Water vapor as "pollution"?: Sierra Club's claims are based on opacity, which measures the thickness of emissions from a smoke stack by how much light passes through it

Sierra Club plans to sue Minnesota Power over pollutants at coal plants 

"The Sierra Club’s claims are based on opacity, which measures the thickness of emissions from a smoke stack by how much light passes through it, the AP says. Minnesota Power disputes the contentions in the Sierra Club’s intent-to-sue notice. Officials with the utility tell the AP opacity can be caused by factors other than pollutants, citing water vapor as an example."

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