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EPA Completes Fourth Round of Sulfur Dioxide Designations

Posted by [email protected] on Mar. 24, 2021     

On Wednesday (March 10), the Acting Administrator re-signed the December 2020 Round 4 SO2 designations action. EPA has identified or “designated” all remaining portions of the U.S.:

  • “nonattainment” – not meeting the 1-hour health-based national air quality standard for SO2,
  • “unclassifiable” – not enough information to make a determination, or
  • “attainment/unclassifiable” - meeting the standard and not contributing to a violation of the standard.

More details:

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