Comparative Study of Atmospheric Particulate Matter Size Distribution in East and West Tehran, Iran

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Balal Oroji

Resumen

Para investigar el patrón de distribución del tamaño de las partículas atmosféricas suspendidas en Teherán, se realizó un muestreo simultáneo en seis estaciones ubicadas en las mitades occidental (ST1 a ST3) y oriental (ST4 a ST6) de la ciudad. Se midieron las concentraciones de masa en nueve fracciones de tamaño que iban desde partículas mayores de 11 µm hasta aquellas menores de 0.4 µm. Los resultados indicaron que en las estaciones occidentales, las concentraciones de masa más altas se observaron principalmente en las fracciones de partículas más gruesas (11-7 µm y ≥11 µm), con valores máximos de 19.6 y 16.3 µg.m-3 registrados en ST2 y ST1, respectivamente. Este patrón sugiere el predominio de fuentes mecánicas y la resuspensión de polvo de la carretera en la parte occidental de la ciudad. En contraste, la mitad oriental de Teherán exhibió una tendencia creciente en la concentración dentro de las fracciones más finas (menos de 2.1 µm), con el valor más alto medido en ST6 en la fracción <0.4 µm (18.7 µg.m-3). Además, en los rangos de 0.7-0.4 µm y 2.1-1.1 µm, las estaciones orientales mostraron concentraciones más altas en comparación con las estaciones occidentales. Este cambio en el patrón de distribución de tamaño, del predominio de partículas gruesas en el oeste al predominio de partículas finas en el este, puede atribuirse a las diferencias en el uso del suelo, la densidad del tráfico, las fuentes relacionadas con la combustión, así como las condiciones topográficas y los patrones de viento predominantes en Teherán. En general, los hallazgos indican una mayor contribución de partículas finas secundarias y relacionadas con la combustión en la mitad oriental, mientras que la mitad occidental parece estar más influenciada por fuentes primarias y la resuspensión de partículas gruesas. Estos resultados resaltan la importancia de las estrategias de gestión específicas de la región para el control efectivo de la contaminación por material particulado en la megaciudad de Teherán.

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Cómo citar
Oroji, B. (2026). Comparative Study of Atmospheric Particulate Matter Size Distribution in East and West Tehran, Iran. Geofísica Internacional, 65(3), 2325–2337. https://doi.org/10.22201/igeof.2954436xe.2026.65.3.1932
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