CEIDARS

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What is CEIDARS

The California Emissions Inventory Data Analysis and Reporting System (CEIDARS) is the database used by the California Air Resources Board (CARB) to store and maintain criteria and toxic pollutant emissions statewide.

This data management system serves as the foundation for the state's air quality planning efforts.

How CEIDARS works

CEIDARS integrates emissions data from multiple sources, which is then utilized for various air quality planning purposes. The system:

  • Collects data from local air districts, state agencies, and other sources
  • Validates data through quality assurance procedures
    • Automated and manual validation checks
    • Cross-referencing with other data sources
    • Historical trend analysis
  • Stores emissions inventories for current and historical years
  • Serves the following purposes:
    • Fulfills reporting requirements for state and federal programs
    • Supplies emission data for public-facing tools (e.g. facility search tool)
    • Internal and external data requests
    • Air quality planning
      • CEPAM
        • Supplies emission data to the CEPAM model, which is used for regulatory planning and modeling
      • State Implementation Plans (SIP)
        • Supplies emissions data for demonstrating compliance with federal air quality standards
      • Health Risk Assessment
        • Supplies emission data to evaluate potential health impacts of air pollution
      • Regulation and Progress Tracking
        • Evaluates effectiveness of control measures and provides information for development of new measures

What information does CEIDARS maintain

  • Criteria pollutant emissions
    • Particulate Matter (PM)
    • Carbon Monoxide (CO)
    • Sulfur Oxides (SOx)
    • Lead (Pb)
    • Nitrogen Oxides (NOx)
      • Ozone precursor
    • Reactive Organic Gases (ROGs)
      • Ozone precursor
  • Toxic pollutant emissions
  • Temporal profiles
    • How emissions vary by season, day of week, and hour of day
  •  Spatial allocation
    • Where emissions occur across the state
  • For stationary point sources, CEIDARS maintains the following:
    • Facility identification and location data
    • Device information
    • Process information
    • Control equipment specifications
    • Stack parameters for dispersion modeling

How is CEIDARS structured

The following documents provide information on the structure of CEIDARS: 

Accessing CEIDARS data

Emissions data from CEIDARS is available through the Facility Search Tool. 

For specific data needs that aren't available through our public tools, interested parties can submit a Public Records Act (PRA) request to access CEIDARS data. For more information on accessing emissions data or submitting a PRA request, please visit our Guidelines for Accessing Public Records page.