This 13 year Children’s Health Study assessed “whether long-term reductions in pollution [in southern California] were associated with improvements in respiratory health among children.”
Researchers “found that the long-term improvements in air quality were associated with statistically and clinically significant positive effects on long-function growth in children.” The New England Journal of Medicine. Read it and watch the video on DelhiAir.org
Association of Improved Air Quality with Lung Development in Children