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Quercus sp. (Oak)



Although there are a number of species, the one which contributes most to the atmospheric load in Madrid and in many other cities throughout Spain is Quercus ilex . Together with the Platanus (Plane tree), this represents the most abundant pollen in Madrid, pollinating in April to June. Although moderate-to-severe cases of asthma may be seen, of sudden onset in April, as a consequence of the sensitisation to the evergreen oak pollen, its global importance in hay fever is relatively small

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