EPA Pauses Air Modeling Rule Amid Uncertainty Over Secondary NAAQS

January 27, 2025
EPA is extending the effective date of its November “guideline” that provides states with new methods for modeling air quality, moving the date from Jan. 28 to March 21 in response to President Donald Trump’s regulatory “freeze order” amid doubts over the status of EPA’s revised “secondary” air standards rule that may also be subject to a similar pause. In a notice scheduled for publication in the Jan. 28 Federal Register , EPA announces the extension in the effective date...


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