Environmental allergies.
Your home, school or workplace may contain substances that can cause an allergic reaction. These environmental substances include:
dust,
dust mites,
mold spores, and
mildew.These substances can cause allergy problems all year round.
While avoidance is the best solution in most cases, some causes of symptoms, such as molds and dust mites, cannot be eliminated. Exposure can be reduced, however, by environmental control measures prescribed by your allergist.

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