A designation of attainment means Ohio has achieved the federal air quality standard at that point in time and has plans in place to help maintain it in the future. The attainment designations reflect decades of work to reduce air pollution, improve air quality, and ensure cleaner air for every Ohioan. “This is a testament to the state, federal, and local partners, who have dedicated themselves to improving air quality. It demonstrates that Ohio can improve environmental quality while continuing to support economic growth. Email newsletter signupUnder the federal Clean Air Act, areas redesignated to attainment must continue meeting air quality standards and maintain those standards for at least 10 years.