If you want to minimize allergens preventively, then you should check and clean your furnace filter often. If you have a home with forced-air system, installing a particle-catching furnace filter will reduce your exposure to a range of triggers like dust, pollen and mold. Get one with a residential MERV rating of 12. MERV ratings indicate how effective a filter is at catching allergens. The highest rating is 12.

Change the filter every three months. Leave the system's fan on to keep clean air circulating.