Analyze

The article contains quotations attributed directly to the judge, so I would presume she was either present for the ruling or accessed the case brief. This would also be where Ms. Preston could obtain direct quotations from the plantiff's arguments. Additionally, the article includes statements from the EPA, public officials, and Senator Rodham Clinton; these would either be from official public releases or interviews by government personel. 

No references are provided so it is unknown how the author obtained their information. They reference "EPA estimates" of how much pollutants were kicked up into the air after the collapse of the towers but no official reference is provided. Quotes are also provided from various government and EPA officials.