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89 FR 26620
EPA proposed to revise the existing secondary sulfur dioxide NAAQS, to retain the existing secondary standards for nitrogen oxides and particulate matter, and to revise the data handling requirements for the proposed secondary sulfur oxide NAAQS.
89 FR 26115
SIP Proposal: Ohio (particulate matter rules).
89 FR 25810
SIP Approval: Virginia (second maintenance plan for the 1997 eight-hour ozone NAAQS in the Fredericksburg area).
89 FR 25841
SIP Proposal: New Jersey (partial approval and partial disapproval of revisions to 2015 ozone infrastructure requirements).