89 FR 50227
SIP Approval: North Carolina (updates to 2026 on-road and nonroad emissions inventories, safety margins, and motor vehicle emissions budgets).
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89 FR 49120
SIP Proposal: Michigan (removal of redundant definition for "used oil").
89 FR 49874
EPA designated one new equivalent method for measuring concentrations of ozone in ambient air.
89 FR 49815
SIP Approval: California (revisions to meet extreme area requirements for the 1997 eight-hour ozone NAAQS in the Riverside Co. nonattainment area).
89 FR 49100
SIP Approval: Michigan (removal of redundant definition for "used oil").
89 FR 48523
SIP Proposal: Pennsylvania (revisions to attainment plan for the Indiana, Pennsylvania 2010 one-hour sulfur dioxide nonattainment area).