"WASHINGTON - The U.S. Environmental Protection Agency said on Thursday it was withdrawing a provision of the Clean Air Act that requires a major source of pollution like a power plant to always be treated as a major source, even if it makes changes to reduce emissions.

The decision to withdraw the “once-in always-in” policy is part of President Donald Trump’s effort to roll back federal regulations and was sought by utilities, the petroleum industry and others.

Sources of air pollution previously classified as “major sources” may be reclassified as “area” sources when the facility limits its emissions below “major source” thresholds, the EPA said. Area sources are subject to less strict pollution control standards than major sources."

Eric Beech reports for Reuters January 25, 2018. [2]