Regulation & law · 23/12/2011Updated: 10/17/2026 · 1 min read

EPA Approves Ohio and Indiana's Air Quality Plans

The US Environmental Protection Agency (EPA) has approved Ohio's and Indiana's requests to redesignate their portions of the Cincinnati-Hamilton nonattainment area to meet the 1997 annual fine particulate matter standard. This approval allows the states to maintain the standard through 2021.