SOURCE: Journal of the American Medical Association
Better Air Quality Decreases Respiratory Symptoms in Children
Researchers from the University of Southern California followed over 4,600 children in eight Southern California communities across three different time periods from 1993-2012. In addition to monitoring air quality, they also looked at children with and without asthma, and whether they reported respiratory symptoms like bronchitis, congestion, phlegm production, or a daily cough for three months in a row, during the previous year.
Along with significant improvements in air pollution levels, the authors found a decrease in reported respiratory symptoms in children both with and without asthma. Respiratory symptoms decreased by 32 percent in children with asthma and 21 percent in children without.