/vieagrenoble.fr\/index.php\/2017\/09\/01\/observatoire-qualite-de-lair-juillet-aout-2017\/\"><span style=\"font-weight: 400;\">juillet<\/span><\/a><span style=\"font-weight: 400;\">. Ceci est coh\u00e9rent avec les mesures d\u00e9j\u00e0 comment\u00e9es dans <a href=\"http:\/\/vieagrenoble.fr\/index.php\/category\/qualite-de-lair\/\">les observatoires mensuels<\/a> que nous r\u00e9alisons et disponibles sur notre site.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">On observe d\u00e9j\u00e0 une premi\u00e8re d\u00e9viation des donn\u00e9es par rapport \u00e0 la figure 3 du r\u00e9cent <\/span><a href=\"https:\/\/drive.google.com\/file\/d\/0ByfNyPgASZbpdlRLNGJRTmhoT3c\/view\"><span style=\"font-weight: 400;\">communiqu\u00e9 de \u201cGrenoble \u00e0 Coeur\u201d<\/span><\/a><span style=\"font-weight: 400;\">, page 4. Avec selon eux une moyenne de 44\u00b5g\/m\u00b3 de <\/span><span style=\"font-weight: 400;\">NO<sub>2<\/sub><\/span><span style=\"font-weight: 400;\">\u00a0alors que les donn\u00e9es Air Auvergne-Rh\u00f4ne-Alpes nous donne 52\u00b5g\/m\u00b3 de <\/span><span style=\"font-weight: 400;\">NO<sub>2<\/sub><\/span><span style=\"font-weight: 400;\">\u00a0en moyenne de 2007 \u00e0 2016 sur la station Grands Boulevards !<\/span><\/p>\n<p><a href=\"http:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/Figure-3-Grenoble-\u00e0-Coeur-19-Octobre.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-266 aligncenter\" src=\"http:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/Figure-3-Grenoble-\u00e0-Coeur-19-Octobre.png\" alt=\"Figure 3 Grenoble \u00e0 C\u0153ur 19 Octobre\" width=\"698\" height=\"447\" srcset=\"https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/Figure-3-Grenoble-\u00e0-Coeur-19-Octobre.png 698w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/Figure-3-Grenoble-\u00e0-Coeur-19-Octobre-300x192.png 300w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/Figure-3-Grenoble-\u00e0-Coeur-19-Octobre-370x237.png 370w\" sizes=\"auto, (max-width: 698px) 100vw, 698px\" \/><\/a><\/p>\n<h3>Cumul annuel de l&rsquo;\u00e9cart \u00e0 la r\u00e9glementation de 40\u00b5g\/m\u00b3<\/h3>\n<p><span style=\"font-weight: 400;\">Continuons avec l\u2019analyse suivante qu\u2019ils ont choisie, c\u2019est \u00e0 dire le cumul jour mesur\u00e9 en comparaison de la limite r\u00e9glementaire de 40\u00b5g\/m\u00b3. On utilise donc les donn\u00e9es journali\u00e8res de Air Auvergne-Rh\u00f4ne-Alpes (toujours disponibles sur leur module de t\u00e9l\u00e9chargement) pour tracer l\u2019\u00e9cart cumul\u00e9 jour au 40\u00b5g\/m\u00b3 r\u00e9glementaire pour 2017 (courbe rouge ci-dessous). Et on le compare \u00e0 l&rsquo;\u00e9cart r\u00e9glementaire cumul\u00e9 jour de la moyenne des mesures de 2007 \u00e0 2016 (courbe bleue ci-dessous).<\/span><a href=\"http:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/Cumul-jour-\u00e9cart-\u00e0-40-N02-Grands-Boulevard.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-268\" src=\"http:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/Cumul-jour-\u00e9cart-\u00e0-40-N02-Grands-Boulevard.png\" alt=\"Cumul jour \u00e9cart \u00e0 40 N02 Grands Boulevard\" width=\"800\" height=\"489\" srcset=\"https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/Cumul-jour-\u00e9cart-\u00e0-40-N02-Grands-Boulevard.png 852w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/Cumul-jour-\u00e9cart-\u00e0-40-N02-Grands-Boulevard-300x183.png 300w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/Cumul-jour-\u00e9cart-\u00e0-40-N02-Grands-Boulevard-768x470.png 768w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/Cumul-jour-\u00e9cart-\u00e0-40-N02-Grands-Boulevard-370x226.png 370w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><span style=\"font-weight: 400;\">La courbe rouge de 2017 est identique \u00e0 celle pr\u00e9sent\u00e9e par \u201cGrenoble \u00e0 C\u0153ur\u201d avec un cumul \u00e0 mi-octobre \u00e0 environ 1800 jour.\u00b5g\/m\u00b3. Par contre, la courbe bleue de r\u00e9f\u00e9rence des 10 derni\u00e8res ann\u00e9es est tr\u00e8s diff\u00e9rente puisque comme \u00e9voqu\u00e9 pr\u00e9c\u00e9demment, leurs donn\u00e9es moyennes sont plus basses \u00e0 44\u00b5g\/m\u00b3 alors que les mesures Air Auvergne-Rh\u00f4ne-Alpes sont en moyenne \u00e0 52\u00b5g\/m\u00b3.<br \/>\n<\/span><span style=\"font-weight: 400;\">D\u2019ailleurs pour \u00e9viter toute ambigu\u00eft\u00e9, <\/span><a href=\"https:\/\/goo.gl\/DE3xL3\"><span style=\"font-weight: 400;\">partageons le tableur<\/span><\/a><span style=\"font-weight: 400;\"> dans lequel nous avons les exportations de donn\u00e9es en provenance de Air Auvergne-Rh\u00f4ne-Alpes et la construction des graphiques. Votre \u0153il critique et les corrections \u00e9ventuelles seront les bienvenues. Nous pouvons aussi commettre des erreurs !<\/span><\/p>\n<h3>Quelle sont donc les donn\u00e9es de r\u00e9f\u00e9rence permettant de comparer 2017 aux 10 ans pass\u00e9es<\/h3>\n<p><span style=\"font-weight: 400;\">Nous avons donc cherch\u00e9 \u00e0 d\u00e9tecter et comprendre la source de l\u2019\u00e9cart des mesures de \u201cGrenoble \u00e0 C\u0153ur\u201d et celles r\u00e9cup\u00e9r\u00e9es sur Air Auvergne-Rh\u00f4ne-Alpes. Une autre station ? Un autre polluant ? Un calcul ? Aucune de nos hypoth\u00e8ses n\u2019a abouti !<\/span><\/p>\n<p><span style=\"font-weight: 400;\">On a donc aussi cherch\u00e9 dans les communiqu\u00e9s \u00ab\u00a0Grenoble \u00e0 C\u0153ur\u00a0\u00bb pr\u00e9c\u00e9dents. Celui du <\/span><a href=\"https:\/\/drive.google.com\/file\/d\/0ByfNyPgASZbpUHNvLVUzOTlseE0\/view\"><span style=\"font-weight: 400;\">28 ao\u00fbt est int\u00e9ressant \u00e0 la page 4<\/span><\/a><span style=\"font-weight: 400;\"> ! L\u2019historique des 10 derni\u00e8res ann\u00e9es avait d\u00e9j\u00e0 \u00e9t\u00e9 utilis\u00e9 sans toutefois le comparer \u00e0 2017. Voil\u00e0 le graphique qui ressemble tr\u00e8s fortement \u00e0 la figure 3 cit\u00e9e plus haut.<\/span><\/p>\n<p><a href=\"http:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/Page-4-Grenoble-\u00e0-Coeur-28-Ao\u00fbt.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-270 aligncenter\" src=\"http:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/Page-4-Grenoble-\u00e0-Coeur-28-Ao\u00fbt.png\" alt=\"Page 4 Grenoble \u00e0 Coeur 28 Ao\u00fbt\" width=\"800\" height=\"480\" srcset=\"https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/Page-4-Grenoble-\u00e0-Coeur-28-Ao\u00fbt.png 803w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/Page-4-Grenoble-\u00e0-Coeur-28-Ao\u00fbt-300x180.png 300w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/Page-4-Grenoble-\u00e0-Coeur-28-Ao\u00fbt-768x461.png 768w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/Page-4-Grenoble-\u00e0-Coeur-28-Ao\u00fbt-370x222.png 370w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><\/p>\n<p><span style=\"font-weight: 400;\">Mais on note des donn\u00e9es l\u00e9g\u00e8rement plus hautes\u2026 Superposons donc les 2 graphiques du 28 ao\u00fbt et du 19 octobre 2017, qui sont d&rsquo;apr\u00e8s \u00ab\u00a0Grenoble \u00e0 C\u0153ur\u00a0\u00bb les mesures Air Auvergne-Rh\u00f4ne-Alpes pour la station Grands Boulevards de 2007 \u00e0 2016 !<\/span><\/p>\n<p><a href=\"http:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/Data-Grenoble-\u00e0-Coeur-Gds-Blvds-offset-10-ans.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-272 aligncenter\" src=\"http:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/Data-Grenoble-\u00e0-Coeur-Gds-Blvds-offset-10-ans.png\" alt=\"Data Grenoble \u00e0 Coeur Gds Blvds offset 10 ans\" width=\"800\" height=\"480\" srcset=\"https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/Data-Grenoble-\u00e0-Coeur-Gds-Blvds-offset-10-ans.png 803w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/Data-Grenoble-\u00e0-Coeur-Gds-Blvds-offset-10-ans-300x180.png 300w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/Data-Grenoble-\u00e0-Coeur-Gds-Blvds-offset-10-ans-768x461.png 768w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/10\/Data-Grenoble-\u00e0-Coeur-Gds-Blvds-offset-10-ans-370x222.png 370w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><\/p>\n<p><span style=\"font-weight: 400;\">On retrouve un \u00e9cart moyen de 8\u00b5g\/m\u00b3 d\u00e9j\u00e0 \u00e9voqu\u00e9 (52-44\u00b5g\/m\u00b3) ! \u00c9tonnant scientifiquement qu\u2019un m\u00eame graphique, provenant d\u2019une m\u00eame source Air Auvergne-Rh\u00f4ne-Alpes, d&rsquo;une m\u00eame station et d&rsquo;un m\u00eame polluant pr\u00e9sente cette similarit\u00e9 d\u00e9cal\u00e9e de 8\u00b5g\/m\u00b3 ! Dans le doute, on privil\u00e9giera l\u2019hypoth\u00e8se d\u2019une erreur humaine&#8230; Il serait donc normal et honn\u00eate\u00a0<\/span><span style=\"font-weight: 400;\">que \u201cGrenoble \u00e0 c\u0153ur\u201d, Place Grenet, qui a publi\u00e9 <\/span><a href=\"https:\/\/www.placegrenet.fr\/2017\/10\/19\/cvcm-grenoble-a-coeur-reclame-campagne-de-mesures-de-qualite-de-lair\"><span style=\"font-weight: 400;\">l\u2019article du communiqu\u00e9 de presse du 19 octobre<\/span><\/a><span style=\"font-weight: 400;\">, ainsi que tous les auteurs vindicatifs des commentaires, reprennent les donn\u00e9es Air Auvergne-Rh\u00f4ne-Alpes et publient leurs donn\u00e9es de r\u00e9f\u00e9rence et leurs tableurs !<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A votre disposition pour en discuter mais <strong>la conclusion \u00ab\u00a0Grenoble \u00e0 C\u0153ur\u00a0\u00bb faite avec des donn\u00e9es non v\u00e9rifi\u00e9es est donc non recevable ! Fakenews !<\/strong><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Pour terminer sur un constat en accord avec \u201cGrenoble \u00e0 C\u0153ur\u201d, oui la m\u00e9tropole grenobloise est pollu\u00e9e au-dessus du seuil r\u00e9glementaire des 40\u00b5g\/m\u00b3 de <\/span><span style=\"font-weight: 400;\">NO<sub>2<\/sub>, et\u00a0<\/span><span style=\"font-weight: 400;\">cela depuis les 10 derni\u00e8res ann\u00e9es. 2017 n\u2019\u00e9chappe pas \u00e0 cette observation ! Par contre au fil des ann\u00e9es on constate une diminution du niveau de pollution, certainement li\u00e9e au travail et la r\u00e9glementation faits pour influencer la baisse de l\u2019usage de la voiture, la baisse d&rsquo;\u00e9missions de pollutions industrielles et l&rsquo;incitation \u00e0 l\u2019usage d\u2019un chauffage bois propre. Cette baisse est d&rsquo;ailleurs constat\u00e9e sur 10 ans dans le\u00a0<a href=\"http:\/\/www.air-rhonealpes.fr\/sites\/ra\/files\/atoms\/files\/dp2017_bilanqa2016_zoom38_isere.pdf\">rapport 2016<\/a>\u00a0Air Auvergne Rh\u00f4ne-Alpes,\u00a0<\/span><span style=\"font-weight: 400;\">\u00a73 p. 21.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Continuons donc la sensibilisation de tous et l\u2019effort r\u00e9glementaire pour diminuer l\u2019\u00e9mission des polluants par tous. On pourrait alors repasser en-dessous des 40\u00b5g\/m\u00b3 de <\/span><span style=\"font-weight: 400;\">NO<sub>2<\/sub><\/span><span style=\"font-weight: 400;\">\u00a0pour la bonne sant\u00e9 de chacun !<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pour ceux qui nous suivent, vous savez que l&rsquo;on observe mensuellement les donn\u00e9es de pollution t\u00e9l\u00e9chargeables sur le site d&rsquo;Air Auvergne-Rh\u00f4ne-Alpes. Le r\u00e9cent communiqu\u00e9 de presse de \u201cGrenoble \u00e0 C\u0153ur\u201d nous a interpell\u00e9 avec son[&#8230;]<\/p>\n","protected":false},"author":2,"featured_media":263,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[6],"tags":[22,21,7,23],"class_list":["post-260","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-urbanisation","tag-fakenews","tag-cvcm","tag-grenoble","tag-qualite-de-lair"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>#Fakenews #3 - Quelle est la r\u00e9f\u00e9rence ? - Vie \u00e0 Grenoble<\/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:\/\/vieagrenoble.fr\/index.php\/2017\/10\/22\/fakenews-3-reference\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"#Fakenews #3 - Quelle est la r\u00e9f\u00e9rence ? - Vie \u00e0 Grenoble\" \/>\n<meta property=\"og:description\" content=\"Pour ceux qui nous suivent, vous savez que l&rsquo;on observe mensuellement les donn\u00e9es de pollution t\u00e9l\u00e9chargeables sur le site d&rsquo;Air Auvergne-Rh\u00f4ne-Alpes. 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