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Emissions Inventory and Analysis

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Emission inventories are compilations of estimated emissions from various sources. Estimates are typically calculated using data on source activity and historical emission rates per pollutant. Emission inventories are combined with meteorological and other technical data using computer models to forecast pollutant levels in future years. Numerous agencies and organizations throughout the region partner with the District to develop SIPs that include emission inventories, modeling, and related analyses.

National Emissions Inventory (NEI)

The NEI is required under the Air Emissions Reporting Rule (AERR) 40 CFR 51 and the District submits inventories of our approximately 45 Title V point sources annually and the entirety of our inventory every three years to US EPA. To examine summaries of our triennial you can read our Air Quality Data Trends Report or download the summaries.

Other Inventories
The District also completes other emissions inventories required under the Clean Air Act or other federal requirements such as:

  • Base Year SIP Emissions Inventory
  • Rate of Progress Inventory
  • Photochemical Modeling Inventory
  • Maintenance Plan Inventory
  • Toxic Release Inventory
  • Greenhouse Gas Inventory



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