Allergens can basically be divided into three different categories. Inhalants such as dust, dust mites, pollens, animal dander, and mould spores. Contactants such as chemical, metals and pants. Ingestants such as drugs, foods, additives.
To keep your home as free from dust as possible.you can maintain a clutter free anvironment in order to reduce breeding grounds for mites, use a damp duster to avoid scattering dust, only use curtains that are easy to wash regularly, choose furniture with few dust catching grooves, keep books in glass fronted bookcases where possible. If you have to store them on open shelves, wipe them down often with a damp cloth.
Vacuum often with an approved vacuum cleaner. If you are the sufferer, wear a mouth and nose mask or cover your mouth and nose with a damp cloth...