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Memorandum <br />25 March 2025 <br />Page 5 <br />• Endangerment Finding: The current and projected concentrations of the six key well- <br />mixed GHGs (CO2, CH4, N2O, hydrofluorocarbons, perfluorocarbons, and sulfur <br />Hexafluoride) in the atmosphere threaten the public health and welfare of current and <br />future generations. The EPA also found that the combined emissions of these GHGs <br />from new motor vehicles and new motor vehicle engines contribute to the GHG <br />pollution that endangers public health and welfare under Clean Air Act Section 202(a). <br />• Cause or Contribute Finding: The combined emissions of these well-mixed GHGs from <br />new motor vehicles and new motor vehicle engines contribute to the GHG pollution that <br />threatens public health and welfare. <br />In 2016, the EPA established two regulations—the New Source Performance Standards (NSPS) <br />for new landfills and the Emission Guidelines (EG) for existing landfills—aimed at reducing <br />methane emissions from landfill gas. The EG require the installation of a LFG collection and <br />control system at municipal solid waste (MSW) landfills that exceed a specified design capacity <br />and NMOC emission threshold. <br />State Regulations <br />The State of California has established the following long-term climate action goals: <br />• Assembly Bill (AB) 32: Reduce GHG emissions to 1990 levels by 2020. <br />• Senate Bill (SB) 32: Reduce GHG emissions to 40 percent below 1990 levels by 2030. <br />• AB 1279: Achieve carbon neutrality as soon as possible, but no later than 2045 and <br />maintain net negative GHG emissions thereafter; and reduce GHG emissions to 85 <br />percent below 1990 levels by 2045. <br />Landfill Methane Regulation <br />In response to California Assembly Bill 32, the California Air Resources Board (CARB) adopted <br />the Landfill Methane Regulation in 2010, which requires MSW landfills to reduce methane and <br />other air pollutant emissions through emissions monitoring and capturing fugitive methane <br />emissions. MSW landfills are regulated under local air district rules that implement the federal <br />requirements of the NSPS and EG, 40 Code of Federal Regulations Part 60 Subparts WWW and <br />Cc, for MSW landfills. CARB and 22 air districts, including the San Joaquin Valley Air Pollution <br />Control District (Valley Air District), entered into memoranda of understanding to enable the <br />districts to implement and enforce the Landfill Methane Regulation.