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Hamaoui-Laguel L.,CEA Saclay Nuclear Research Center | Hamaoui-Laguel L.,INERIS | Vautard R.,CEA Saclay Nuclear Research Center | Liu L.,International Center for Theoretical Physics | And 11 more authors.
Nature Climate Change

Common ragweed (Ambrosia artemisiifolia) is an invasive alien species in Europe producing pollen that causes severe allergic disease in susceptible individuals. Ragweed plants could further invade European land with climate and land-use changes. However, airborne pollen evolution depends not only on plant invasion, but also on pollen production, release and atmospheric dispersion changes. To predict the effect of climate and land-use changes on airborne pollen concentrations, we used two comprehensive modelling frameworks accounting for all these factors under high-end and moderate climate and land-use change scenarios. We estimate that by 2050 airborne ragweed pollen concentrations will be about 4 times higher than they are now, with a range of uncertainty from 2 to 12 largely depending on the seed dispersal rate assumptions. About a third of the airborne pollen increase is due to on-going seed dispersal, irrespective of climate change. The remaining two-thirds are related to climate and land-use changes that will extend ragweed habitat suitability in northern and eastern Europe and increase pollen production in established ragweed areas owing to increasing CO 2. Therefore, climate change and ragweed seed dispersal in current and future suitable areas will increase airborne pollen concentrations, which may consequently heighten the incidence and prevalence of ragweed allergy. © 2015 Macmillan Publishers Limited. Source

Thibaudon M.,Reseau National de Surveillance Aerobiologique | Thibaudon M.,University of Strasbourg | Sauleau E.-A.,Groupe methodologique de recherche clinique | Sauleau E.-A.,University of Strasbourg | And 10 more authors.
Revue Francaise d'Allergologie

An increase in respiratory diseases during stormy summer periods has been noted for many years. The purpose of this study, besides a literature search, was to relate different aerobiological parameters (concentrations of molds and pollens), weather (temperature, relative humidity, rainfall and storms), and air pollution (PM10, PM2,5, O3, NO2...) to hospitalizations based on emergency department data or "SOS médecins" calls for serious respiratory problems. The current study was carried out in the summer seasons from 2008 to 2013 with the help of the personal of the Pulmonary and Allergy department, the Division of Public Health and the Emergency Department of the Strasbourg University Hospital, "SOS médecins" in Strasbourg, as well as the RNSA (Réseau national de surveillance aérobiologique), the ASPA Alsace, Météo-France and Météorage. Among aerobiological parameters, a sharp increase in concentrations of Didymella sp. was observed during stormy periods. These periods also favor occasional increase in respiratory diseases. © 2014 Elsevier Masson SAS. Source

Besancenot J.-P.,Reseau National de Surveillance Aerobiologique | Thibaudon M.,Reseau National de Surveillance Aerobiologique
Revue des Maladies Respiratoires

There is growing evidence to support an increase in air temperature over recent decades, with significant effects on aeroallergens such as pollen. It is generally accepted that the trend will continue, and become even more pronounced in the future. © 2012 SPLF. © 2012 Publié par Elsevier Masson SAS pour la SPLF. Source

Ziello C.,TU Munich | Sparks T.H.,TU Munich | Sparks T.H.,University of Life Sciences in Poznan | Estrella N.,TU Munich | And 25 more authors.

A progressive global increase in the burden of allergic diseases has affected the industrialized world over the last half century and has been reported in the literature. The clinical evidence reveals a general increase in both incidence and prevalence of respiratory diseases, such as allergic rhinitis (common hay fever) and asthma. Such phenomena may be related not only to air pollution and changes in lifestyle, but also to an actual increase in airborne quantities of allergenic pollen. Experimental enhancements of carbon dioxide (CO2) have demonstrated changes in pollen amount and allergenicity, but this has rarely been shown in the wider environment. The present analysis of a continental-scale pollen data set reveals an increasing trend in the yearly amount of airborne pollen for many taxa in Europe, which is more pronounced in urban than semi-rural/rural areas. Climate change may contribute to these changes, however increased temperatures do not appear to be a major influencing factor. Instead, we suggest the anthropogenic rise of atmospheric CO2 levels may be influential. © 2012 Ziello et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Source

Thibaudon M.,Reseau National de Surveillance Aerobiologique | Thibaudon M.,Groupe de Travail Aerobiologie de la Societe Francaise dAllergologie | Caillaud D.,Groupe de Travail Aerobiologie de la Societe Francaise dAllergologie | Besancenot J.-P.,Reseau National de Surveillance Aerobiologique | Besancenot J.-P.,Groupe de Travail Aerobiologie de la Societe Francaise dAllergologie
Revue des Maladies Respiratoires

Introduction.- Pollen is a major cause of allergy and monitoring pollen in the air is relevant for diagnosis, treatment and prevention, as well as for biomedical and biological research. Many aero-biological studies have been conducted all over the world to ascertain aerial concentrations and seasonality of pollen grains. Background.- Monitoring of airborne biological particles is carried out by various gravimetric, impaction, and suction sampling devices. The Hirst trap, later modified to Burkard® or Lanzoni® traps, is the most widely used sampler. Counting and identifying pollen grains is then performed under optical microscopy. Based on differences in airborne pollen recorded over several years of observation, pollen calendars have been drawn up as aids to allergy diagnosis and managementbut they could be replaced advantageously by allergy-risk calendars. Pollen counts also provide valuable information about the geographical origin of pollen grains. Viewpoints.- Since the identifying and counting of pollen grains in ambient air samples is still a demanding and time-consuming task, there is an increasing interest in the automation of pollen monitoring. Furthermore, the divergence sometimes observed between clinical observations and pollen counts provides an incentive to collect aero-allergens directly. Lastly, pollen monitoring could be improved through the use of personal bioaerosol samplers. Conclusions.- Great progress has been made in aerobiology for over a century, but muchremains to be accomplished, particularly in relation with the standardization of methods. © 2013 SPLF. Published by Elsevier Masson SAS. All rights reserved. Source

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