Cluster analysis of variations in the diurnal pattern of grass pollen concentrations in Northern Europe (Copenhagen) and Southern Europe (Cordoba)

Alcázar, Pilar; Ørby, Pia Viuf; Oteros, José; Skjøth, Carsten Ambelas; Hertel, Ole; Galán, Carmen

doi:10.1007/s10453-019-09558-2

Cited by 12 publications

(5 citation statements)

References 38 publications

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“…However, due to the limited effect of height on pollen sampling [29], no large differences were observed and there were only relevant differences for Cupressaceae/Taxaceae, Carpinus and Tilia. This was more likely to be caused by the distribution of the pollen sources rather than differences in height above ground level [38][39][40]. These three pollen types together with Poaceae and Fraxinus showed significant differences between both pollen traps (paired Student t-test; p < 0.05).…”

Section: Abundance Of the Pollen Types In The Airmentioning

confidence: 95%

Land-Use and Height of Pollen Sampling Affect Pollen Exposure in Munich, Germany

et al. 2020

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Airborne pollen concentrations vary depending on the location of the pollen trap with respect to the pollen sources. Two Hirst-type pollen traps were analyzed within the city of Munich (Germany): one trap was located 2 m above ground level (AGL) and the other one at rooftop (35 m AGL), 4.2 km apart. In general, 1.4 ± 0.5 times higher pollen amounts were measured by the trap located at ground level, but this effect was less than expected considering the height difference between the traps. Pollen from woody trees such as Alnus, Betula, Corylus, Fraxinus, Picea, Pinus and Quercus showed a good agreement between the traps in terms of timing and intensity. Similar amounts of pollen were recorded in the two traps when pollen sources were more abundant outside of the city. In contrast, pollen concentrations from Cupressaceae/Taxaceae, Carpinus and Tilia were influenced by nearby pollen sources. The representativeness of both traps for herbaceous pollen depended on the dispersal capacity of the pollen grains, and in the case of Poaceae pollen, nearby pollen sources may influence the pollen content in the air. The timing of the pollen season was similar for both sites; however, the season for some pollen types ended later at ground level probably due to resuspension processes that would favor recirculation of pollen closer to ground level. We believe measurements from the higher station provides a picture of background pollen levels representative of a large area, to which local sources add additional and more variable pollen amounts.

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Section: Abundance Of the Pollen Types In The Airmentioning

confidence: 95%

Land-Use and Height of Pollen Sampling Affect Pollen Exposure in Munich, Germany

et al. 2020

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“…As reported by other papers, the peaks can occur at all hours of day and their variations depend on a complex effect of meteorological factors and distance from the pollen source [50,56]. Analysis of two hours peak resolution have shown differences in relation to areas of sampling due to pollen transport dynamics, with the highest pollen concentrations during daylight hours and maximum intradiurnal values recorded usually between 12 and 14 a.m. and early afternoon [25,26,48,51,53].…”

Section: Two Hour Resolution Analysismentioning

confidence: 60%

“…Different trends of pollen linked to year [39,40], seasonality [41][42][43], daily [44][45][46], intradiurnal [40,[47][48][49][50][51][52] or hourly variations have been reported [27,53,54], and have to be taken into account for the further distinction between urban or non-urban environments [25,26,52,[55][56][57][58]. In this regard, urban and non-urban components around occupational settings add complexity.…”

Section: Introductionmentioning

confidence: 99%

Intercomparison of Indoor and Outdoor Pollen Concentrations in Rural and Suburban Research Workplaces

et al. 2021

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Pollen exposure in occupational settings involves different categories of workers. In this paper the effects of diurnal pollen variations have been evaluated in two sites characterized by different vegetation and urbanization: the suburban site of Tor Vergata (TV) and the rural site of Monte Porzio Catone (MPC). Aerobiological and meteorological monitoring was performed in the two sites during the winter of 2017. The data analysis focuses on the comparison between pollen concentrations observed in relation to meteorological variables. In general, it can be stated that the indoor and outdoor dynamics for MPC and TV are different, with the outdoor concentration of pollen for MPC always higher than for TV, in accordance with significant presence of vegetation. The high nocturnal peaks detected in MPC and completely absent in TV could be caused by the presence of particular conditions of stagnation combined with greater emissions from the pollen sources. Furthermore the higher I/O ratio observed during the working hours in TV compared to MPC could be ascribed to the workers’ behavior. Exposure to pollen can be responsible for several health effects and the knowledge of its level can be useful to improve the evaluation and management of this biological risk.

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“…This advice is probably based on single studies and therefore not sufficient to formulate general recommendations. This is confirmed by the fact that many studies conducted in the last decades comparing circadian patterns of airborne Poaceae pollen between urban and rural sites indicate a less explicit pattern: many studies confirm comparatively low Poaceae pollen concentrations at urban sites during morning hours [10][11][12][13][14]. In addition, high pollen counts were detected in the early evening [11], but also in the morning [15] or with two peaks in the morning and afternoon [12].…”

Section: Introductionmentioning

confidence: 86%

Spatial and Temporal Variations of Airborne Poaceae Pollen along an Urbanization Gradient Assessed by Different Types of Pollen Traps

Jetschni

Jochner-Oette

2021

Atmosphere

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Grass pollen allergy is widespread all around the globe. With an increasing number of people living in cities, the examination of grass pollen levels within cities and their surroundings has increased in importance. The aim of this study was to examine different temporal and spatial scales of grass pollen concentration and deposition across urban and semi-rural environments in the years 2019 and 2020. We installed different types of pollen traps in the city of Ingolstadt (Bavaria, Germany) and its surroundings: volumetric pollen traps at roof level to assess background pollen concentration and gravimetric pollen traps and portable volumetric traps at street level. We considered grass pollen concentration and deposition in the context of land use and management. Our data showed that the grass pollen season in 2020 was longer and more intense than in 2019. Background grass pollen concentration was generally higher at the semi-rural site in both years: peak values were eight times (2019) and more than four times (2020) higher, and Seasonal Pollen Index was more than four times and almost three times higher in 2019 and 2020, respectively. Analyses of spatial variations measured at street level revealed higher numbers for pollen deposition and concentrations at semi-rural than at urban sites. Recorded values were linked to local vegetation and the management of grass areas surrounding the traps. Analyses of diurnal variations at street level in June 2019 showed that pollen concentration for all sites, independent of their degree of urbanization, were highest at noon (22.2 pollen grains/m³ vs. 8.5 pollen grains/m³ in the morning and 10.4 pollen grains/m³ in the evening). Diurnal variations at roof level showed similarities for the same days but differed when considering the whole season. Our data suggest the importance of the management of grass areas as areas cut earlier have a decreased amount of emitted pollen.

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Cluster analysis of variations in the diurnal pattern of grass pollen concentrations in Northern Europe (Copenhagen) and Southern Europe (Cordoba)

Cited by 12 publications

References 38 publications

Land-Use and Height of Pollen Sampling Affect Pollen Exposure in Munich, Germany

Land-Use and Height of Pollen Sampling Affect Pollen Exposure in Munich, Germany

Intercomparison of Indoor and Outdoor Pollen Concentrations in Rural and Suburban Research Workplaces

Spatial and Temporal Variations of Airborne Poaceae Pollen along an Urbanization Gradient Assessed by Different Types of Pollen Traps

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