[Report of the activity of RNSA (National Aero-biological Surveillance Network), 2003].
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Air Pollutants↗
Biomedical subjects
M Thibaudon
Publications and source records attributed to M Thibaudon.
[How to predict the date of the start of the pollination of a plant from the meteorological data: the example of ragweed at Lyon].
The pollen of Ambrosia, highly allergenic, can be found in high quantities in the French regions of Burgundy, Auvergne and mostly a great part of the Rhône-Alpes region. The aim of this study was to establish some forecast models of the Starting Date of the Pollen season (SDP) of Ambrosia, in order to provide early information to allergists and allergic people. The pollen data came from the Hirst trap set up in Lyon since 1987 by the RNSA, and the meteorological data for the same period were provided by Météo-France. Two models were used, a sum of daily average temperatures and a multiple regression on all the 10-day period meteorological data. The results were quite accurate, except for 2003 with the temperature sums, probably because of very special meteorological conditions. So the models will have to be updated in this way.
Air↗
[Description and value of the Microvision system for pollen analysis].
Currently, two techniques of analysis are classically used by the aerobiological networks: the technique of the 12 vertical lines allow to follow the evolution by bi-hourly periods of pollination, but the segmentation of the sample doesn't allow to visualise pollen clouds of short duration; the technique of 2 or 3 horizontal lines allow to follow the daily evolution, but only the daily totals are recorded. The MICROVISION system adapted by the RNSA to the pollen analysis allow to keep the horizontal method, which is faster and continue, and to record automatically in the database the hourly or bi-hourly data. So each pollen is recorded by its coordinates with a precision of 1 micron (1.8 seconds). First, we realised a cartography of the impaction of the pollen grains on the strip, in order to locate the more representative horizontal lines. Secondly, the coupling of the microscope with the Microvision system and the software of data acquiring elaborated by the RNSA allow to propose a more reliable and faster procedure for pollen analysis.
Air↗
[Ambrosia pollen under high surveillance].
The pollinic season of ambrosia in 2003 present strong disturbances due to the meteorology of the end of this summer. The areas with the allergenic risk are concentrated on the area of Rhône-Alpes (more than 40 days with a risk equal to or higher than 3) and on the peripheral areas: the area Centre Auvergne with Saint Etienne, Clermont-Ferrand and Montlucon with approximately 10 days with a the allergenic risk equal to or higher than 3; the Saône-Savoie area with the towns of Macon and Grenoble with about twenty days with a allergenic risk equal to or higher than 3 and Dijon, Châlon-sur-Saône with 6 days with a allergic risk equal to or higher than 3; the Mediterranean area with the towns of Avignon and Aix-in-Provence presenting ten days with allergenic risk equal to or higher than 3, Marseille and Toulon with 7 days with a allergenic risk equal to or higher than 3. The allergic risk related to the ambrosia in 2003 had peaks overall less high, but the season is spread out and had during until September 20. The daily peaks for the Rhône-Dauphiné-Drôme area were noted between 6 h and 8 h or 8 h and 10 h, for 2003. On the peripheral areas, we remark a diversity of the daily peaks (Châlon-sur-Saône between 18 h and 20 h). Are these pollens local grains or immigrants grains? On Lyon I (Gerland), the follow-up of the data of the ambrosia since 1987 permit to remark a stagnation of the number of days with an allergic risk, despite a reduction of the number of pollens.
Air↗
[Report of RNSA (Réseau National de Surveillance Aérobiologique) activities, 2002].
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Annual Reports as Topic↗
[Evolution of pollinization in France (2002)].
It was traditional until these last years to supervise the evolution of pollination by taking account only of the evolution of the number of grains of pollens present per m3 of air per year on each site. If this factor is significant, it is not sufficient. Indeed, it is essential to be able to supervise the evolution of the number of days in the year when the allergic risk related to a pollen is significant. The work which is presented shows over the years 1992 to 2002, for some sites of the RNSA (Amiens, Paris, Rouen, Strasbourg, Montlucon, Bordeaux, Lyon, Marseille, Toulouse) that there can be parallelism of the curves "pollinic counts" and "allergic risk", but also of light discordances. Should a thorough study of the dates of appearance supplement this work because these modifications can be the consequence of the climatic motions of these last decades.
Air↗
[Ragweed in France and the Rhône-Alpes region (Lyon, Bourgoin, Grenoble, Roussillon].
Ragweed in France is a rather recent pollen which causes strong allergies on the populations concerned. This pollen, mainly located in the area Rhone-Alpes, extend more and more on totality of France. Indeed, the pollinic data highlight the presence of ragweed on all the territory with very low, as for Brittany, to several hundreds grains in the area of Rhone-Alpes. So four towns of this area have followed closely the extend of this pollen during the year 2002 through five pollen-traps (2 for the town of Lyon). The trap of Lyon I (Gerland) made it possible to follow temporal the extend of ragweed from 1987 to 2002 and the increase of the number of grains as that of the number of days with a significant allergic risk. The study shows also the differences in quantity of pollens, the differences between the daily allergic risks of the five sites, as well as the differences, between the cities, of the number of days when the allergic risk is significant. It is necessary that pollen of ragweed can be followed closely because of its strong allergenic capacity, in the area of Rhone-Alpes, where the plant prevails mainly, but also on the totality of the own territory, this to supervise its evolution and the speed of proliferation of the plant.
Air↗
[The French Airborne Pollen Network: current situation and prospects for improvement].
The french network of aeropalynology includes traps very close together and vast areas without any trap as well. A study was launched in order to optimise this network, without the number of traps increasing too much. Five criteria are successively reviewed to rationalise the spatial cover. Equi-distance of sites has to be balanced by the number of concerned people. But the need for having long time series is incentive to delete only as a last resort the traps which are reliable for a long time. Moreover, apart from the general network, some local or regional features make indispensable a trap in such-and-such a place (health resort), or justify a higher density of traps in such-and-such an area (the Rhône-Alpes concerning ragweed, the Mediterranean South concerning cypress).
Air↗
[The pollen-associated allergic risk in France].
The principal objective of the French aerobiology Network (RNSA) is to provide to the doctors, the authorities of health and general public, information on the allergic risk related to pollens. To provide only information on the pollinic contents of the air is not sufficient, it acts of past information which can only contribute to the comprehension of some symptoms. On the other hand, by using these last pollinic data, of clinical information present and weather forecasting, it becomes possible to establish information on the Allergic Risk related to such or such pollen, or their whole for the days to come. Thus the RNSA, with more than fifteen years of data of pollinic and clinical present information, could establish correlations enabling him to provide an index of allergic risk going from 0 to 5 (0 = no one; 1 = very weak; 2 = weak; 3 = average; 4 = high; 5 = very high) dependent of: the pollinic accounts, the geographical situation of each site, the weather forecasting for each site, the period of the year, the type of taxa etc. This index makes it possible to provide information accessible to all and useful for the situation present and to come.
Air↗
[Creation and validation of the SPRING Internet site].
The Internet SPRING site has been created by five pollen european nets in relation with the spanish telephony firm: SADIEL. The aim of this project is to propose different services for persons concerned by pollen allergy (patients, scientists, pharmaceutical firms...) and to provide forecasts across Europe. The project validation was done during four months, comparing forecasts, announced on the site, with the real data obtained weekly by the analysts. Each country was divided in several zones and each zone controlled by three or four analysis sites. For France, six zones were identified and controlled. Others european nets want to joint now the SPRING project and everybody concerned by pollens could be informed daily (by phone or wap) of the pollen concentrations and the allergenic risk in each part of Europe.
Cell Phone↗
[Report of the activities of the National Aerobiological Surveillance Network, 2001].
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Air↗
[The Poaceae pollen season in France in 2001].
The aim of this study was to determine the main characteristics of the Poaceae pollen season in France (seasonal and daily quantities) in 2001, and to compare them to those of the previous years. The data came from seven volumetric Hirst traps, located in the cities of Amiens, Paris, Lyon, Nîmes, Bordeaux, Montluçon and Strasbourg. The study period range from the beginning of March to the end of August. The pollen quantities of 2001 were particularly high in three sites (Montluçon, Bordeaux et Lyon); they were higher than those of 2000 in Amiens and Strasbourg, but in those sites the peak of the whole series was situated in 1994; lastly the pollen quantities of 2001 were little different or lower than those of 2000 in Nîmes and Paris. This was probably not without effect on allergic people.
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[Ambrosia pollination: Lyon--Dauphiné--Isère, 2001].
Within the framework of the decrees taken on the departments of Isère and Rhone concerning the protection of the population with respect to ambrosia, the object of this study is to relate the analysis of the daily pollen counts in the of air along the Lyon-Grenoble axis. With this intention, three sensors of the type HIRST were positioned according to standards of the European networks in Lyon-Gerland, Bourgoin-Jallieu and Grenoble. The results presented show the curves of the daily pollen counts on the three sites and by indicating the allergic thresholds of risks associated defined by the RNSA. The number of days with high risk, for each of the three sites, can thus be compared. Experiment must be prolonged to follow, these comparative results and moreover, possible effectiveness of the obligations of pulling up of the plant on atmospheric pollination.
Air↗
[Ambrosia pollen in Switzerland--produced locally or transported?].
The ambrosia (Ambrosia artemisiifolia L.) has been announced in Switzerland for more than 100 years. During the last decade, signs of an increased presence of the ambrosia and its pollen appear in the south-west of Switzerland, in particular in Geneva. Aerobiologic measurements make it possible to highlight the importance of the transport of pollen by the winds since the area of Lyon, where the ambrosia is abundant. It also bring elements making it possible to detect a local production of pollen in the Geneva area, where several invaded fields were discovered with the autumn 2001. A multidisciplinary group was created in Geneva and it attempts to prevent as far as possible probable invasion of the ambrosia.
Asteraceae↗
[Allergo-Pollen Bulletin. "National Bulletin" assessment 2001].
The article gives the assessment of the weekly results published in the National Bulletin of RNSA: 35 bulletins were published, 46 sites sent results. Of the tables indicate: the dates of pollen traps departure to record counting for each site 2001, the number of bulletins published over four years, a comparison over six years and one 28 weeks principal period of number of weeks lost for the publication. A histogram shows the evolution of the number of results published per week in 2000 and 2001.
Environmental Monitoring↗
[Temporal and geographic development of the main allergenic pollens in France: 1987-2001].
At various occasions, we presented the temporal and geographical evolution of pollination during ten to fifteen last years on various sites of the French network. The year 2000 had shown often different characteristics for some tax for part of the towns of France. An hypothesis had been suggested blaming the great storm at the end of December 1999. Work presented has pure goal to prolong of one year (2001) the curves of evolution of all taxa and those of main allergenic pollens so, the share to consolidate or not the assumption 2000 and the another share, to present the assessment of pollination during the season 2001.
Biological Evolution↗
[Study of the coverage of pollen capture in Lyon over three seasons (1999, 2000, 2001)].
For the third consecutive year, the two sensors of the type HIRST of the National Network of aerobiology monitoring (RNSA) worked on the agglomeration of Lyon. The primary trap (Lyon 1) is located at 26 m height on a roof in southern zone of Lyon (district of Gerland), the second (Lyon 2) is located in northern zone of the city (district of Vaise) on a roof at 15 m height compared to the ground. The study of the daily variations of the pollinic counts over the first two years had shown a perfect parallelism for pollens of trees, Poaceae and Urticaceae. Only the curves of pollens of ambrosia presented different layouts between the two pollen traps. The study of this third year makes it possible to consolidate the proceeding results and to appreciate the value of the cover of a Hirst pollen trap in urban implantation within the framework of the allergo-pollinic monitoring.
Environmental Monitoring↗
[Influence of the height position of two pollen traps in Amiens].
The object of this study is to compare the results obtained in 2001 with those of the previous years and to continue the study started two years ago, making it possible to compare the daily pollinic accounts observed on two pollen traps located at the same place (Faculty of Science in Amiens), but at different heights. The primary trap is located on the roof of faculty (approximately 15 m of the ground) and the other on the ground of the same building.
Environmental Monitoring↗