| http://www.w3.org/ns/prov#value | - The New York Times, Sept. 18, page F2Dust is a Problem, but the Risk Seems Smallby Andrew C. RevkinAgency officials and independent experts tried to quell rumors about other hazards, including the possibility that the fires might have turned freon from air-conditioners into a poisonous gas called phosgene.The chemical reaction that generates phosgene is possible in extremely hot flames, but no
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