Quantitative assessment of coagulation of atmospheric particles onto airborne birch pollen grains

Choël, M.; Ivanovsky, Anastasia; Roose, Antoine; Hamzé, Mona; Blanchenet, Anne-Marie; Visez, Nicolas

doi:10.1016/j.jaerosci.2021.105944

Cited by 4 publications

(7 citation statements)

References 44 publications

(55 reference statements)

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“…The relative contribution of these three mechanisms on the deposition of APM on PGs was previously completely unknown (Visez et al 2020). By comparing the surface concentration of APM on BPG from this work and the one from the work of Choël et al (2022), the deposition of APM on BPGs appears to take place mainly during the windborne transport of PGs. More precisely, a number of particles more than 8 times higher was observed on BPGs collected directly from the atmosphere (BPGs carried an average of 0.86 particles) compared to BPGs collected from catkins (0.1 particle per PG) (Choël et al 2022).…”

Section: Discussionmentioning

confidence: 75%

“…By comparing the surface concentration of APM on BPG from this work and the one from the work of Choël et al (2022), the deposition of APM on BPGs appears to take place mainly during the windborne transport of PGs. More precisely, a number of particles more than 8 times higher was observed on BPGs collected directly from the atmosphere (BPGs carried an average of 0.86 particles) compared to BPGs collected from catkins (0.1 particle per PG) (Choël et al 2022). The study by Choël et al (2022) was carried out under conditions of similar air particulate load: 26.3 µg.m -3 for PM10.…”

Section: Discussionmentioning

confidence: 88%

“…More precisely, a number of particles more than 8 times higher was observed on BPGs collected directly from the atmosphere (BPGs carried an average of 0.86 particles) compared to BPGs collected from catkins (0.1 particle per PG) (Choël et al 2022). The study by Choël et al (2022) was carried out under conditions of similar air particulate load: 26.3 µg.m -3 for PM10. The relative significance of contamination by coagulation processes between windborne PGs and APM by deposition-resuspension still remains unknown.…”

Section: Discussionmentioning

confidence: 94%

“…More nuanced conclusions on the effect of industrial pollution on the germination capacity of PGs have been drawn from field works (Helander et al 1997;Kozlov and Zvereva 2004). Laboratory studies seeking to evaluate the effects of APM on in vitro germination should use realistic amounts of particles deposited on pollen as close as possible to those observed in the atmosphere (0.86 particles per PG) (Choël et al 2022). Finally, to understand the overall effects of APM on birch reproduction, the deposition of particles on female catkins should be further investigated.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, sampling of BPGs in low-polluted urban air (average PM10 = 26.3 µg•m -3 ) has enabled to estimate the average pollution of BPGs at 0.86 particles deposited per PG (Choël et al 2022). Airborne sampling of BPGs does not allow to elucidate timing of pollution of BPGs surface by APM.…”

Section: Introductionmentioning

confidence: 99%

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Atmospheric particulate matter deposition on birch catkins and pollen grains before pollination

et al. 2022

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Birch is the most allergenic tree species in northern and central Europe. Airborne birch pollen concentrations are observed to be on the rise for several decades. Health hazard due to birch pollen grains (BPGs) can worsen due to particulate air pollution.The prevalence of the intimate mixture of BPGs with atmospheric particulate matter (APM) at the single pollen grain level is still unraveled. In this study, APM transfer mechanisms to birch catkins and BPGs prior to pollination were investigated at an urban-industrial and a peri-urban site in northern France. The surface of catkins was heavily polluted with micrometer-sized particles. Conversely, BPGs were relatively unpolluted with on average 0.1 particle.BPG -1 . Differences in the chemical composition of adhered particles were observed as a function of the sampling sites.In contrast, no significant difference was found in terms of surface concentrations of APM adhered to BPGs and catkins between the two sites. Comparison of the number of particles deposited per pollen grain according to whether they were harvested from catkins or collected while airborne suggests that particulate pollution of pollen occurs preferentially after pollen shedding, either by impaction or coagulation mechanisms with other suspended APM or by pollen settling on dust-contaminated surfaces followed by resuspension.

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Section: Discussionmentioning

confidence: 75%

Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Atmospheric particulate matter deposition on birch catkins and pollen grains before pollination

et al. 2022

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Uptake of ozone by allergenic pollen grains

Visez,

Hamzé,

Vandenbossche

et al. 2023

Environmental Pollution

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Measurement Report: Comparative Analysis of Fluorescing African Dust Particles in Spain and Puerto Rico

Sarangi,

Baumgardner,

Calvo

et al. 2024

Preprint

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Abstract. Measurements during episodes of African dust, made with two Wideband Integrated Bioaerosol Spectrometers (WIBS), one on the northeastern coast of Puerto Rico and the other in the city of León, Spain, show unmistakable, bioaerosol-like fluorescing aerosol particles (FAP) that can be associated with these dust episodes. The Puerto Rico events occurred during a major incursion of African dust during June 2020. The León events occurred in the late winter and spring of 2022 when widespread, elevated layers of dust inundated the Iberian Peninsula. Satellite and back trajectory analyses confirm that dust from Northern Africa was the source of the particles during both events. The WIBS measures the size of individual particles in the range from 0.5 µm to 30 µm, derives a shape factor and classifies seven types of fluorescence from the FAP. In general it is not possible to directly determine the specific biological identity from fluorescence signatures, however, measurements of these types of bioaerosols in laboratory studies allow us to compare ambient fluorescence patterns with whole microbial cells measured under controlled conditions. Here we introduce some new metrics that offer a more quantitative approach for comparing FAP characteristics derived from particles measured under different environmental conditions. The analysis highlights the similarities and differences at the two locations and reveals differences that can be attributed to the age and history of the dust plumes, e.g., the amount of time that the air masses were in the mixed layer and the frequency of precipitation along the air mass trajectory.

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Quantitative assessment of coagulation of atmospheric particles onto airborne birch pollen grains

Cited by 4 publications

References 44 publications

Atmospheric particulate matter deposition on birch catkins and pollen grains before pollination

Atmospheric particulate matter deposition on birch catkins and pollen grains before pollination

Uptake of ozone by allergenic pollen grains

Measurement Report: Comparative Analysis of Fluorescing African Dust Particles in Spain and Puerto Rico

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