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Allergy Seasons Grow Longer and More Intense Across the U.S. Due to Climate Change

Cities like El Paso and regions such as the Bay Area and Southern New England are experiencing significant changes in allergy season duration and intensity.

“We’re seeing things start earlier and earlier, and being a little more intense than what we’ve seen in the past,” says Dr. Jyothi Tirumalasetty, a clinical assistant professor of allergy and immunology at Stanford.
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Overview

  • Climate change is leading to longer and more intense allergy seasons across the U.S., with some cities experiencing significant increases in the duration of their allergy seasons.
  • El Paso, Texas, has seen one of the most dramatic increases, with its allergy season growing approximately 47 days longer since 1970.
  • In the Bay Area, climate change is causing higher pollen counts earlier in the year, exacerbating seasonal allergy symptoms.
  • Southern New England, including Rhode Island, is experiencing an early and intense allergy season due to a mild winter and warm, wet spring.
  • While some U.S. cities have seen shorter allergy seasons, the overall trend is towards longer and more intense allergy periods due to global warming.