Mainland Portugal

In the north, in the districts of Vila Real and Porto, the most prominent pollen grains are from cypress, pine, birch, oak, cork oak and holm oak, as well as from grasses, plantain, sorrel, nettle and other Urticaceae.

In Coimbra, in addition to pollen grains from these species, olive pollen is also notable.

In Castelo Branco, the focus is also on pollen released by trees such as cypress, pine, birch, oak, cork oak and holm oak, alongside grasses, sorrel, plantain, nettle and Urticaceae.

In the Lisbon and Setúbal regions, the Allergy Society highlighted, in a statement, pollen from pine, olive, oak, cork oak and holm oak trees, as well as from grasses, sorrel, plantain, goosefoot, nettle and Urticaceae.

In Évora, the highest pollen concentration comes from pine, cork oak and holm oak trees, as well as grasses, sorrel, plantain, nettle and Urticaceae.

In Faro, the most prominent pollen grains come from cypress, pine, olive, oak, cork oak and holm oak trees, as well as from grasses, sorrel, plantain, goosefoot, nettle and Urticaceae.

In the archipelagos

In Funchal (Madeira), the concentration of pollen in the atmosphere is expected to be low, originating from trees such as cypresses, pines, and eucalyptus, as well as from grasses, plantains, and Urticaceae.

In Ponta Delgada (Azores), atmospheric pollen concentration will also be low. “The most prominent pollen in the atmosphere comes from cypress trees (and/or cryptomeria) and also from grasses, plantain, nettle and Urticaceae (including pellitory),” according to the same source.