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The air in hundreds of U.S. counties is simply too dirty to breathe, the government said Wednesday, ordering a multibillion-dollar expansion of efforts to clean up smog in cities and towns nationwide.
The Environmental Protection Agency announced it was tightening the amount of ozone, commonly known as smog, that will be allowed in the air. But the lower standard still falls short of what most health experts say is needed to significantly reduce heart and asthma attacks from breathing smog-clogged air.