Report: 160 Million Americans Breathe Unhealthy Air

The American Lung Association says more than 160 million people in the United States live in areas with unhealthy levels of air pollution. In a new report released Wednesday, the health group cited overall progress in reducing pollution through increased use of cleaner power plants and automobiles, but said short-term spikes in pollution -- many linked to drought and wildfires -- have gotten worse.  It warned that global warming is likely to make those triggers happen more...

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