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The best thing is to reduce your exposure to formaldehyde. Unfortunately, formaldehyde is everywhere including your home. Almost anything that is glued together such as cabinets, plywood, particle board, press board, MDF doors & moulding, laminate floors, insulation, furniture, closet organizers, flet covered hangers, shoe shelves hung from closet rods, toy boxes, etc.   Testing your home is easy and inexpensive. 10 tests for $99 and you can even double up tests on low level results. Start where you spend the most time and get the symptoms.   Get an air filter that removes formaldehyde and other chemicals. To my knowledge this requires potassium permanganate.   Replace your current house ventilation filter with a filter designed to remove chemicals. Again this will likely require potassium permanganate.   Open your windows as much as possilble. The air inside is about 6-10 times more polluted then the air outside. This is free. If you have pollen issues get a HEPA filter that has potassium permanganate.