According to the forecast released by the Portuguese Society of Allergology and Clinical Immunology (SPAIC), the rest of the country will be, between May 17th and 23rd, in a low to moderate situation of pollen in the atmosphere.

Unlike Lisbon, Setúbal, Beira Interior, Alentejo, and Algarve, in the regions of Trás-Os-Montes, Alto Douro, Entre Douro, Minho, and Beira Litoral, pollen concentration is expected to remain low to moderate during the weekend, due to the “atmospheric washing” effect, caused by precipitation, which is expected to occur in these regions.

SPAIC adds that the pollen concentration will rise again throughout the week, with the improvement in weather conditions.