Many substances can trigger the itching, sneezing and congestion of allergic rhinitis. The common allergens are pollen, mold spores, animal dander , and house dust . Pollen consists of tiny particles that are carried by the wind from plants and trees. Molds are found both indoors and outdoors and grow best in warm, humid places. Animal dander consists of tiny flakes of skin shed by animals.
House pets are usually the source.
House dust is a combination of many irritants including dust mites and fabric fibers. A person susceptible to sinus disorders, particularly one who is also allergic or has asthma, should avoid cigarette smoke and other air pollutants. Trade off with roommates on dusting chores. Clean Venetian blinds, mini-blinds with damp cloth also. Cigarette smoke decreases your immune response and you cannot fight off infection or allergic reactions well.