Late last year, the EPA reclassified areas of Milwaukee, Kenosha and Sheboygan counties as being in “serious nonattainment” of the agency’s 2015 ozone standards. In 2018, Clean Wisconsin sued the EPA to force the agency to declare the three southeastern Wisconsin counties aren’t complying with federal air quality rules. Ozone pollution, also known as smog, occurs most often in the summer when air pollution from vehicle exhaust and industrial processes reacts with sunlight. DNR analysis has found that less than 10% of the ozone pollution in the state is caused by Wisconsin industry. “It’s unfair to punish Wisconsin businesses for pollution they didn’t create, and [the] order is the first step toward righting this wrong.”