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Cominciano i tempi difficili per le persone allergiche ai pollini. Le piante di betulla hanno già iniziato a fiorire in tutta la Svizzera, una settimana prima rispetto al solito.
Il clima mite del mese di marzo è la principale causa di questo fenomeno, afferma Regula Gehrig, della divisione di fenologia dell'Ufficio federale di meteorologia e climatologia (MeteoSvizzera), citata in un comunicato del Centro allergie svizzera.
Nei prossimi giorni la concentrazione nell'aria di pollini di betulla, particolarmente aggressivi, sarà alta. Gli alberi fioriranno ancora in maggio.
ats/joe.p.
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