89 FR 26817
SIP Proposal: California (revisions to meet requirements for the 1997 eight-hour ozone NAAQS in the Riverside County nonattainment area).
SIP Proposal: California (revisions to meet requirements for the 1997 eight-hour ozone NAAQS in the Riverside County nonattainment area).
SIP Proposal: Arizona (revisions concerning emissions of volatile organic compounds, nitrogen oxides, particulate matter, and sulfur oxides for the Maricopa County Air Quality Department).
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.
SIP Proposal: Ohio (particulate matter rules).