The U.S. Environmental Protection Agency (EPA) has proposed reclassifying Greater Cleveland as "attainment" for ozone, a move that could have broad implications across a five-county region. The decision was made after the Ohio EPA determined that air quality measurements in Greater Cleveland were unduly influenced by smoke from Canadian wildfires. This could allow for less reporting requirements by the state and significant savings for local businesses that emit ozone-causing chemicals. The proposed redesignation means plants would have to emit at least 250 million tons of air pollution a year to be considered a major source, compared to the current threshold of 50 tons per year. The public comment period is open until March 30.