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AirData
The AirData Web site gives you access to air pollution data for the entire United States. AirData presents annual summaries of air pollution data from two EPA databases: AQS (Air Quality System) and NEI (National Emissions Inventory).
eGRID
eGRID is a comprehensive source of data on the environmental characteristics of almost all electric power generated in the United States. eGRID, or Emissions & Generation Resource Integrated Database, contains emissions and resource mix data for virtually every power plant and company that generates electricity in the United States.
Energy Information Administration
Environment Energy-related emissions data & environmental analyses.
National Air Pollution Emissions Trends
Report provides information about emissions of sulfur dioxide (SO2) and nitrogen oxides (NOX) from all sources.
National Atmospheric Deposition Program
Access data from the national network of precipitation monitoring site.
National Emissions Inventory
EPA's National Emission Inventory (NEI) database contains information about sources that emit criteria air pollutants and their precursors, and hazardous air pollutants. The database includes estimates of annual air pollutant emissions from point, nonpoint, and mobile sources in the 50 States, the District of Columbia, Puerto Rico, and the Virgin Islands.
US Greenhouse Gas Inventory
EPA prepares a national inventory of United States greenhouse gas emissions each year for submission under the United Nations Framework Convention on Climate Change.
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Clean Air Markets 
