Think about buying a portable air cleaner with a HEPA filter, which catches and eliminates microscopic particles from the air, such as pollen, smoke, bacteria, mildew, and dust. Prices for air cleaners vary greatly, however some machines under $100 may successfully clean a room.
Also, use whatever mechanical ventilation you have in your home: when cooking, run an exhaust fan over the range, and when having a shower, turn on the bathroom exhaust fan. Check to see if your vent truly vents to the outside: many do not, and instead recirculate the stale air within. If this is the case, fresh air may be beneficial.
Other things to take to minimize introducing pollutants into your house can include taking your shoes off inside, cleaning and mopping more regularly, and avoiding lighting scented candles indoors. Use candles made of 100 percent natural materials like beeswax. You should also avoid utilizing scented goods, such as air fresheners, to mask odors.