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    Federal
Clean Air Status and Trends Network (CASTNET) Download Data Module
U.S. Environmental Protection Agency —
The CASTNET Download Data module allows users to select, view, and download CASTNET data (Raw, Aggregate, Modeled & Factual Data) based on user selections.... - 
  
    Federal
Clean Air Status and Trends Network (CASTNET): Ozone
U.S. Environmental Protection Agency —
8-hour daily maximum ozone concentrations as measured by the Clean Air Status and Trends Network (CASTNET) - 
  
    Federal
Report on U.S. Methane Emissions 1990-2020: Inventories, Projections, and Opportunities for Reductions: 2001 Updated emission and cost estimates
U.S. Environmental Protection Agency —
This dataset contains relative and absolute forecasts of emissions through 2020 for landfills, natural gas and oil systems, coal mines, manure management and enteric... - 
  
    Federal
Clean Air Markets Program Data Application (CAMPD)
U.S. Environmental Protection Agency —
The Clean Air Markets Program Data (CAMPD) application, accessible at https://campd.epa.gov/, allows users to view Clean Air Markets data through the Custom Data...