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                        <gmd:URL>undefined</gmd:URL>
                     </gmd:linkage>
                     <gmd:protocol>
                        <gco:CharacterString>undefined</gco:CharacterString>
                     </gmd:protocol>
                     <gmd:name>
                        <gco:CharacterString>undefined</gco:CharacterString>
                     </gmd:name>
                     <gmd:description>
                        <gco:CharacterString>undefined</gco:CharacterString>
                     </gmd:description>
                  </gmd:CI_OnlineResource>
               </gmd:onLine>
            </gmd:MD_DigitalTransferOptions>
         </gmd:transferOptions>
      </gmd:MD_Distribution>
  </gmd:distributionInfo>
  <gmd:dataQualityInfo>
      <gmd:DQ_DataQuality>
         <gmd:scope>
            <gmd:DQ_Scope>
               <gmd:level>
                  <gmd:MD_ScopeCode codeListValue="dataset"
                                    codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#MD_ScopeCode"/>
               </gmd:level>
            </gmd:DQ_Scope>
         </gmd:scope>
         <gmd:report>
            <gmd:DQ_DomainConsistency>
               <gmd:result xmlns:srv="http://www.isotc211.org/2005/srv"
                           xmlns:xlink="http://www.w3.org/1999/xlink"
                           xmlns:gmx="http://www.isotc211.org/2005/gmx">
                  <gmd:DQ_ConformanceResult>
                     <gmd:specification>
                        <gmd:CI_Citation>
                           <gmd:title>
                              <gco:CharacterString>Guide INSPIRE sur les conditions atmosphériques</gco:CharacterString>
                           </gmd:title>
                           <gmd:date>
                              <gmd:CI_Date>
                                 <gmd:date>
                                    <gco:Date>2013-12-10</gco:Date>
                                 </gmd:date>
                                 <gmd:dateType>
                                    <gmd:CI_DateTypeCode codeList="http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#CI_DateTypeCode"
                                                         codeListValue="publication"/>
                                 </gmd:dateType>
                              </gmd:CI_Date>
                           </gmd:date>
                        </gmd:CI_Citation>
                     </gmd:specification>
                     <gmd:explanation>
                        <gco:CharacterString>Ce document décrit la « spécification de données INSPIRE sur les conditions atmosphériques et les caractéristiques géographiques de météorologie - Directives techniques » version 3.0 développée par le groupe de travail thématique (GTT) AC-MF en utilisant un langage de schéma naturel et conceptuel.</gco:CharacterString>
                     </gmd:explanation>
                     <gmd:pass>
                        <gco:Boolean>true</gco:Boolean>
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               </gmd:result>
            </gmd:DQ_DomainConsistency>
         </gmd:report>
         <gmd:lineage>
            <gmd:LI_Lineage>
               <gmd:statement>
                  <gco:CharacterString>Les cartes des indicateurs annuels de pollution sur la région des Pays de la Loire sont produites chaque année dans le cadre du reporting européen.
L'estimation des concentrations est réalisée conformément aux recommandations du Laboratoire Central de Surveillance de la Qualité de l’Air (LCSQA), dans le respect des exigences réglementaires en vigueur. 

Pour produire cette information, Air Pays de la Loire s'appuie sur la plateforme inter-regionale ESMERALDA de modélisation de la dispersion des polluants atmosphériques qui met en oeuvre un système de prévision quotidienne des concentrations de polluants basé sur un modèle de météorologie (MM5 V.7.3) exploitant les prévisions météorologiques GFS du NCEP et un modèle de dispersion (CHIMERE V2014b) à partir des données de l'inventaire régional BASEMIS® et des autres régions partenaires.

Les indicateurs annuels ont été calculés en 2021 sur les 7 polluants suivants : NO2, O3, PM10, PM2,5, CO, SO2 et C6H6. Le calcul des statistiques annuelles repose sur le couplage d'une information régionale à grande échelle fournie par le modèle haute résolution de la plateforme ESMERALDA avec une modélisation fine des principales sources de pollution régionales incluant le trafic automobile, les industries, les carrières et les chaufferies par le biais du logiciel ADMS-urban.

La couche d'information est produite à une maille de résolution de 3,5 km et est disponible pour une exploitation à une échelle variant du 1/1 150 000ème au 1/25 000ème pour une projection en Lambert 93.

Avertissement :
Les objectifs de qualité des données fixés par la Directive 2008/50/CE pour l’évaluation de la qualité de l’air ambiant sont respectés. Toutefois, les estimations des émissions et des modélisations sont des résultats de calculs qui par construction, sont altérées d’incertitudes liées à l’état des connaissances scientifiques dans le domaine de la physico-chimie de l’atmosphère et des méthodologies de calculs des émissions ainsi qu’à la qualité des données d’entrée. 
Dans ces conditions, Air Pays de la Loire ne saurait être tenu pour responsable des conséquences résultant de la qualité de ces données et des incertitudes qui y sont attachées.
Les méthodes et outils de calculs évoluant dans le temps, la comparaison entre plusieurs années de modélisations n'a donc pas de sens et Air Pays de la Loire ne peut en aucune façon être tenu responsable des interprétations, travaux intellectuels, publications diverses ou de toute œuvre utilisant ces cartographies pour lesquels Air Pays de la Loire n'aura pas donné d'accord préalable.</gco:CharacterString>
               </gmd:statement>
            </gmd:LI_Lineage>
         </gmd:lineage>
      </gmd:DQ_DataQuality>
  </gmd:dataQualityInfo>
</gmd:MD_Metadata>