Clean out contaminates Clean up mold ; use nontoxic cleaners; use low- or no-VOC paint, caulk, and adhesives; and store solvents in the garage. Hire a reputable dust-cleaning company to clean furnace ducts every year or two, especially after a renovation. You’ll amazed when they show you the before-and-after shots of your ducts. (make sure the company uses a camera scope to check the ductwork). Ventilate Properly You need a sufficient air-exchange rate in your home to help extract chemicals and control humidity. Open windows or install the best exhaust fans on the market for your bathroom and kitchen (make sure you get the right size for your stove). Filter the air Your furnace filter traps airborne particles so you don’t breathe them in. Change your furnace filter often; I’d do it once every month or two. I also recommend having an HVAC specialist install an air cleaner with a HEPA (high-efficiency particulate air) filter to remove biological and airborne contaminants.