4958
The project received approval from state environmental agencies in 1991 , after satisfying concerns including release of toxins by the excavation and the possibility of disrupting the homes of millions of rats , causing them to roam the streets of Boston in search of new housing .
 location: Boston
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Boston