Particles the size of allergens and pollen
Pollen is commonly carried into homes on skin, hair, clothes, footwear and pets. Once inside, pollen grains and antigens accumulate in house dust, reaching a peak concentration long after pollination season.
With their microscopic size and jagged shape, pet allergens can easily stick to upholstered furniture, bedding and fabrics – and often stay in the home for months as house dust, even after the pet is gone.