<?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>0016-7169</journal-id>
<journal-title><![CDATA[Geofísica internacional]]></journal-title>
<abbrev-journal-title><![CDATA[Geofís. Intl]]></abbrev-journal-title>
<issn>0016-7169</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geofísica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0016-71692024000401225</article-id>
<article-id pub-id-type="doi">10.22201/igeof.2954436xe.2024.63.4.1745</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Characterization of PM2.5 during the ACU15 campaign in Mexico City]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castro]]></surname>
<given-names><![CDATA[Telma]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Peralta]]></surname>
<given-names><![CDATA[Oscar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Prieto]]></surname>
<given-names><![CDATA[Cristina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santiago]]></surname>
<given-names><![CDATA[Naxieli]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alvarez-Ospina]]></surname>
<given-names><![CDATA[Harry]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[Rocío]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Saavedra]]></surname>
<given-names><![CDATA[Isabel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Espinosa]]></surname>
<given-names><![CDATA[María de la Luz]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández]]></surname>
<given-names><![CDATA[Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Miranda]]></surname>
<given-names><![CDATA[Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez]]></surname>
<given-names><![CDATA[Violeta]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Solís]]></surname>
<given-names><![CDATA[Corina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Salcedo]]></surname>
<given-names><![CDATA[Dara]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres-Jardón]]></surname>
<given-names><![CDATA[Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Arroyo]]></surname>
<given-names><![CDATA[Amparo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortínez-Alvarez]]></surname>
<given-names><![CDATA[Abraham]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruíz-Suárez]]></surname>
<given-names><![CDATA[Gerardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz]]></surname>
<given-names><![CDATA[Elba]]></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[Coyoacán CDMX]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias ]]></institution>
<addr-line><![CDATA[Coyoacán CDMX]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México  ]]></institution>
<addr-line><![CDATA[Coyoacán CDMX]]></addr-line>
<country>México</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Física ]]></institution>
<addr-line><![CDATA[Coyoacán CDMX]]></addr-line>
<country>México</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias ]]></institution>
<addr-line><![CDATA[ Querétaro]]></addr-line>
<country>México</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Universidad Autónoma Metropolitana  ]]></institution>
<addr-line><![CDATA[Azcapotzalco CDMX]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2024</year>
</pub-date>
<volume>63</volume>
<numero>4</numero>
<fpage>1225</fpage>
<lpage>1238</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-71692024000401225&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-71692024000401225&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-71692024000401225&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract We collected daily PM2.5 samples from January 19 to March 20, 2015, in the south of Mexico City and performed chemical analysis. The analyses showed an overall composition of 39% organic carbon, 12% elemental carbon, 20% water-soluble ions (NO3 -, SO4 -2, Cl-, Na+, K+, NH4 +, and Ca2+), and 23% elements (Al, Si, S, P, Cl, Cr, Mn, Fe, Pb, and Hg) in mass. Sulfur and phosphorus showed a correlation coefficient 0.91, likely indicating fossil fuel emissions. The samples contain secondary inorganic aerosols typical of urban areas, and the oxidation ratios of sulfur and nitrogen suggest that oxidative reactions from vehicle emissions probably produce them. Furthermore, modern carbon in PM2.5 represents half of the total carbon, indicating carbon sources other than fossils.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Recolectamos muestras diarias de PM2.5 del 19 de enero al 20 de marzo de 2015 en el sur de la Ciudad de México y realizamos análisis químicos. Los resultados de los análisis mostraron una composición general de 39% de carbono orgánico, 12% de carbono elemental, 20% de iones solubles en agua (NO3 -, SO4 -2, Cl-, Na+, K+, NH4 +, and Ca2+) y 23% de elementos (Al, Si, S, P, Cl, Cr, Mn, Fe, Pb y Hg) en masa. El azufre y el fósforo mostraron un coeficiente de correlación de 0.91, lo que probablemente indica emisiones de combustibles fósiles. Las muestras contienen aerosoles inorgánicos secundarios típicos de las zonas urbanas y los cocientes de oxidación del azufre y el nitrógeno sugieren que probablemente las reacciones oxidativas de las emisiones de los vehículos los produzcan. Además, el carbono moderno en PM2.5 representa la mitad del carbono total, lo que indica fuentes de carbono distintas de los fósiles.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Mexico City Metropolitan Area]]></kwd>
<kwd lng="en"><![CDATA[PM2.5]]></kwd>
<kwd lng="en"><![CDATA[radiocarbon]]></kwd>
<kwd lng="en"><![CDATA[secondary inorganic aerosols]]></kwd>
<kwd lng="es"><![CDATA[Área Metropolitana de la Ciudad de México]]></kwd>
<kwd lng="es"><![CDATA[PM2.5]]></kwd>
<kwd lng="es"><![CDATA[radiocarbono]]></kwd>
<kwd lng="es"><![CDATA[aerosol inorgánico secundario]]></kwd>
</kwd-group>
</article-meta>
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