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89 FR 26817

SIP Proposal: California (revisions to meet requirements for the 1997 eight-hour ozone NAAQS in the Riverside County nonattainment area). 

89 FR 26813

SIP Proposal: Arizona (revisions concerning emissions of volatile organic compounds, nitrogen oxides, particulate matter, and sulfur oxides for the Maricopa County Air Quality Department).  

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).