Landfill output refers to the waste materials that are produced by landfills. This includes both solid and liquid waste, as well as ODORS. The two crossword solutions for the term 'landfill output' are 'ODORS' (5 letters) and 'ODOR' (4 letters). ODORS are a common byproduct of landfills due to the decomposition of organic matter. These ODORS can be unpleasant and can travel long distances, making them a nuisance to nearby communities.