Rain can be both good and bad for allergies, depending on the timing and circumstances. Initially, rain can alleviate allergy symptoms, but this relief might be temporary.
How Rain Can Help Allergies
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Washing Away Pollen: Rain can wash pollen out of the air, providing temporary relief for allergy sufferers. The immediate effect of a downpour can significantly reduce airborne pollen counts.
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Preventing Pollen Travel: Rain can prevent pollen from traveling long distances, limiting exposure for those sensitive to it.
How Rain Can Worsen Allergies
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Increased Pollen Counts After Rain: The American College of Allergy, Asthma & Immunology states that pollen counts can rapidly increase after rainfall, potentially exacerbating allergy symptoms.
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Mold Growth: Damp conditions caused by rain promote the growth of mold, a common allergen. Increased humidity supports mold spore release, which can trigger allergic reactions.
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Pollen Burst: Thunderstorms can break pollen grains into smaller, more allergenic particles that are easily inhaled, leading to what is sometimes called "thunderstorm asthma."
Summary
While rain may initially provide relief by washing away pollen, it can also create conditions that worsen allergies due to increased mold growth, higher pollen counts after the rain, and the potential for thunderstorm-related pollen bursts. Therefore, the effect of rain on allergies is complex and can vary.
