Nearly half of U.S. kids are breathing unhealthy air, report says. These are the cleanest and most polluted cities. - CBS News

1. Nearly half of U.S. kids are breathing unhealthy air, report says. These are the cleanest and most polluted cities.  CBS News
2. In the US, where people breathe increasingly dirty air, one small city stands out  CNN
3. More Americans are exposed to polluted air in the United States. See where.  The Washington Post
4. Nearly half of US children are breathing dangerous levels of air pollution, report warns  The Guardian
5. Earth Day report: Almost half of US population breathes unhealthy air  The Hill