| http://www.w3.org/ns/prov#value | - In all, the EPA issued five news releases within 10 days of the attacks and four more by the end of 2001 reassuring the public about air quality. [Soon,] respiratory ailments and other problems began to surface in hundreds of workers cleaning dusty offices and apartments. [Scientists had measured the pH of the dust at about 12, which is roughly equivalent to liquid Drano.
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