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Why pollen makes you sneeze

When it comes time to mate, trees, weeds, and grasses release thousands of pollen grains into the air — which can end up invading your nose, eyes, and lungs. If you're allergic, your immune system mistakes these harmless grains for a serious threat and releases histamine. That irritates your nose, causing you to sneeze the grains out, and produce mucus to flush them out.
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