1. Keep your windows closed and use air conditioning if you’re allergic to pollen. Don’t use fans as they can stir up dust. When you’re driving, set the air condition (AC) to recirculate air.

2. Filter the air, clean air conditionings vents regularly, and use a high-efficiency particulate air (HEPA) filter if you have a forced-air furnace. Clean air filters frequently and air ducts at least once a year.

3. Install dehumidifiers to battle mold, which can collect in basements and other areas of the house. Be sure to clean these air-drying devices every week. Air out damp clothes and shoes (in the house) before storing.

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