Fall Allergy Season Extends Due to Climate Change and Pollution
Fall Allergy Season Extends Due to Climate Change and Pollution
US · Published Oct 23, 2026
• According to a report by Earth.com, the fall allergy season in the U.S. is lasting longer, with air pollution and climate change playing significant roles. Ragweed, a major allergen, continues to release pollen until the first hard frost, which is now occurring later in the year. Data from Climate Central shows that the frost-free period in 177 U.S. cities has extended by an average of 11 days between 1970 and
• Additionally, a 2021 study found that pollen seasons have started 20 days earlier and lasted eight days longer, with a 21% increase in pollen levels. Air pollution, particularly nitrogen dioxide from traffic, has been shown to increase the allergenic properties of ragweed pollen, further exacerbating symptoms for allergy sufferers.

Impact & Risks

The extended allergy season affects approximately one in seven Americans who are allergic to ragweed pollen, as reported by the Asthma and Allergy Foundation of America (AAFA). Prolonged exposure to allergens can lead to increased respiratory issues, including asthma attacks, and exacerbate other health conditions. Urban areas with higher levels of air pollution may experience more severe impacts due to the interaction between pollutants and pollen. The situation underscores the need for both individual precautions and broader environmental policies to mitigate the effects of climate change and air pollution on public health.

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