Why Brits Are Urged to Keep Windows and Doors Closed Between 10am and 3pm Wednesday, June 11, 2025 hayfever pollen allergy uk season grasspollen health weather pollencounts prevention As hay fever season sweeps across the UK from late March to September, households are being advised to keep their windows and doors closed, especially between 10am and 3pm. This period coincides with the highest release of … Read More