Pollens are a major cause of seasonal allergic diseases. Weather may alter the production of pollens. Increased atmospheric temperatures lead to earlier pollination of many plants and longer duration of pollination, resulting in extended pollen seasons, with early spring or late winter. Longer pollen seasons increase duration of exposure, resulting in more sensitization, and higher pollen concentrations may lead to more severe symptoms. Climate changes in contact to pollens may affect both allergic sensitization and symptom prevalence with severity. The future consequences of climate change, however, are speculative, because the influence on humans, is complex.
Young-Jin Choi, Kyung Suk Lee, Jae-Won Oh, The Impact of Climate Change on Pollen Season and Allergic Sensitization to Pollens, Immunology and Allergy Clinics of North America, Volume 41, Issue 1, 2021, Pages 97-109,,