The Met Office has issued a hay fever alertRory Poulter16:08, 07 Jul 2026Britain's hay fever sufferers are being warned that grass and weed pollen counts will change across huge swathes of the country.‌The Met Office's five-day outlook, shared on social media, shows the pollen threat escalating dramatically as the week goes on, with several major cities set to be plunged into the red "very high" category by Friday. In a post on X, the Met Office told the estimated one in five Brits who suffer from the condition that it "might be time to stock up on those antihistamines," warning that pollen levels were forecast to run high to very high nationwide.‌City-by-city breakdownAccording to the Met Office's pollen forecast, London and Exeter face the worst of it, both rated "very high" for grass an