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Nov 26, 2014
Nov 26, 2014

U.S. EPA expected to tighten long-awaited ozone standards: sources

WASHINGTON (Reuters) – The Environmental Protection Agency is expected to propose on Wednesday more stringent air quality standards for ground-level ozone, the main culprit in smog, sources said.

Under a court-ordered deadline of next Monday to release its proposal, the agency could propose 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, sources familiar with the matter said.

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