Influence of precipitation scavenging on the PM2.5/PM10 ratio at the Kennedy locality of Bogota, Colombia

Authors

DOI:

https://doi.org/10.17533/udea.redin.n76a07

Keywords:

Precipitation, PM2.5/PM10 ratio, air pollution, scavenging

Abstract


Objective: To establish whether the scavenging effect reduces the PM2.5/PM10 ratio in rainy periods in comparison with dry periods, at the Kennedy locality of Bogotá, Colombia. Materials and methods: Relationships among hourly and daily PM10, PM2.5, PM2.5/ PM10 ratio, temperature, relative humidity and precipitation records from the Kennedy air quality station from January 2007 to September 2011 were analyzed. Results: The hourly mean PM2.5/PM10 ratio was 0.36 (SD= ± 0.12), with an hourly maximum of 0.96. In rainy hours, the PM2.5/PM10 ratio was 0.41 (SD= ± 0.13) and was reduced to 0.36 (DE= ± 0.12) in dry hours. On the other hand, the daily mean PM2.5/PM10 ratio was 0.36 (SD= ± 0.09) with a daily maximum of 0.79. The daily mean on rainy days was higher (0.39; SD= ± 0.09) than that recorded on dry days (0.34; SD= ±0.08). All these differences were statistically signifi cant. Conclusions: Precipitation reduces PM2.5 concentrations at a lower extent than it reduces PM10 concentrations. The analysis was not conclusive about the effect of precipitation on PM2.5 concentrations, so it is not possible to assert that precipitation reduces the risk associated with the exposure to airborne particulate matter. To deepen our knowledge about the effect of precipitation on particulate matter pollution, it is recommended to apply additional techniques such as particle counting and particulate matter chemical characterization.

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Author Biographies

Luis Camilo Blanco-Becerra, Universidad Santo Tomas

Facultad de Ingeniería Ambiental

Aurora Inés Gáfaro-Rojas, Universidad Industrial de Santander

Departamento de Salud Pública, Facultad de Salud, Docente

Nestor Yezid Rojas-Roa, Universidad Nacional de Colombia

Departamento de Química e Ingeniería Ambiental, docente

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Published

2015-09-25

How to Cite

Blanco-Becerra, L. C., Gáfaro-Rojas, A. I., & Rojas-Roa, N. Y. (2015). Influence of precipitation scavenging on the PM2.5/PM10 ratio at the Kennedy locality of Bogota, Colombia. Revista Facultad De Ingeniería Universidad De Antioquia, (76), 58–65. https://doi.org/10.17533/udea.redin.n76a07

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