In one study, however, removing cat allergens from the air had no effect on asthma symptoms. It is best to avoid carpets if possible. Bedding and Curtains. Using semipermeable coverings to fully encase mattresses and pillows is the most proven effective step in reducing dust mite levels. Curtains should be replaced with shades or blinds and bedding washed using the highest temperature setting.
Damp housing increases the risk for asthma.
Electric stoves should replace gas ovens, which release nitrogen dioxide. Cockroaches should be eliminated by professional exterminators. Patients should avoid high activity when ozone levels are high, which usually occur in early afternoon, particularly on hot hazy summer days. Levels are lowest in early afternoon and dusk. Patients who are allergic to mold should avoid barns, hay, raking leaves, and mowing grass.