High temperatures in winter change the allergy calendar: they arrive earlier and the peak is greater. Several cities have had abnormally high and early levels of cypress particles due to a too-warm January.
Madrid, Seville, Toledo, Córdoba, Granada and Bilbao are the ones that have suffered the most. The lack of rain allows particles to remain in the atmosphere longer, and this is combined with pollution, which aggravates respiratory episodes, according to several studies.