[Latinmag] Ciclo de charlas LatinMag

[Romina Achaga]

Estimada Comunidad LatinMag,

Esperando que todos estén muy bien, les escribimos para invitarlos a la
siguiente charla del ciclo de conferencias de LatinMag 2025. El próximo
viernes 20 de Junio (Bogotá: 9:00, Ciudad de México: 8:00, São Paulo/Buenos
Aires: 11:00). En esta oportunidad tendremos a Nicolas Hispagnol (National
Observatory, Rio de Janeiro), con la charla titulada “Tracing Urban Air
Pollution Through Magnetic Characterization of PM2.5 in São Paulo”. Al
final de este mensaje pueden encontrar el link de Google Meet para la
charla y su resumen.

Esperamos verlos pronto,

Victor Piedrahita y Romina Achaga
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Prezada Comunidade LatinMag,

Esperando que todos estejam muito bem, escrevemos para convidá-los para a
próxima palestra do ciclo de conferências LatinMag 2025. Será na próxima
sexta-feira, 20 de Junho (Bogotá: 9:00, Cidade do México: 8:00, São
Paulo/Buenos Aires: 11:00). Nesta ocasião, teremos a Nicolas Hispagnol
(National Observatory, Rio de Janeiro), com a palestra intitulada “Mineral
fabrics and emplacement of Permian and Jurassic arc plutons from the
southern Colombian Andes”. Ao final desta mensagem, vocês encontram o link
do GoogleMeet para a palestra e o resumo.


Esperamos vê-los em breve,

Victor Piedrahita e Romina Achaga
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Link:

https://meet.google.com/drz-tieo-edo


Tracing Urban Air Pollution Through Magnetic Characterization of PM2.5 in
São Paulo

Urbanization and industrialization have intensified the emission of
pollutants, including iron-bearing particulate matter (IPM), which is
associated with vehicle exhaust, industrial activities, and road dust
resuspension. These particles pose health risks by penetrating the
respiratory and circulatory systems. Although São Paulo is a megacity with
high levels of air pollution, the presence and behavior of metallic
particles in the city remain poorly understood. To address this gap, PM2.5
samples were collected from high-traffic areas between 2022 and 2023. The
samples were analyzed using magnetic characterization techniques—magnetic
susceptibility, hysteresis, and isothermal remanent magnetization—and the
results were correlated with meteorological data. Inversion modeling, using
the Superparamagnetic Concentration and Dipole Moment method, was also
applied to estimate the size and concentration of superparamagnetic
particles and their relationship with atmospheric pollutants. The results
revealed a predominance of magnetite/maghemite and indicated a reduction in
ferromagnetic particle concentrations during the rainy season. Magnetic
parameters showed strong correlations with PM2.5, NO2, and CO, highlighting
environmental magnetism as a promising tool for monitoring urban air
quality.






Romina Achaga
Postdoctoral researcher
Campus France / CONICET
IPGP / CIFICEN
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