If your hay fever feels more severe and lasts longer each year, you are not alone—and it’s not just in your head. Recent research reveals that sufferers today endure pollen allergies for up to two weeks longer than in the 1990s. This alarming trend is closely linked to the effects of climate change, which is extending the duration of pollen seasons across Europe.
How Climate Change Prolongs Pollen Seasons
A comprehensive review published in the 2026 Lancet Countdown in Europe report highlights that global warming is altering the flowering cycles of plants that produce allergenic pollen. The study examined changes in the timing and intensity of pollen release from key tree species such as birch, alder, and olive.
Between 2015 and 2024, the pollen season for these allergenic trees began one to two weeks earlier compared to the period from 1991 to 2000. This shift means that individuals sensitive to pollen face a longer period of exposure, intensifying their symptoms and overall discomfort.
Dr. Samantha Walker, Director of Research and Innovation at Asthma and Lung UK, explains the real-world impact: “A longer pollen season will bring more misery for people with hay fever.” She warns that pollen allergies do not merely cause sneezing and itching—these allergens can inflame the airways, triggering serious respiratory issues.
“For those allergic to pollen, this inflammation can lead to frightening breathing difficulties, including potentially life-threatening asthma attacks and flare-ups of chronic obstructive pulmonary disease (COPD),” Dr. Walker adds.
The Growing Burden of Hay Fever in the UK
Hay fever is a widespread problem affecting millions across the UK. Anne Biggs from Allergy UK emphasizes the importance of understanding these changes: “Research into the timing and length of pollen seasons is vital. Detailed information on longer pollen seasons is essential for managing allergic conditions linked to pollens and air quality.”
The new findings come from a report on climate change and health in Europe published in The Lancet Public Health. It was compiled by 65 researchers from 46 academic and United Nations institutions, underscoring the global scientific consensus on the issue.
In parallel, a separate allergy strategy developed by charities, patient groups, and medical professionals highlights the UK’s staggering allergy rates. Approximately 39% of children and 30% of adults in the UK suffer from some form of allergy, ranking the country among the highest in the world for allergic conditions.
However, the strategy raises serious concerns about the state of allergy care in the NHS, noting that treatment and resources are “dramatically under-resourced.” This shortfall leaves many patients without adequate support to manage increasingly severe symptoms driven by environmental changes.
What This Means for Hay Fever Sufferers and Public Health
The extension of the pollen season due to climate change presents significant challenges for millions of allergy sufferers. Longer exposure to allergens not only worsens daily symptoms but also heightens the risk of severe respiratory complications.
Public health systems must adapt to these environmental shifts by prioritizing allergy research, improving diagnostic services, and ensuring access to effective treatments. Increased awareness and better management strategies can help mitigate the impact of prolonged pollen seasons on vulnerable populations.
For individuals prone to hay fever, staying informed about local pollen forecasts and adopting protective measures—such as limiting outdoor activities during high pollen days—can reduce symptom severity. Healthcare providers also need to prepare for a growing demand for respiratory and allergy care as climate-related risks escalate.
Ultimately, this research underscores the broader health consequences of climate change, extending beyond temperature rises to the very air we breathe. Addressing these issues requires coordinated action across environmental policy, healthcare, and public awareness to protect those most affected by worsening hay fever seasons.
