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The urgency to return to normal after the devastating terrorist attacks on Sept. 11, 2001, was viewed as a national and patriotic mission, and the air near ground zero was soon thought to be safe. (Associated Press/File)

The urgency to return to normal after the devastating terrorist attacks on Sept. 11, 2001, was viewed as a national and patriotic mission, and the air near ground zero was soon thought to be safe. (Associated Press/File)

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