Shut: "Hay fever" generally applies to environmental pollen sensitivity, so I recommend shutting the windows. However, indoor allergens are more problematic this time of year (unless trees have begun to pollenate in n. CA), so opening/shutting the window may have little effect. Skin testing for allergen sensitivity can help refine successful avoidance strategies and guide therapy. See an Allergist.
Answered 3/9/2015
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