Abstract
Pollen is one of the most remarkable components of bioaerosols, as it serves as the primary vector for most of airborne allergens affecting humans. It is anticipated that, due to the multifaceted impacts of global change, its relevance will continue to increase in the future. In the Madrid Region, the Madrid Region Palynological Network works as an environmental surveillance system for airborne pollen exposure, and has been established as a key preventive tool for public health since 1994 to the present.
This study examines the incidence of the main morphological pollen types during the year 2024, analysing annual and monthly pollen indices, as well as the seasonal trends of the most allergenic pollen types. The findings reveal that 2024 not only registered the highest overall pollen concentration in the historical series, but also that certain allergenic taxa, commonly used for ornamental purposes, were responsible for the majority of the pollen amounts during the study period.
Public engagement with the aerobiological data provided by the network was assessed through web visits to the official information platforms. A marked increase in visits was observed during periods of elevated concentrations of allergenic pollen in the air, highlighting both the practical utility of the information and the population’s demand for accurate, standardised, and up-to-date scientific data in the Madrid Region.
References
Maya-Manzano JM, Smith M, Markey E, Hourihane Clancy J, Sodeau J, O’Connor DJ. Recent developments in monitoring and modelling airborne pollen, a review. Grana. 2021; 60:1–19.
Rodríguez-Arias RM, Rojo J, Fernández-González F, Pérez-Badia R. Desert dust intrusions and their incidence on airborne biological content. Review and case study in the Iberian Peninsula. Environ. Pollut. 2023; 316:120464.
Biagioni B, Annesi-Maesano I, D’Amato G. Cecchi L. The rising of allergic respiratory diseases in a changing world: from climate change to migration. Expert Rev. Respir. Med. 2020; 14:973–86.
D’Amato G, Chong-Neto, HJ, Ortega OPM, Vitale C, Ansotegui I, Rosario N, Haahtela, et al. The effects of climate change on respiratory allergy and asthma induced by pollen and mold allergens. Allergy. 2020; 75:2219–28.
Zubeldia JM, Baeza M L, Chivato T, J´ auregui I, Senent CJ. 2021. El libro de las enfermedades alérgicas. Fundacion BBVA.
European Academy of Allergy and Clinical & Immunology. (2015). Advocacy manifestó ackling the allergy crisis in Europe Concerted policy action needed [citado el 24 de octubre de 2018] Disponible en: https://eaaci.org/wp-content/uploads/2024/02/EAACI_Advocacy_Manifesto.pdf.
Ojeda P, Sastre J, Olaguibel J, Chivato T. Alergólogica 2015: A National Survey on allergic diseases in the adult spanish population. J. Investig. Allergol. Clin. Inmunol. 2018; 28(3):151–64.
Strzelczyk Z, Roszkowski M, Feleszko W, Krauze A. Avoidance of allergens as an environmental method in the prevention of inhaled allergy symptoms. Allergol. Immunopathol. 2020; 48(6):745–52.
Buters JTM, Antunes C, Galveias A, Bergmann KC, Thibaudon M, et al. Pollen and spore monitoring in the world. Clin. Transl. Allergy 2018;8.
Grewling Ł, Ribeiro H, Antunes C, Apangu GP, Çelenk S, Costa A., Skjøth CA. Outdoor airborne allergens: characterization, behavior and monitoring in Europe. Sci. Total Environ. 2023; 905;167042.
Rojo J, Oteros J, Picornell A, Maya-Manzano JM, Damialis A, Zink K, et al. Effects of future climate change on birch abundance and their pollen load. Glob. Change Biol. 2021; 27:5934–49.
Ziska LH, Makra L, Harry SK, Bruffaerts N, Hendrickx M, Coates F, et al. Temperature-related changes in airborne allergenic pollen abundance and seasonality across thenorthern hemisphere: a retrospective data analysis. Lancet Planet. Health. 2019; 3:124–31.
Anderegg WR, Abatzoglou JT, Anderegg LD, Bielory L, Kinney PL, Ziska L. Anthropogenic climate change is worsening North American pollen seasons. Proc. Natl Acad. Sci. U. S. A. 2021; 118(7):e2013284118.
Shea KM, Truckner RT, Weber RW, Peden DB. Climate change and allergic disease. J. Allergy Clin. Immunol. 2008; 122:443–53.
Bajin MD, Cingi C, Oghan F, Gurbu M. Global warming and allergy in Asia Minor. Eur. Arch. Otorhinolaryngol. 2013; 270:27–31.
Singh AB, Kumar P. Climate change and allergic diseases: an overview. Front. Allergy. 2022; 3:1–9.
Choi YJ, Lee KS, Oh JW. The impact of climate change on pollen season and allergic sensitization to pollens. Immunol. Allergy Clin. North Am. 2021; 41:97–109.
D’Amato G, D’Amato M. Climate change, air pollution, pollen allergy and extreme atmospheric events. Curr. Opin. Pediatr. 2023; 35:356–61.
Song Y, Jiao W, Wang J, Wang L. Increased global vegetation productivity despite rising atmospheric dryness over the last two decades. Earths. Future. 2022; 10:1–16.
Wolfe DW, Erickson JD. Carbon Dioxide Effects on Plants: Uncertainties and Implications for Modeling Crop Response to Climate Change. In Agricultural Dimensions of Global Climate Change., Routledge. 2022; 153–78.
García-Mozo H, Oteros JA, Galán C. Impact of land cover changes and climate on the main airborne pollen types in Southern Spain. Sci. Total Environ. 2016; 548:221-8.
Cariñanos P, Casares-Porcel M, de la Guardia CD, Aira MJ, Belmonte J, Boi M, Maray AMV. Assessing allergenicity in urban parks: A nature-based solution to reduce the impact on public health. Environ. Res. 2017; 155:219-27.
Boletín Oficial de la Comunidad de Madrid (BOCM). Resolución de 18 de agosto de 2004, del Director General de Salud Pública, por la que se establece el Comité de Coordinación de la Red Palinológica de la Comunidad de Madrid. BOCM núm. 293, 9 de diciembre de 2004.
Cervigón P, Rojo J, Ferencova Z, Iriarte JMO, Ruiz EA, Gutiérrez-Bustillo AM. La Red Palinológica de la Comunidad de Madrid. Treinta años como sistema de vigilancia e información de polen aerovagante de utilidad en Salud Pública. Rev. Salud Ambient. 2024; 24(2):168-77.
Rojo J, Cervigón P, Ferencova Z, Cascón Á, Díaz JG, Romero-Morte J, et al. Assessment of environmental risk areas based on airborne pollen patterns as a response to land use and land cover distribution. Environmental Pollution. 2024; 344:123385.
Hirst JM. An automatic volumetric spore trap. Ann. App. Biol. 1952; 39:257–65.
Rojo J, Picornell A, Oteros J. AeRobiology: The computational tool for biological data in the air. Methods Ecol. Evol. 2019; 10(8):12731278.
UNE-EN 16868, 2020. Ambient Air-Sampling And Analysis of Airborne Pollen Grains And Fungal Spores for Networks Related to Allergy-Volumetric Hirst Method.
Galán C, González PC, Teno PA, Vilches ED. Manual de Calidad y Gestión de la Red Española de Aerobiología. Córdoba. Servicio de Publicaciones de la Universidad de Córdoba. 2007.
Galán C, Smith M, Thibaudon M, Frenguelli G, Oteros J, Gehrig R, et al. EAS QC Working Group, Pollen monitoring: minimum requirements and reproducibility of analysis. Aerobiologia. 2014; 30:385–95.
Cervigón P, Ferencova Z, Cascón Á, Romero-Morte J, Galán Díaz J, Rojo J, et al. Importance of the quality management of aerobiological monitoring networks: The case study of Madrid Region in Spain. Sci. Total Environ. 2024; 954:176544.
Pérez-Badia R, Rapp A, Morales C, Sardinero S, Galán C, García-Mozo H. Pollen spectrum and risk of pollen allergy in central Spain. Ann. Agric. Environ. Med. 2010; 17(1):139-51.
Elvira-Rendueles B, Moreno JM, Costa I, Bañón D, Martínez-García MJ, Moreno-Grau S. Pollen calendars of Cartagena, Lorca, and Murcia (Region of Murcia), southeastern Iberian Peninsula: 2010–2017. Aerobiologia. 2019; 35:477-96.
ELHassani L, Boullayali A, Janati A, Achmakh L, Bouziane H. Aerobiological study of airborne pollen in Tétouan (NW of Morocco): diversity, intensity and calendar. Aerobiologia. 2022; 38(4):483-99.
Cariñanos P, Casares-Porcel M. Urban green zones and related pollen allergy: A review. Some guidelines for designing spaces with low allergy impact. Landsc. Urban Plan. 2011; 101(3):205-14.
Cariñanos P, Ruiz-Peñuela S, Valle AM, de la Guardia CD. Assessing pollination disservices of urban street-trees: The case of London-plane tree (Platanus x hispanica Mill. ex Münchh). Sci. Total Environ. 2020; 737:139722.
Lara B, Rojo J, Fernández-González F, Pérez-Badia R. Prediction of airborne pollen concentrations for the plane tree as a tool for evaluating allergy risk in urban green areas. Landsc Urban Plan. 2019; 189:285-95.
Hidalgo PJ, Galán C, Domínguez E. Pollen production of the genus Cupressus. Grana. 1999; 38(5):296-300.
Molina RT, Rodríguez AM, Palaciso IS, López FG. Pollen production in anemophilous trees. Grana. 1996; 35(1):38-46.
Cervigón P, Ferencova Z, Cascón Á, Romero-Morte J, Díaz JG, Sabariego S, Rojo J, et al. Progressive pollen calendar to detect long-term changes in the biological air quality of cities in the Madrid Region, Spain. Landsc Urban Plan. 2024; 247:0169-2046,
Díaz-Pacheco J, García-Palomares JC. Urban Sprawl in the Mediterranean Urban Regions in Europe and the Crisis Effect on the Urban Land Development: Madrid as Study Case. Urban Stud. Res. 2014; 807381.
Katz DSW, Robinson GS, Ellis A, Nowak DJ. The effects of tree planting on allergenic pollen production in New York City. Urban For. Urban. 2024; 92:128208.
Lara B, Rojo J, Fernández-González F, González-García-Saavedra A, Serrano-Bravo MD, Pérez-Badia R. Impact of plane tree abundance on temporal and spatial variations in pollen concentration. Forests. 2020; 11(8):817.
Anderegg WRL, Abatzoglou JT, Anderegg LDL, Bielory L, Kinney PL, Ziska L. Anthropogenic climate change is worsening North American pollen seasons. Proc. Natl. Acad. Sci. U. S. A. 2021; 118(7):e2013284118.
de Weger LA, Molster F, de Raat K, den Haan J, Romein J, van Leeuwen W, et al. A new portable sampler to monitor pollen at street level in the environment of patients. Sci. Total Environ. 2020; 741:140404.
Katz DSW, Batterman SA. Urban-scale variation in pollen concentrations: A single station is insufficient to characterize daily exposure. Aerobiologia. 2020; 36(3):417–31
López-Orozco R, García-Mozo H, Oteros J, Galán C. Long-term trends and influence of climate and land-use changes on pollen profiles of a Mediterranean oak. forest. Sci. Total Environ. 2023; 897:165400.
Ravindra K, Goyal A, Mor S. Influence of meteorological parameters and air pollutants on the airborne pollen of city Chandigarh, India. Sci. Total Environ. 2022; 818:151829.

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