There’s bad news for people in the US who live with hay fever: by the end of the century it’s likely pollen season will be much longer and that pollen counts will be much higher.
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Allergies induced by pollen such as hay fever affect up to 30 per cent of the world’s population. “We have already seen a change in the pollen count in the last few decades,” saysat the University of Michigan. “The increase in pollen in the atmosphere starts earlier now and the main driver of that is temperature change.”
They also found that plants that pollinate later in the year such as grasses may do so up to 19 days later – lengthening pollen season and increasing annual pollen emissions across the US by between 16 and 40 per cent. “But there’s a huge amount of uncertainty in that result as we don’t have a lot of data on the effects of carbon dioxide on pollen,” she says.
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