Causes of increased pollen exposure during Saharan-Sahel dust intrusions



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Rojo Ubeda, Jesús and Moreno, José María and Romero-Morte, Jorge and Lara, Beatriz and Elvira-Rendueles, Belén and Negral, Luis and Fernández González, Federico and Pérez Badia, Rosa and Moreno-Grau, Stella (2021) Causes of increased pollen exposure during Saharan-Sahel dust intrusions. Environmental Pollution, 284 . p. 117441. ISSN 0269-7491

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Airborne particulate matter such as mineral dust comes mainly from natural sources, and the African regions of Sahara and Sahel originate large amounts of the aerosols dispersed worldwide. There is little knowledge about the influence of dust episodes on airborne pollen concentrations, and although the centre and southeast of the Iberian Peninsula are frequently affected by dust intrusions, until now, no specific works have analysed the effect of these episodes on airborne pollen concentrations in these areas. The aims of this study were to analyse the simultaneous occurrence of airborne pollen peaks and Saharan-Sahel dust intrusions in the central and south-eastern Iberian Peninsula, and to study the weather conditions – air mass pathways and conditions of air temperature, relative humidity and atmospheric pressure – that influence the airborne pollen concentrations during dust episodes. The results showed that the rise in airborne pollen concentrations during dust episodes is apparent in inland Iberian areas, although not in coastal areas in the southeast where pollen concentrations are even observed to decrease, coinciding with prevailing easterly winds from the sea. Total pollen concentrations and specific pollen types such as Olea, Poaceae and Quercus showed an increase in the central Iberian Peninsula during dust episodes when two meteorological phenomena concur: 1) prevailing winds from extensive areas of major wind-pollinated pollen sources over a medium or short distance (mainly from western and southwestern areas); and 2) optimal meteorological conditions that favour pollen release and dispersal into the atmosphere (mainly high temperatures and subsequently low humidity in central areas). Both conditions often occur during the Saharan-Sahel dust intrusions in the centre. Maximum pollen peaks are therefore most likely to occur during dust episodes in the central Iberian Peninsula, thus dramatically increasing the risk of outbreaks of pollinosis and other respiratory diseases in the population.

Item Type:Article
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CRUE-CSIC (Acuerdos Transformativos 2021)

Uncontrolled Keywords:Dust outbreaks; Pollen exposure; Environmental conditions; Wind patterns
Subjects:Medical sciences > Pharmacy > Botany
Medical sciences > Pharmacy > Pharmacology
ID Code:70424
Deposited On:14 Feb 2022 13:01
Last Modified:18 Oct 2022 09:06

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