Reuters: The Obama administration on Thursday trimmed the amount of ozone allowed in the air, issuing a regulation to fight smog that will prevent hundreds of thousands of asthma attacks but cost businesses and utilities billions of dollars.
The Environmental Protection Agency set a new standard of 70 parts per billion (ppb) for the amount of ground-level ozone allowed, from the current level of 75 ppb set under former President George W. Bush in 2008.
Ground-level ozone is a main component of smog....