SPAIC has indicated that the rest of the mainland will experience a low to moderate risk, while the autonomous regions of Madeira and the Azores are expected to have a low risk in the week of May 9 to 15.
In areas such as Vila Real, Entre Douro e Minho, Beira Litoral, the district of Lisbon, and Alentejo, forecasts predict a low or moderate risk level.
The SPAIC reports that the pollen observed in the atmosphere primarily originates from olive, pine, birch, cork, and oak trees, as well as grass, plantain, sorrel, nettle, and urticaceous plants, including parietaria.
The period between February and October is characterized by the highest total pollen concentrations, with peaks occurring from April to July.
Pollen from grasses, trees, and shrubs typically serves as the most significant trigger for allergic symptoms.
