TY - JOUR T1 - Penetration and remanence of pollen in dwellings JF - European Respiratory Journal JO - Eur Respir J VL - 40 IS - Suppl 56 SP - P1035 AU - Denis Charpin AU - Christian Pichot AU - Michel Calleja AU - Vincent Penel Y1 - 2012/09/01 UR - http://erj.ersjournals.com/content/40/Suppl_56/P1035.abstract N2 - Indoor pollens come from outdoor pollination but the temporal relationship between both phenomenons is poorly documented. In this study, we ried to compute the influx and remanence of various pollen species throughout the pollen season.Material & methodsFive families living in the same street of a suburban community volunteered to participate. Monitoring of indoor pollen counts was performed at 4 occasions (February, April, May and August 2008) through sampling of house-dust from the living room. During the same period, outdoor pollen counts were monitored using a Burkard pollen trap.ResultsVariation of pollen counts over time.Overall, there was a strinking increase in indoor pollen counts during each pollen season: cypress (February), plane tree (April), Poaceae and olive.tree(June).However, away from the pollination period, there was still high number of pollen grains for the main allergenic.Between species differencesTwo groups of species can be defined on the basis of these results: the first group includes Platanus, Quercus and Cupressaceae which exhibit high remanence (0.4) and a low penetration, and the second group contains species with high penetration but various remanences).Time period effectIncreasing values were observed along seasons: from very low (2.6, p value=3%) in winter, to moderate in spring (13 to 15, p value=0.001% and 0.001%) and hudge in summer (204, p value=0.10%). Remanence coefficients were never significant.DiscussionBoth pollen species, housing and the sampling time period have bearing on penetration and remanence of pollen grains indoor. These pollen could then interact with the allergic patients who could get symptom away from the pollination period. ER -