The United Kingdom is experiencing a significant spike in pollen levels, with the Met Office issuing a warning for a "pollen bomb" expected to last for the next four days. This comes as the country continues to grapple with a heatwave, which authorities suggest may be contributing to the elevated pollen counts.
Areas in the west and south of the UK are anticipated to be the most affected, facing "very high" pollen levels, which are forecast to remain "high" throughout the coming days. While grass pollen typically peaks in June, weed pollen is also a significant factor currently, particularly in Wales and southwest England. Parts of Northern Ireland will see "moderate" levels, while many regions in Scotland, northern England, and the Midlands will experience consistently "high" counts. Conversely, northern Scotland, including Orkney and Shetland, is expected to have low pollen levels.
The Met Office attributes the current conditions to a combination of warm, dry weather with light winds, which facilitates pollen release and dispersal, and a lack of rainfall to wash pollen from the air. Recent spells of sunshine and rain have also provided ideal growing conditions for grasses and weeds. Warm, dry, and breezy days are generally the worst for hay fever sufferers, as they allow pollen to spread efficiently. Calm, dry days can also lead to high local concentrations.
The ongoing heatwave, predicted to last for another 10 days, could prolong the period of misery for those with hay fever. The Met Office notes that cooler conditions, higher humidity, and rainfall tend to temporarily reduce airborne pollen.
Hay fever affects a significant portion of the UK population, with estimates suggesting between 15 and 20 percent are impacted. Symptoms often begin in childhood and can persist throughout life, though some individuals develop the condition later in adulthood. Theories for sudden onset include mild childhood symptoms, the "hygiene hypothesis" suggesting reduced exposure to infections weakens the immune system, exposure to new environments with higher pollen counts, or even exacerbation by pollution. A weakened immune system following illness or severe stress may also play a role.