This data layer identifies Methane Areas of Concern in the Minnesota Pollution Control Agency's (MPCA) Closed Landfill Program. It was developed by the MPCA. The Closed Landfill Program works to properly close, monitor, and maintain Minnesota's closed municipal sanitary landfills. The Methane Area of Concern is the area surrounding the landfill in which the presence of methane gas may impact or preclude activities. This threat of methane contamination can remain long after landfills are closed. Any activities in the vicinity of a closed landfill need to account for this risk.