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dc.contributorGómez Valentín, Manuel
dc.contributorSalazar González, Fernando
dc.contributor.authorLópez Chacón, Sergio Ricardo
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental
dc.coverage.spatialeast=2.11561918258667; north=41.384794359773224; name=Avinguda Diagonal, 647, 08028 Barcelona, Espanya
dc.date.accessioned2022-01-26T19:44:42Z
dc.date.available2022-01-26T19:44:42Z
dc.date.issued2021-09-09
dc.identifier.urihttp://hdl.handle.net/2117/360812
dc.description.abstractIn the last decades, the interest in predicting tropospheric ozone levels (O₃) has increased due to its detrimental effect on population health and vegetation. Although certain factors such as solar radiation are well known to have an influence on ozone levels, the effect of other variables is less clear. In this study, several regression models based on the Random Forest (RF) algorithm are generated to predict the daily maximum hourly ozone concentration level (1hO₃) and the daily maximum 8-hours average ozone concentration level (8hO₃) one day ahead in Barcelona, using air quality data, meteorological data and time variables as inputs. Two versions of the model are considered: taking information from the whole year and focusing only on summer months (May to September). In addition, classification models are created, based on thresholds inspired by current regulations for both outputs. RF regression models capture the time variation of tropospheric ozone through the year and they generate accurate estimations with acceptable deviation between the observations and predictions. In general, the categorical models of 1hO₃ show suitable and lower error rates than 8hO₃. However, the categories, which gather the most of the tropospheric ozone values have high accuracy and the categories with few values inside them have low accuracy. Consequently, these categorical models are not useful as a tool to alert the population about a specific ozone event. The analysis of RF models shows that the tropospheric ozone level (1hO₃ or 8hO₃ according to the model) of the previous day to the prediction has the strongest association to the output. The importance of other inputs varies between the models considered; while solar radiation and day of the year are the main variables after O₃ for the whole year models, relative humidity, average dew-point deficit and weekday are also relevant in the summer models.
dc.language.isoeng
dc.publisherUniversitat Politècnica de Catalunya
dc.subjectÀrees temàtiques de la UPC::Informàtica::Intel·ligència artificial::Aprenentatge automàtic
dc.subjectÀrees temàtiques de la UPC::Enginyeria civil::Impacte ambiental
dc.subject.lcshOzone
dc.subject.lcshMachine learning
dc.subject.otherMachine Learning
dc.subject.otherozone
dc.titlePrediction of tropospheric ozone concentration at urban locations using machine learning algorithms. Application to Barcelona, Spain
dc.typeMaster thesis
dc.subject.lemacOzó
dc.subject.lemacAprenentatge automàtic
dc.identifier.slugPRISMA-163134
dc.rights.accessOpen Access
dc.date.updated2021-10-13T18:31:08Z
dc.audience.educationlevelMàster
dc.audience.mediatorEscola Tècnica Superior d'Enginyers de Camins, Canals i Ports de Barcelona
dc.audience.degreeMÀSTER UNIVERSITARI ERASMUS MUNDUS EN HIDROINFORMÀTICA I GESTIÓ DE L'AIGUA (Pla 2009)
dc.contributor.covenanteeCentre Internacional de Mètodes Numèrics a l'Enginyeria


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