Households, businesses and institutions across Massachusetts generate nearly 8 million tons of solid waste per year. More than one-third of this material is recycled or composted. The rest is burned in incinerators (known as municipal waste combustors), buried in lined landfills or transported to out-of-state disposal facilities. There are seven solid waste combustion facilities in Massachusetts. These web pages provide an overview of the role they play in our state's waste management system, how they operate and are regulated, and the progress they are making toward reducing their emissions of targeted air pollutants.