"Essentially, with warmer temperatures and increased carbon dioxide levels, we see more pollen being produced from ragweed [a common fall allergen] and we're seeing the first fall freeze being delayed, which is when mold spores [another common fall allergen found on decomposing leaves] are typically killed off," says Keswani.
"Last year's ragweed season lasted much longer and the pollen count seemed to be higher than in previous years, and I think we're seeing a similar trend this year. Although, of course, it's not the end of the season yet."
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