Study: US oil field source of global uptick in air pollution

In this Feb. 25, 2015 photo, a drilling rig is seen near Epping, N.D. A team led by researchers at the University of Michigan has found that fossil fuel production at the Bakken Formation in North Dakota and Montana is emitting roughly 2 percent of the ethane detected in the Earth's atmosphere. Along with its chemical cousin methane, ethane is a hydrocarbon that is a significant component of natural gas. Once in the atmosphere, ethane reacts with sunlight to form ozone.(AP Photo/Matthew Brown)WASHINGTON (AP) — An oil and natural gas field in the western United States is largely responsible for a global uptick of the air pollutant ethane, according to a new study.

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