Mamdani Unseals Documents Related to 9/11 Toxic Air

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The attacks of Sept. 11 have been a rolling tragedy in the quarter-century since the towers fell, with thousands more people dying from the air they breathed in and around the toxic pile at ground zero. As the country prepared to mark the 25thanniversary, New York Mayor Zohran Mamdani released a trove of previously undisclosed government documents showing just how deadly the air was. NBC’s Valerie Castro reports in this week’s Sunday Focus.

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