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Longer growing season means more pollen — and more misery

Climate Central's new analysis shows warmer temperatures are lengthening and intensifying U.S. pollen seasons, while millions of Americans are already experiencing seasonal allergy symptoms this spring.
Analysis of 198 U.S. cities shows the freeze-free growing season has stretched about three weeks longer than in the 1970s, Winkley explained.
Regional pollen calendars show evergreen pollen peaks in May and lingers in the northwest, grasses spread pollen through spring and summer, deciduous trees pollinate in spring, ragweed peaks in September and October, and cedar/juniper cause winter allergies in the south.
Health guidance recommends parents monitor pollen forecasts, limit outdoor exposure on high-pollen days, keep windows closed, use HEPA filters, and support carbon pollution cuts to protect U.S. children with allergies and asthma.
Researchers warn that heat-trapping pollution will boost pollen and a 2022 study projects a 200% increase by century's end; Climate Central meteorologist Shel Winkley said, `Warming temperatures are helping make allergy season start earlier, last longer and really just feel worse.

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