Sulfur Dioxide Designations

Area Designations for the 2010 Primary Sulfur Dioxide National Ambient Air Quality Standard - Round 3 - July 2016

This memorandum provides information on the schedule and process for the area designations for the 2010 primary sulfur dioxide standard that must be completed by December 31, 2017.

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Area Designations for the 2010 Primary Sulfur Dioxide National Ambient Air Quality Standard - Round 3 (PDF)(4 pp, 1 MB)