{"id":220,"date":"2017-07-20T17:52:04","date_gmt":"2017-07-20T15:52:04","guid":{"rendered":"http:\/\/vieagrenoble.fr\/?p=220"},"modified":"2017-11-01T11:55:19","modified_gmt":"2017-11-01T09:55:19","slug":"fakenews-2-lapproche-scientifique-credibiliser","status":"publish","type":"post","link":"https:\/\/vieagrenoble.fr\/index.php\/2017\/07\/20\/fakenews-2-lapproche-scientifique-credibiliser\/","title":{"rendered":"#Fakenews #2 &#8211; L&rsquo;approche scientifique pour cr\u00e9dibiliser !"},"content":{"rendered":"<p>Apr\u00e8s avoir d\u00e9cortiqu\u00e9 la naissance et cr\u00e9ation d&rsquo;une\u00a0<a href=\"http:\/\/vieagrenoble.fr\/index.php\/2017\/05\/07\/coeurs-de-ville-coeurs-de-metropole-episode-3\/\">#fakenews<\/a>, on recommence avec ce graphique publi\u00e9 par l&rsquo;association \u00ab\u00a0Grenoble \u00e0 c\u0153ur\u00a0\u00bb, des opposants au <a href=\"https:\/\/www.lametro.fr\/83-coeurs-de-ville-coeurs-de-metropole.htm\">projet m\u00e9tropolitain CVCM<\/a> tel que pr\u00e9vu aujourd&rsquo;hui.<\/p>\n<p>Ils utilisent aussi les donn\u00e9es de Air Auvergne Rh\u00f4ne-alpes* pour fabriquer leur conclusion : la pollution augmente largement apr\u00e8s la mise en oeuvre du nouveau plan de circulation ! Vraiment ? Voici leur graphique et regardons la m\u00e9thodologie utilis\u00e9e pour d\u00e9crypter l&rsquo;approximation scientifique.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/4.bp.blogspot.com\/-AjxciUzorLA\/WWoZCLgq8jI\/AAAAAAAABJ0\/3wD599rNs0cGHe6mMakZQzKhgHTgezHgACLcBGAs\/s640\/mesures%2Bpollution%2Bgrands%2Bboulevards.png\" \/><\/p>\n<ul>\n<li>Seulement 2 semaines en Avril servant de mesures de r\u00e9f\u00e9rences. Sont elles des semaines significatives ? Pourquoi pas au moins autant que celles utilis\u00e9es apr\u00e8s ? C&rsquo;est comme si on comparait la temp\u00e9rature du mois de juin, par rapport \u00e0 2 semaines en avril pour conclure que juin est plus chaud qu&rsquo;avril !<\/li>\n<li>Pour se focaliser sur la pollution voiture des jours ouvrables, ils font la moyenne des valeurs entre 7h et 20h. Mais quelle est la vitesse de dispersion du NO\u00b2 ? ne d\u00e9pends t-elle pas des jours et du vent ou pluie ? Ne respirons nous pas aussi la pollution le WE ?<\/li>\n<li>N&rsquo;est gard\u00e9 que certaines semaines pour raison de jours f\u00e9ri\u00e9 d&rsquo;apr\u00e8s l&rsquo;explication, alors qu&rsquo;on regarde des mesures journali\u00e8res seulement des jours ouvr\u00e9s et qu&rsquo;on ne constate pas d&rsquo;effet cumulatif au fil de la semaine. De plus, pouvez vous nous rappeler quel jour f\u00e9ri\u00e9 \u00e9tait la semaine du 29 mai, non pr\u00e9sente dans le graphique ?<\/li>\n<li>Le +35% est mesur\u00e9 sur les points extr\u00eames, sans m\u00eame tenir compte de certains jours ouvr\u00e9s aussi pr\u00e9sent sur le graphique et qui baisserait la moyenne de l&rsquo;augmentation&#8230; Quelle justification ?<\/li>\n<li>Enfin, un d\u00e9tail, mais pour une preuve scientifique c&rsquo;est un peu gros, les mesures sont celles du dioxyde d&rsquo;azote, et non oxyde d&rsquo;azote ! Encore un coup de la fameuse faute de frappe grenobloise !?<\/li>\n<\/ul>\n<p>Autant d&rsquo;observations qui poussent \u00e0 reprendre la m\u00eame m\u00e9thode \u00e0 partir des donn\u00e9es brutes d&rsquo;Air AURA, en gardant toutes les semaines pour obtenir le graphique ci-dessous.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-224\" src=\"http:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/Grd-Blvd-NO2-moyenne-jours-et-heures-ouvr\u00e9s.png\" alt=\"Grd Blvd NO2 moyenne jours et heures ouvr\u00e9s\" width=\"799\" height=\"403\" srcset=\"https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/Grd-Blvd-NO2-moyenne-jours-et-heures-ouvr\u00e9s.png 1146w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/Grd-Blvd-NO2-moyenne-jours-et-heures-ouvr\u00e9s-300x151.png 300w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/Grd-Blvd-NO2-moyenne-jours-et-heures-ouvr\u00e9s-768x387.png 768w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/Grd-Blvd-NO2-moyenne-jours-et-heures-ouvr\u00e9s-1024x516.png 1024w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/Grd-Blvd-NO2-moyenne-jours-et-heures-ouvr\u00e9s-600x303.png 600w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/Grd-Blvd-NO2-moyenne-jours-et-heures-ouvr\u00e9s-370x187.png 370w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/Grd-Blvd-NO2-moyenne-jours-et-heures-ouvr\u00e9s-1040x525.png 1040w\" sizes=\"auto, (max-width: 799px) 100vw, 799px\" \/><\/p>\n<p>En ajoutant la moyenne avant et apr\u00e8s (pointill\u00e9 gris horizontal), on constate en effet une augmentation de 6\u00a0\u00b5g\/m3. Mais peut on conclure \u00e0 une augmentation li\u00e9 au nouveau plan de circulation ? Et si on faisait aussi cette analyse avec plus de semaines dans le pass\u00e9&#8230; Pourquoi pas l&rsquo;ensemble du d\u00e9but de l&rsquo;ann\u00e9e ? Voici le graphique r\u00e9sultat.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-225\" src=\"http:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/Grd-Blvd-NO2-moyenne-jours-et-heures-ouvr\u00e9s-2017.png\" alt=\"Grd Blvd NO2 moyenne jours et heures ouvr\u00e9s - 2017\" width=\"800\" height=\"403\" srcset=\"https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/Grd-Blvd-NO2-moyenne-jours-et-heures-ouvr\u00e9s-2017.png 1146w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/Grd-Blvd-NO2-moyenne-jours-et-heures-ouvr\u00e9s-2017-300x151.png 300w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/Grd-Blvd-NO2-moyenne-jours-et-heures-ouvr\u00e9s-2017-768x387.png 768w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/Grd-Blvd-NO2-moyenne-jours-et-heures-ouvr\u00e9s-2017-1024x516.png 1024w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/Grd-Blvd-NO2-moyenne-jours-et-heures-ouvr\u00e9s-2017-600x303.png 600w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/Grd-Blvd-NO2-moyenne-jours-et-heures-ouvr\u00e9s-2017-370x187.png 370w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/Grd-Blvd-NO2-moyenne-jours-et-heures-ouvr\u00e9s-2017-1040x525.png 1040w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>On constate la difficult\u00e9 de conclure car la moyenne avant\/apr\u00e8s est maintenant quasi la m\u00eame\u00a0(-0,5 \u00b5g\/m3) !<\/p>\n<p>Et d&rsquo;ailleurs avec la m\u00e9thode \u00ab\u00a0Grenoble \u00e0 c\u0153ur\u00a0\u00bb, que se passe t-il sur la station Caserne de Bonne ? M\u00eame calcul et voici le r\u00e9sultat.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-227\" src=\"http:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/DeBonne-NO2-moyenne-jours-et-heures-ouvr\u00e9s.png\" alt=\"DeBonne NO2 moyenne jours et heures ouvr\u00e9s\" width=\"799\" height=\"403\" srcset=\"https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/DeBonne-NO2-moyenne-jours-et-heures-ouvr\u00e9s.png 1146w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/DeBonne-NO2-moyenne-jours-et-heures-ouvr\u00e9s-300x151.png 300w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/DeBonne-NO2-moyenne-jours-et-heures-ouvr\u00e9s-768x387.png 768w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/DeBonne-NO2-moyenne-jours-et-heures-ouvr\u00e9s-1024x516.png 1024w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/DeBonne-NO2-moyenne-jours-et-heures-ouvr\u00e9s-600x303.png 600w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/DeBonne-NO2-moyenne-jours-et-heures-ouvr\u00e9s-370x187.png 370w, https:\/\/vieagrenoble.fr\/wp-content\/uploads\/2017\/07\/DeBonne-NO2-moyenne-jours-et-heures-ouvr\u00e9s-1040x525.png 1040w\" sizes=\"auto, (max-width: 799px) 100vw, 799px\" \/><\/p>\n<p>Moyenne \u00e9gale au dixi\u00e8me pr\u00eat ! Au regard de ces \u00e9l\u00e9ments de r\u00e9flexion, impossible de valider l&rsquo;argument \u00ab\u00a0Grenoble \u00e0 c\u0153ur\u00a0\u00bb et l&rsquo;utilisation d&rsquo;une pseudo m\u00e9thode scientifique est encore utilis\u00e9e pour justifier une cause. Une technique de cr\u00e9ation d&rsquo;une #fakenews malheureusement.<\/p>\n<p>Si vous lisez encore ce billet, d\u00e9j\u00e0 bravo, et ensuite vous avez bien compris que la m\u00e9thodologie de mesure et de comparaison et clef dans l&rsquo;interpr\u00e9tation des r\u00e9sultats. Aucun doute que les points de concentration de pollution se sont d\u00e9plac\u00e9s avec la circulation, mais \u00e0 ce stade, pas encore de conclusion possible scientifiquement sur la globalit\u00e9.<\/p>\n<p>Les param\u00e8tres influen\u00e7ant la pollution de l&rsquo;air sont nombreux, mais\u00a0une chose est certaine, si on limite les sources \u00e9mettrices de polluants, on limite le niveau de pollution. Juste un dernier chiffre, et pour terminer sur une note positive, encore plus de la moiti\u00e9 des d\u00e9placements \u00e0 Grenoble de moins d&rsquo;1 kilom\u00e8tre se font \u00e0 voiture ! Le potentiel d&rsquo;am\u00e9lioration est donc immense pour le b\u00e9n\u00e9fice de tous, incluant les automobilistes oblig\u00e9s d&rsquo;utiliser un v\u00e9hicule pour raison professionnelle ou personnelle.<\/p>\n<p>&nbsp;<\/p>\n<p><em>* source aussi de l&rsquo;<a href=\"http:\/\/vieagrenoble.fr\/index.php\/2017\/07\/11\/observatoire-qualite-de-lair-juin-2017\/\">&lsquo;observatoire de la qualit\u00e9 de l&rsquo;air<\/a><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Apr\u00e8s avoir d\u00e9cortiqu\u00e9 la naissance et cr\u00e9ation d&rsquo;une\u00a0#fakenews, on recommence avec ce graphique publi\u00e9 par l&rsquo;association \u00ab\u00a0Grenoble \u00e0 c\u0153ur\u00a0\u00bb, des opposants au projet m\u00e9tropolitain CVCM tel que pr\u00e9vu aujourd&rsquo;hui. Ils utilisent aussi les donn\u00e9es de[&#8230;]<\/p>\n","protected":false},"author":2,"featured_media":221,"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-220","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 #2 - L&#039;approche scientifique pour cr\u00e9dibiliser ! - 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\/07\/20\/fakenews-2-lapproche-scientifique-credibiliser\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"#Fakenews #2 - L&#039;approche scientifique pour cr\u00e9dibiliser ! - Vie \u00e0 Grenoble\" \/>\n<meta property=\"og:description\" content=\"Apr\u00e8s avoir d\u00e9cortiqu\u00e9 la naissance et cr\u00e9ation d&rsquo;une\u00a0#fakenews, on recommence avec ce graphique publi\u00e9 par l&rsquo;association \u00ab\u00a0Grenoble \u00e0 c\u0153ur\u00a0\u00bb, des opposants au projet m\u00e9tropolitain CVCM tel que pr\u00e9vu aujourd&rsquo;hui. 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