EPA has determined that the tri-state Cincinnati-Hamilton, Ohio-Kentucky-Indiana, fine particulate (PM2.5) nonattainment Area has attained the 1997 annual average PM2.5 national ambient air quality standards (NAAQS) and additionally, that the Area has attained the 1997 annual PM2.5 NAAQS by its applicable attainment date of April 5, 2010.
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Comments for Approval and Promulgation of Air Quality Implementation Plans: Ohio, Kentucky, and Indiana