ROSEBUSH, Mich. (AP) — An appeals court has overturned a decision by federal regulators in a pollution case that involves natural gas production in central Michigan.

The Environmental Protection Agency had considered Summit Petroleum in Isabella County and its wells and pipes as a single source, even if some wells are miles away. The distinction is important for the purpose of regulating significant air pollution.

But a federal appeals court said Tuesday that the EPA is wrong. In a 2-1 decision, the court says the properties near Mount Pleasant are not "adjacent' under the definition of that word.

Emissions from just one well and the production site in Rosebush would exceed more than 100 tons of sulfur dioxide a year. There was no immediate comment from Summit Petroleum or the government.