Pollen season could be longer, more intense, as climate changes, study finds
both play a role in how much pollen plants produce and emit, since giving plants more food and water makes them grow bigger and produce more pollen. When factoring in carbon dioxide emissions, human-caused pollution could fuel a 250 percent rise in annual pollen emissions.
Zhang and her team used two sets of data to construct their model. First, they used historical pollen data collected from almost 100 sites across North America to better understand the relationship between pollen emissions and different drivers of climate change, such as temperature and the amount of carbon dioxide in the atmosphere.
But pollen changes will look different depending on where in the U.S. a person lives and the composition of the plants and forests nearby, Zhang said. Northern states are expected to see the biggest changes, something scientists have already documented.
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