One helpful tool to reduce allergies is to avoid exposure in the first place. In avoiding the great outdoors by staying inside, in “air conditioned” air addition of filters can greatly reduce allergen particles by trapping them before they enter or as they blow through your air system. These types of furnace filters for forced air systems – furnaces/air conditioners combos, are available at most hardware stores. But sometimes you not able to add a filter to the system heating and cooling in your space or may need more filtering if the duct have allot of dust build up. Then individual air duct filters can be helpful and addition house air filter can remove more particles, especially electrostatic filters trap more dust, molds, pollen and mites.

Here is a link to choose custom filters of all types with information on when and how to use them.https://www.permatron.com/register-vent-filters.

Another helpful website if you or your pet suffers from airborne allergies to mold, pollen, house dust or the HD mite is https://www.allergybegone.com/airfiltration.html.