WASHINGTON (Reuters) – Sneezing, congestion, and runny noses from hay fever may be lasting longer because climate change may be extending pollen seasons, doctors in Italy said on Monday.

Pollen seasons as well as the amount of pollen in the air progressively increased during a 26-year study in Italy, the doctors told a meeting of the American Academy of Allergy, Asthma & Immunology in New Orleans.

The team at Genoa University recorded pollen counts, how long pollen seasons lasted and sensitivity to five types of pollen in the Bordighera region of Italy from 1981 to 2007.

"By studying a well-defined geographical region, we observed that the progressive increase of the average temperature has prolonged the duration of the pollen seasons of some plants and, consequently, the overall pollen load," Dr. Walter Canonica, who worked on the study, said in a statement.