Harvard and National Institutes of Health (NIH) experts are warning that climate change is exacerbating pollen allergies and extending the allergy season beyond spring. Rising temperatures and increased carbon dioxide levels are contributing to higher pollen production and more potent allergens. This change means individuals are now experiencing allergic reactions during winter months, a previously uncommon occurrence. Researchers have found that the pollen itself is becoming more irritating due to climate-related factors. The experts emphasize the need for awareness and preventative measures as allergy symptoms become more frequent and severe. This shift presents new challenges for public health and requires adaptation in allergy management strategies.