Does polystyrene biodegrade in landfills?
No. Nothing really degrades in landfills: not polystyrene, not paper, not even food wastes. A landfill is designed to keep out air, water and light to prevent the degradation process. In fact, the absence of degradation in landfills is a benefit because degradation results in the formation of leachate, which can contaminate groundwater, and of methane gas, a potentially explosive air pollutant.
