National Geographic: It may be the biggest success story in environmental health in modern America.
Children in the Los Angeles region have substantially healthier lungs than they did just 20 years ago, thanks largely to multibillion-dollar efforts to clean up southern California's infamous smog and soot.
In landmark research published Wednesday, University of Southern California scientists found that kids in the region are breathing better than they did in 1994, and the percentage of kids with abnormally poor...