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Pollen Count in Washington, DC: A 2026 Guide to Seasonal Allergy Management

"Managing seasonal allergies in Washington, DC requires a strategic approach to monitoring daily pollen counts and understanding the local botanical calendar. During the 2026 spring and autumn peaks, residents often experience elevated concentrations of tree, grass, and weed pollens, which are exacerbated by the district’s unique urban heat island effect and regional vegetation patterns. Understanding the Regional Pollen Ecosystem Washington, DC operates within a temperate climate zone that supports a diverse range of plant life. The "pollen count" is a measurement of the number of grains of pollen in a cubic meter of air over a 24-hour period..."

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