Pollen enters on clothing, pets and outdoor air. It settles on floors and furnishings and can also collect in return pathways where it becomes part of household dust.
Reduce the source
Use door mats, vacuum with appropriate filtration, keep windows closed during peak pollen periods when practical and replace loaded HVAC filters. Control indoor humidity to discourage dust mites.
Where duct cleaning fits
If inspection confirms significant settled debris, source-removal duct cleaning can reduce material available to recirculate. It is not medical treatment; discuss persistent symptoms with a qualified healthcare professional.