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Lawyers will be in U-S District Court in St. Paul today arguing both sides of a proposal by Northshore Mining. That company wants the state to drop a requirement that it meet an air quality standard which Northshore says is no longer relevant.  It's called the "control-city standard," and Minnesota Public Radio's Stephanie Hemphill talked with Morning Edition's Cathy Wurzer to provide some background on the case.

Northshore says the "control-city" standard is no longer relevant. Environmental reporter Stephanie Hemphill explains.

Lawyers will be in U-S District Court in St. Paul today arguing both sides of a proposal by Northshore Mining.  That company wants the state to drop a requirement that it meet an air quality standard which Northshore says is no longer relevant.  It's called the "control-city standard," and Minnesota Public Radio's Stephanie Hemphill talked with Morning Edition's Cathy Wurzer to provide some background on the case.

Northshore Mining wants air quality requirement dropped

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