At this time of year, across almost the entire country, “the air has significant levels of pollen grains with high allergenic capacity, such as those from grass, parietaria, plantain and chenopodium and olive trees”.

According to forecasts, until Thursday (May 5th) in the Lisbon and Setúbal region, pollens are at very high levels, with a predominance of olive and oak trees, nettle herbs, parietaria herbs, grasses, plantain and chenopodium.

In Porto (between the Douro and Minho region), pollens are found at very high levels, especially oak, pine and nettle grass.

According to SPAIC forecasts, in the region of Trás-Os-Montes and Alto Douro, pollens are found at very high levels, especially oaks, pine and birch, grasses and parietaria.

In Coimbra (Beira Litoral region), they are also very high, with a predominance of pollen from olive and oak trees, nettle herbs, parietaria and grasses.

Also in the Beira Interior region, pollens are found at very high levels, especially pollens from holm oaks and other oaks, pine, olive, grassy herbs, plantain, nettle and sorrel.

In the Alentejo region the levels are also high in the atmosphere, with a predominance of pollens from holm oak trees, other oaks, olive trees, grassy herbs, plantain, nettle, sorrel and parietaria.

In the Algarve region, also with high levels, pollen from olive trees, holm oaks and other oaks, grassy herbs, plantain, chenopodium and nettles dominate.

Low levels of pollen in the atmosphere are expected for the Azores and Madeira Archipelagos.

According to SPAIC, outdoor activities should be avoided when pollen concentrations are high.

“Walking in the garden, mowing the lawn, camping or playing outdoor sports will increase your exposure to pollens and your risk for allergies,” they add.