Study sheds light on correlation between allergy seasons, pollens ANI | Updated: Feb 28, 2021 16:03 IST Munich [Germany], February 28 (ANI): A recent study has shed light on how the length of allergy seasons in Germany are affected by pollens traveling far distances. Allergy sufferers are no strangers to problems with pollen. But now - due to climate change - the pollen season is lasting longer and starting earlier than ever before, meaning more days of itchy eyes and runny noses. Warmer temperatures cause flowers to bloom earlier, while higher CO2 levels cause more pollen to be produced. The effects of climate change on the pollen season have been studied at length, and according to some scientists, has grown by as much as 20 days in the past 30 years, at least in the US and Canada. But one important element is often overlooked - "Pollen is meant to fly," said Dr Annette Menzel, Professor of ecoclimatology at the Technical University of Munich. "Transport phenomena have to be taken into account."