<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0187-6236</journal-id>
<journal-title><![CDATA[Atmósfera]]></journal-title>
<abbrev-journal-title><![CDATA[Atmósfera]]></abbrev-journal-title>
<issn>0187-6236</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Ciencias de la Atmósfera y Cambio Climático]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-62362022000300521</article-id>
<article-id pub-id-type="doi">10.20937/atm.52993</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Application of network theory to study the spatio-temporal evolution in the ozone weekend effect in urban areas]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Paniagua]]></surname>
<given-names><![CDATA[Iván Y.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lopez-Farias]]></surname>
<given-names><![CDATA[Rodrigo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pichardo-Corpus]]></surname>
<given-names><![CDATA[Juan Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Ciencias de la Atmósfera y Cambio Climático ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Centro de Investigación en Ciencias de Información Geoespacial A.C.  ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Consejo Nacional de Ciencia y Tecnología  ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,El Colegio de la Frontera Norte Departamento de Estudios Urbanos y del Medio Ambiente ]]></institution>
<addr-line><![CDATA[Tijuana Baja California]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<volume>35</volume>
<numero>3</numero>
<fpage>521</fpage>
<lpage>543</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-62362022000300521&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-62362022000300521&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-62362022000300521&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The occurrence of higher ground-level O3 concentrations on weekends rather than on weekdays, despite reduced anthropogenic activity in urban areas, is known as the O3 weekend effect (OWE). We present here an approach to analyse OWE spatio-temporal variations in urban areas, integrated by the trend, prediction and network representation. We used data from ten monitoring sites geographically distributed within the Mexico City Metropolitan Area (MCMA) recorded during 1994-2018. The OWE occurrence within the MCMA ranged typically between 40 and 60 % of the total weeks per year. The annual differences between weekday and weekend O3 peaks (magnitudes) showed were most significant on Sundays. Naive, Linear and Auto-regressive Integrated Moving Average models were tested for predicting the OWE annual occurrences and magnitudes. There was no single model that outperformed significantly for predicting OWE at all sites. The proposed concept of generalised OWE (GOWE) implies that at least half of the sites under study exhibited simultaneous OWE occurrence. GOWE is represented as a network and its integration with prediction models is useful to determine the OWE spread over the MCMA in the following years. The GOWE occurrence showed an increasing trend interpreted as the spread of VOC-limited conditions over most of the MCMA. Predicted data suggest that, with the current emission control policies, the GOWE will continue occurring. The integrated methodology presented provides valuable insight into the design of potential air quality control strategies.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La ocurrencia de altas concentraciones de ozono (O3) a nivel de superficie durante los fines de semana en días hábiles, a pesar de la reducción de la actividad antropogénica en las áreas urbanas, se conoce como el efecto de fin de semana de O3 (OWE). Presentamos aquí un enfoque para analizar las variaciones espacio-temporales del OWE en áreas urbanas, integrado por análisis de tendencia, predicción y de redes. Utilizamos datos de diez sitios de monitoreo distribuidos geográficamente dentro del Área Metropolitana de la Ciudad de México (MCMA) durante 1994-2018. La ocurrencia el OWE dentro de la MCMA osciló típicamente entre el 40 y el 60 % del total de semanas por año. Las diferencias anuales entre los picos (magnitudes) de O3 entre semana y fin de semana fueron más significativas los domingos. Se probaron modelos de promedio móvil integrado Naive, lineal y autorregresivo para predecir las ocurrencias y magnitudes anuales del OWE. Ningun modelo se destacó significativamente por su predicción del OWE en todos los sitios. El concepto propuesto de OWE generalizado (GOWE) implica que al menos la mitad de los sitios bajo estudio exhibieron ocurrencia simultánea de OWE. El GOWE se representa como una red y su integración con modelos de predicción es útil para determinar el OWE en la MCMA en años siguientes. La ocurrencia de GOWE mostró una tendencia creciente interpretada como la propagación de condiciones de producción de O3 limitadas por compuestos orgánicos volátiles (VOC) en la mayor parte de la MCMA. Los datos pronosticados sugieren que el GOWE seguirá ocurriendo, bajo las políticas actuales de control de emisiones. La metodología integrada presentada proporciona información valiosa sobre el diseño de posibles estrategias de control de la calidad del aire.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Air quality]]></kwd>
<kwd lng="en"><![CDATA[networks]]></kwd>
<kwd lng="en"><![CDATA[generalised ozone weekend effect]]></kwd>
<kwd lng="en"><![CDATA[prediction]]></kwd>
</kwd-group>
</article-meta>
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