Dust is a common allergen . House dust contains mites
(which are the primary cause of dust-related
allergies ), microscopic particles of
animal dander ,
pollen , mould , fibers from clothing and other fabrics and
Dust mites, the primary cause of dust allergy, are microscopic organisms found in homes.
It is actually the excrement of these mites to which people are allergic,
thus dust mites can cause allergic reactions even when dead.