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The United States (U.S.) Environmental Protection Agency (EPA) has established voluntary programs to reduce methane (CH₄) emissions, and regulations that either directly reduce CH₄ or provide co-benefits of reducing CH₄ emissions while controlling for other air pollutants. These programs and regulations address four sectors that are among the largest domestic CH₄ emissions sources: municipal solid waste landfills, oil and natural gas, coal mining, and agricultural manure management. Over the 1993–2013 time period, 127.9 Tg of CH₄ emissions reductions were attributed to these programs, equal to about 18% of the counterfactual (or potential) domestic emissions over that time, with almost 70% of the abatement due to landfill sector regulations. Reductions attributed to the voluntary programs increased nearly continuously during the study period. We quantified how these reductions influenced atmospheric …