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Each winter, Delhi slips back into a familiar emergency. A thick blanket of toxic smog settles over the city, visibility reduces, schools shut, flights are disrupted, and hospitals report a surge in ...

CLAIRTON, Pa. (AP) — North America’s largest coke producer has once again agreed to fix longstanding air pollution problems at its plant outside Pittsburgh. U.S. Steel’s Clairton Coke Works has had a ...