<?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>S0187-62362023000300109</article-id>
<article-id pub-id-type="doi">10.20937/atm.53100</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Spatio-temporal co-variability of air pollutants and meteorological variables over Haqel and Jeddah, Saudi Arabia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tazeem]]></surname>
<given-names><![CDATA[Syeda Batool]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nabeel]]></surname>
<given-names><![CDATA[Ahmed]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Athar]]></surname>
<given-names><![CDATA[Hussain]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,COMSATS University Islamabad Department of Meteorology ]]></institution>
<addr-line><![CDATA[Islamabad ]]></addr-line>
<country>Pakistan</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,ISRA University School of Engineering &amp; Applied Sciences ]]></institution>
<addr-line><![CDATA[Islamabad ]]></addr-line>
<country>Pakistan</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,COMSATS University Islamabad Centre for Climate Research and Development ]]></institution>
<addr-line><![CDATA[Islamabad ]]></addr-line>
<country>Pakistan</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<volume>37</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-62362023000300109&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-62362023000300109&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-62362023000300109&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT This study presents a first simultaneous trend and magnitude assessment of air pollutants (CO, H2S, SO2, NO2, NO, NOX, O3 and PM10) and meteorological variables (rainfall [RF], relative humidity [RH], atmospheric pressure [PR], temperature [TC], wind speed [WS], and wind direction [WD]) in the city of Haqel and at four different locations in the city of Jeddah, Saudi Arabia, for a continuous 5-year period (2008-2012). The spatio-temporal co-variations of air pollutants in terms of their diurnal, weekly, seasonal and annual cycles, and their relationship with meteorological conditions, along with the estimates of the weekend effect, are described. A decreasing annual trend was observed for most air pollutants analyzed except for O3 and PM10. The CO, NO2, NO and NOX displayed a strong weekend effect. A percentile-based change analysis displayed an increase in concentrations for O3 (PM10) in the lower (higher) percentiles from the first to second half of the study period. The study identified 12 cyclonic weather events during the 5-year time period associated with high PM10 concentrations (&gt; 500 µg m-3) relative to a mean value of 102 µg m-3, with a standard deviation value of 179 µg m-3. The study also analyzed the impacts of several mid-latitude anti-cyclonic events on air pollutant concentrations and found a significant change in air pollutant concentrations (CO, SO2, NO2, NO, NOX, O3 and PM10) and meteorological variables (RH, PR, TC, WS, and WD) associated with stagnant upper air conditions during the atmospheric blocking.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Este estudio presenta una primera evaluación simultánea de la tendencia y la magnitud de los contaminantes atmosféricos (CO, H2S, SO2, NO2, NO, NOX, O3 y PM10) y las variables meteorológicas (precipitación [RF], humedad relativa [RH], presión atmosférica [PR], temperatura [TC], velocidad del viento [WS] y dirección del viento [WD]) en la ciudad de Haqel y en cuatro lugares diferentes de la ciudad de Jeddah, Arabia Saudí, durante un periodo continuo de cinco años (2008-2012). Se describen las covariaciones espacio-temporales de los contaminantes atmosféricos en cuanto a sus ciclos diurnos, semanales, estacionales y anuales, y su relación con las condiciones meteorológicas, junto con las estimaciones del efecto de fin de semana. Se observó una tendencia anual decreciente para la mayoría de los contaminantes atmosféricos analizados, excepto para el O3 y las PM10. El CO, NO2, NO y NOX mostraron un fuerte efecto de fin de semana. Un análisis de cambio basado en percentiles mostró un aumento de las concentraciones de O3 (PM10) en los percentiles inferiores (superiores) de la primera a la segunda mitad del periodo de estudio. El estudio identificó 12 fenómenos meteorológicos ciclónicos durante el periodo de cinco años asociados a altas concentraciones de PM10 (&gt; 500 µg m-3) en relación con un valor medio de 102 µg m-3, con una desviación estándar de 179 µg m-3. El estudio también analizó los impactos de varios eventos anticiclónicos de latitudes medias en las concentraciones de contaminantes atmosféricos y encontró un cambio significativo en las concentraciones de contaminantes atmosféricos (CO, SO2, NO2, NO, NOX, O3 y PM10) y en las variables meteorológicas (HR, PR, TC, WS y WD) asociadas con las condiciones de aire superior estancado durante el bloqueo atmosférico.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[air pollutant characterization]]></kwd>
<kwd lng="en"><![CDATA[weekend effect]]></kwd>
<kwd lng="en"><![CDATA[extreme events]]></kwd>
<kwd lng="en"><![CDATA[blocking impacts]]></kwd>
<kwd lng="en"><![CDATA[Saudi Arabia]]></kwd>
</kwd-group>
</article-meta>
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