I wouldn't worry if you have no symptoms. I'd advise to regularly monitor biomarkers of your immune system (monthly/quarterly bloodwork with vitamin D etc), take approriate supplements which take into account any genetic metabolism defects (MTHFR), and listen to your body, especially the magic tingling of your nose and any symptoms of seasonal allergy.

Generally a DIY HEPA filter and a CO2 monitor should be enough to keep good air in a home which does not have water damage. If you have ventilation then remember to swap your filters.