Nearly half of U.S. kids are breathing unhealthy air, report says. These are the cleanest and most polluted cities.    CBS News In the US, where people breathe increasingly dirty air, one small city stands out    CNN More Americans are exposed to polluted air in the United States. See where.    The Washington Post Nearly half of US children are breathing dangerous levels of air pollution, report warns    The Guardian Indianapolis, Carmel area fails air pollution measures in new report    IndyStar