NBC Evening News for Thursday, Nov 20, 1975
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(Studio) Emergency declared in Pittsburgh, Pennsylvania, after layer of warm air trapped by layer of cold air.
REPORTER: John Chancellor
(Pittsburgh, Pennsylvania) Pollution alert lifted today after air clears. Smog filled city during inversion. 30 industry plants ordered to cut back, incling. USS Steel's Clairton Works, largest United States coking plant. 1500-2000 workers laid off; called back today.
REPORTER: Scott Osborne (WIIC-TV)
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