It’s officially spring, which for some people brings on allergies, triggered by pollen from trees and grasses, which can cause sneezing, a runny nose and itchy eyes. Changes in temperature can cause pollination to start and stop, leading to higher concentrations of allergens in the air. On dry, windy days when pollen counts are high, it is advised sufferers should stay indoors and use air conditioning instead of opening windows to keep pollen out of your house.

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