Landfill airspace is the volume of space on a landfill site permitted for disposal of municipal solid waste. Airspace utilization is measured and reported in a number of different ways, which contributes to inefficient management of community resources. This report answers the following questions:

• What is considered an acceptable airspace utilization factor?
• Does the generally accepted definition of landfill airspace utilization produce consistent reports in landfills of similar size?
• What effect does compaction equipment, pre-processing, and cover material have on airspace utilization?
• What works—and does not work—in trying to minimize landfill airspace utilization?