One study found since 1990, North American pollen seasons are 20 days longer.
High pollen levels can lead to a variety of symptoms including sneezing, runny nose, itchy and watery eyes, hives and coughing -- and Americans may have to deal with them for much longer than in past years.found that between 1990 and 2018, North American pollen seasons became 20 days longer on average with pollen concentrations increasing up to 21% during the same period.
Reactions can range from mildly annoying symptoms to life-threatening reactions including anaphylactic shock, which occurs when blood pressure drops suddenly and the organs can't get enough oxygen. Anderegg, a lead author on the 2020 study, explained that warmer temperatures drive more pollen from plants and higher pollen levels will mean more intense allergies and asthma.
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