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EPA sends proposed SO2 NAAQS review for OMB review

May 15, 2018
EPA has sent its proposed review of the existing sulfur dioxide (SO2) national ambient air quality standards (NAAQS) for White House Office of Management & Budget (OMB) review, a rule that is expected to either propose leaving the current standards in place or potentially float a slight softening of the SO2 limit. Under a legal deadline, EPA must propose a new SO2 NAAQS rule by May 25, and sign a final rule by Jan. 28. EPA sent the rule for...

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