The American Lung Association says these factors trigger asthma and allergy symptoms in many people:

• Anything with powerful fumes, such as hair spray, paint or perfume.
• Cold air.
• Smoke from cigarettes, pipes, cigars or fireplaces.
• Pollen, mold or dust mites.
• Animal dander.
• Air pollution.
• Respiratory tract infections or reactions, stemming from sources such as the common cold or flu.