The New Orleans City Council expressed unanimous opposition Thursday to the planned Formosa Plastics plant in St. James Parish, raising concerns about how the $9.4 billion complex would affect the health and environment of nearby residents and those of the council’s constituents 65 miles downriver.

Louisiana and St. James officials have approved the company’s plans to build the plant at Welcome, on the west bank near the Sunshine Bridge. The New Orleans resolution won’t prevent its construction, but council members said they felt compelled to weigh in on the issue.