EPA issued two enforcement alerts addressing regulatory requirements and associated compliance issues at municipal solid waste landfills (MSW landfills). The alerts address Clean Air Act requirements that control the release of landfill gases (LFG), particularly methane, a climate super pollutant from MSW landfills. The alerts provide an overview of the Clean Air Act regulatory requirements related to landfill air emissions and are intended to help address the climate crisis and ensure that landfill owners, operators, and contractors comply with the law and take the necessary steps to avoid potential EPA enforcement actions.