WASHINGTON (AP) — In a major anti-pollution ruling, the Supreme Court on Tuesday backed federally imposed limits on smokestack emissions that cross state lines and burden downwind areas with bad air from power plants they can’t control.

The 6-2 ruling was an important victory for the Obama administration in controlling emissions from power plants in 27 Midwestern and Appalachian states that contribute to soot and smog along the East Coast.

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