What environmental modifications improve pediatric asthma?

Abstract

Reducing environmental tobacco smoke exposure decreases health care utilization among poor asthmatic children. Dust mite reduction by chemical measures is potentially harmful. (Grade of recommendations: B, based on single randomized controlled trial.) Evidence is insufficient for or against dust mite reduction by physical means, use of synthetic or feather bedding, removal of cats, use of air filters or reducing indoor humidity. (Grade of recommendations: D, inconsistent studies.)