A European manufacturer of recycled paper for corrugated board, which already has a packaging factory in Hamilton, is exploring building a new paper mill in Dayton that could create more than 200 jobs. However, the city of Dayton does not permit paper or pulp manufacturing operations, and the project likely would need zoning code changes to move forward. Trotwood’s city manager, mayor and leaders with the city’s school district and the Trotwood Chamber of Commerce have already voiced opposition to the proposed project. They say it could produce odors and pollution and hurt the quality of life for residents, businesses and the schools. Saica Group — a Spain-based company — has submitted a zoning code text amendment application that asks the city of Dayton to modify its zoning regulations.