(CNN) — For roughly 1 in 4 American adults, spring blooms mark the start of itchy, eye-watering, congested misery. And looked at any number of ways, it’s only getting worse: Experts agree that more people are becoming allergic to airborne irritants like pollen and mold, allergy symptoms aremore severe, and allergy seasons are lasting longer than ever. You may also feel the increasing pollen burden even if you don’t have hay fever, as studies sho…