From an Associated Press article:
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. EPA Administrator Stephen Johnson called the new limits "the most stringent standards ever," and he said they will require 345 counties — out of more than 700 that are monitored — to make air quality improvements because they now have dirtier air than is healthy to breathe. Johnson said that state and local officials have considerable time to meet the requirements — as much as 20 years for some that have the most serious pollution problems. EPA estimates that by 2020 the number of counties failing to meet the new health standard will drop to about 28. About 85 counties still fall short of the old standard enacted a decade ago. "Hundreds of counties haven't been able to meet the current standard set a decade ago," said John Kinsman, senior director for environment at the Edison Electric Institute, which represents most of the country's power companies. "Moving the goalpost again will inflict economic hardship on those areas without speeding air quality improvements." The EPA has said, based on various studies, cutting smog from 80 to 75 parts per billion would prevent between 900 and 1,100 premature deaths a year and mean 1,400 fewer nonfatal heart attacks and 5,600 fewer hospital or emergency room visits. A separate study suggests that tightening the standard to 70 parts per billion could avoid as many s 3,800 premature deaths nationwide. | 
