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Policy and Guidance

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EPA Issues Guidance for Designating Areas for the Sulfur Dioxide Primary National Air Quality Standard
March 24, 2011 - The Environmental Protection Agency issued guidance on the schedule and process for designating areas for the 2010 revised primary sulfur dioxide (SO₂) NAAQS. The document also includes guidance on conducting air quality modeling to inform SO₂ designation decisions.

• Guidance Memorandum (PDF) (42pp, 12.0 MB) - Updated April 11, 2011

 

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