CEIDARS

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Overview

The California Emissions Inventory Data Analysis and Reporting System (CEIDARS) is the primary database system used by the California Air Resources Board (CARB) to collect, store, and manage criteria pollutant emissions data throughout California. This sophisticated data management system serves as the foundation for the state's air quality planning efforts.

CEIDARS maintains records of air pollutant emissions for various emission sources across California. The system collects, processes, and stores emissions data including the following criteria pollutants:

  • Particulate Matter (PM)
  • Carbon Monoxide (CO)
  • Sulfur Oxides (SOx)
  • Lead (Pb)
  • Nitrogen Oxides (NOx)
    • Ozone precursor
  • Reactive Organic Gases (ROGs)
    • Ozone precursor

While CEIDARS also stores information for California's toxic air contaminant inventory, this page focuses on the criteria pollutant inventory aspects of the system.

How CEIDARS Works

CEIDARS integrates emissions data from multiple sources and organizes it into a structured database that supports various air quality planning needs. The system:

1. Collects data from local air districts, state agencies, and other sources

2. Processes information using standardized methodologies

3. Validates data through quality assurance procedures

4. Stores emissions inventories for current and historical years

5. Provides outputs for multiple purposes:

  • Serves as input to CEPAM for regulatory planning and modeling
  • Populates public-facing tools that publish facility emissions data
  • Supports various data requests from both internal CARB staff and external stakeholders
  • Fulfills reporting requirements for state and federal programs

Key Features

Facility Information

For stationary point sources, CEIDARS maintains the following information:

  • Facility identification and location data
  • Device information
  • Process information
  • Control equipment specifications
  • Stack parameters for dispersion modeling

Temporal and Spatial Distribution

CEIDARS stores information about when and where emissions occur:

  • Temporal profiles: How emissions vary by season, day of week, and hour of day
  • Spatial allocation: How emissions are distributed geographically across the state

Quality Assurance

CEIDARS implements rigorous quality assurance procedures to ensure data accuracy:

  • Automated validation checks
  • Manual review and verification by CEIDARS staff
  • Cross-referencing with other data sources
  • Historical trend analysis
  • Technical review by subject matter experts

How CEIDARS Supports Air Quality Planning

CEIDARS provides critical information for developing effective strategies to improve air quality in California:

  • Base Year Data for CEPAM: Provides the foundational baseline emissions data that CEPAM uses for projections and scenario modeling
  • State Implementation Plans (SIPs): Supplies essential emissions data for demonstrating compliance with federal air quality standards
  • Regulatory Development: Information to support new emission control regulations
  • Progress Tracking: Historical data to evaluate the effectiveness of control measures
  • Health Risk Assessment: Data to evaluate potential health impacts of air pollution

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.