Inhalable particles range in size. They may be biological or organic such as pet dander, pollen, mold, or skin flakes. They may be inorganic such as carpet fibers, fuel combustion by-products, tobacco smoke, or wood. Particulate exposure may trigger an allergic reaction or asthma attack. A whole-house filter could lower particulate levels if it's properly maintained. A stand-alone air purifier with filter could help in small areas of your home. Be sure to regularly change the filter. An electrostatic or ionizing purifier is not recommended because they create ozone, a powerful lung irritant.

Volatile organic compounds, or VOC's, are chemicals from sources such as household cleaners, indoor chemicals, paints, and solvents, Limit your exposure and properly use these chemicals. Compounds in VOC's usually have an odor, making them easy to detect. Formaldehyde is a common VOC that's often used as a preservative. Formaldehyde may be found in carpeting, furniture, paneling, or particle board. Did you know it can take up to two years for formaldehyde to off gas? Exposure to volatile organic compounds may cause an allergic reaction or damage to the central nervous system and kidneys. They have also been linked to cancer.