Characterization of PM2.5 during ACU15 campaign in Mexico City
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Resumen
La Ciudad de México emite varios miles de toneladas de partículas provenientes del transporte y otros sectores económicos. Recolectamos muestras de PM2.5 de enero a marzo de 2015 y los análisis químicos mostraron que el PM2.5 se compone por 39% de carbono orgánico, 12% de carbono elemental, 23% de metales (Al, Si, S, P y K) y 5% metales pesados (Pb, Cr, Mn, Zn y Hg). Ca y Fe también estuvieron presentes en concentraciones traza, probablemente debido a la resuspensión de suelos. Los nitratos, sulfatos y amonio sugieren que el suroeste de la Ciudad de México, específicamente el sitio de muestreo, recibe más contaminantes oxidados por emisiones de vehículos que otros tipos de emisiones. Los análisis químicos no muestran cambios significativos en la composición o concentración de partículas en comparación con estudios anteriores.
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