Seasonal allergies are getting worse each year. any ideas why?

Plants bloom: This when many plants "bloom" meaning they release pollen into the air.These airborne particles may cause allergic signs and symptoms.

ADDED NEW Allergies: Over time your 'overactive' immune system may be adding several allergies to your list of sensitivities. Studies show that when >2 allergens are present in your environment at once you will be symptomatic (exhibiting many symptoms). Since many allergens have a season you may become symptomatic longer when new allergens are added. When multiple allergens are present your symptoms may worsen.