The main reasons for this are as follows:
Causes of allergic sneezing
Dust mites: A reaction to microorganisms found in house dust, old books, curtains, and mattresses.
https://youtu.be/OeobWvtQoGE
Pollen: Pollen from plants, trees, and flowers enters the nose through the air (seasonal allergies).
Pets: Pet hair, saliva, or skin flakes reach the nose through the air.
Mold: Mold that grows in damp areas or on decaying objects in the house.
Air pollution: Smoke, perfume odors, strong chemical odors, and exhaust fumes from vehicles can trigger sneezing in people with allergies.
https://youtu.be/OeobWvtQoGE
Weather changes: Sudden cold or excessive humidity in the air can trigger allergic sneezing in many people.