Allergy season has already been lengthened by climate change, and sufferers can expect it to be twice as long by the end of the century, scientists say
The arrival of spring brings with it allergy season for millions of people around the world as flowering trees and plants release allergy-inducing pollens. Now, thanks to climate change, allergy season is about to get worse: The warming planet is extending the growing season, and along with it allergy-caused risks to human health.
The new research extends this picture to the end of the century, attributing a 40 percent increase in pollen produced to a pollen season that will begin as much as 40 days earlier and stretch out 19 days longer., an atmospheric scientist at the University of Michigan and senior author of the paper. “So many people are affected by seasonal allergies, yet predictive models for pollen are really not that good.
“Our simulation looks at pollen emissions day by day,” Steiner says. “And you can see the progression—it starts in the Southeast, and then, as temperatures warm, the line of pollen production moves to the North.” Using these models, Steiner and colleagues then compared the amount of pollen released in the continental United States during a historical period and two prospective: a middle-of-the-road greenhouse gas emission future and a more extreme, fossil-fuel-driven one, representing an increase of 2-3 °C and 4-6 °C, respectively. The more dire scenario, in which carbon dioxide concentrations reach more than 2.
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