Under pressure, U.S. EPA seeks tighter ozone standards

By Valerie Volcovici WASHINGTON (Reuters) – The U.S. Environmental Protection Agency is proposing more stringent air quality standards for ground-level ozone, the main culprit in smog, the agency’s chief said on Wednesday. Under deadline to release its proposal by Monday, the agency said it will seek a National Ambient Air Quality Standard between 65 and 70 parts per billion concentration of ozone, and take comment on standards within a 60-75 ppb range, EPA administrator Gina McCarthy said. Current standards, set under then-President George W. Bush in 2008, are set at 75 ppb. …
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