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Title: A nationwide monitoring of atmospheric microplastic deposition
Authors: Edo, Carlos
Fernández-Piñas, Francisca
Leganes, Francisco
Gómez Cabrera, María Milagrosa 
Martinez Sanchez,Ico 
Herrera Ulibarri, Alicia 
Hernández-Sánchez, Cintia
González-Sálamo, Javier
Borges, Javier Hernández
López-Castellanos, Joaquín
Bayo, Javier
Romera-Castillo, Cristina
Elustondo, David
Santamaría, Carolina
Alonso, Rocío
García-Gómez, Héctor
Gonzalez-Cascon, Rosario
Martínez-Hernández, Virtudes
Landaburu-Aguirre, Junkal
Incera, Mónica
Gago, Jesús
Noya, Beatriz
Beiras, Ricardo
Muniategui-Lorenzo, Soledad
Rosal, Roberto
González-Pleiter, Miguel
UNESCO Clasification: 330801 Control de la contaminación atmosférica
331210 Plásticos
Keywords: Atmosphere
Atmospheric deposition
Airborne microplastics
Sampling methodology
Outdoor fallout, et al
Issue Date: 2023
Journal: Science of the Total Environment 
Abstract: Plastic production continues to increase every year, yet it is widely acknowledged that a significant portion of this material ends up in ecosystems as microplastics (MPs). Among all the environmental compartments affected by MPs, the atmosphere remains the least well-known. Here, we conducted a one-year simultaneous monitoring of atmospheric MPs deposition in ten urban areas, each with different population sizes, economic activities, and climates. The objective was to assess the role of the atmosphere in the fate of MPs by conducting a nationwide quantification of atmospheric MP deposition. To achieve this, we deployed collectors in ten different urban areas across continental Spain and the Canary Islands. We implemented a systematic sampling methodology with rigorous quality control/quality assurance, along with particle-oriented identification and quantification of anthropogenic particle deposition, which included MPs and industrially processed natural fibres. Among the sampled MPs, polyester fibres were the most abundant, followed by acrylic polymers, polypropylene, and alkyd resins. Their equivalent sizes ranged from 22 μm to 398 μm, with a median value of 71 μm. The particle size distribution of MPs showed fewer large particles than expected from a three-dimensional fractal fragmentation pattern, which was attributed to the higher mobility of small particles, especially fibres. The atmospheric deposition rate of MPs ranged from 5.6 to 78.6 MPs m−2 day−1, with the higher values observed in densely populated areas such as Barcelona and Madrid. Additionally, we detected natural polymers, mostly cellulosic fibres with evidence of industrial processing, with a deposition rate ranging from 6.4 to 58.6 particles m−2 day−1. There was a positive correlation was found between the population of the study area and the median of atmospheric MP deposition, supporting the hypothesis that urban areas act as sources of atmospheric MPs. Our study presents a systematic methodology for monitoring atmospheric MP deposition.
ISSN: 0048-9697
DOI: 10.1016/j.scitotenv.2023.166923
Source: Science of the Total Environment [ISSN 0048-9697], v. 905, (Diciembre 2023)
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