The districts of Faro in the Algarve and Castelo Branco in Beira Interior are set to experience an elevated risk of pollen in the atmosphere starting Friday, according to the Portuguese Society of Allergology and Clinical Immunology (SPAIC).
SPAIC forecasts indicate that the rest of the mainland will face a low to moderate risk, while the autonomous regions of Madeira and the Azores are expected to have low pollen levels during the week of May 9 to 15.
Regions such as Vila Real, Entre Douro e Minho, Beira Litoral, the district of Lisbon, and Alentejo are predicted to have low or moderate risk levels.
The pollen grains currently observed in the atmosphere predominantly come from olive, pine, birch, cork oak, and oak trees, as well as grasses, plantain, sorrel, nettle, and urticaceae (including parietaria).
The period from February to October sees the highest total pollen concentrations, with peaks typically occurring from April to July.
Pollen from grasses, trees, and shrubs is usually the most significant in inducing allergic symptoms.
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