CARB Pollution Mapping Tool

Sources in Your Community


Last updated December 28, 2017


CARB has released an updated version of the Pollution Mapping Tool that includes emissions data for toxic air pollutants along with previously available criteria pollutants and greenhouse gases (GHG) from large facilities in California. Users can select facilities by a number of attributes such as name, location, or industrial sector; view their reported emissions using maps, charts and tabular formats; and download data for later use.

Launch the CARB Pollution Mapping Tool

What's New

Major changes in version 2.0 include:

  • At-a-glance facility air toxic emission summaries for eight representative substances;
  • Enhanced “compare” charts that include toxic, criteria and GHG emissions;
  • Comprehensive tables of 2008-2015 toxic emissions data for individual and all-facilities (click here to download);
  • Enhanced filter for Cap-and-Trade covered facilities;
  • New filter for industrial facilities that are subject to AB 617 BACT/BARCT/TBACT requirements; and
  • Updated facility information and emissions data with corrections provided by the air districts.
Welcome to the CARB Pollution Mapping Tool

Caveats about Using Data in the Tool for Comparative Analyses

The criteria, toxic and GHG pollutant emissions data presented in the tool are collected through different emissions reporting programs, each designed to meet specific goals. Therefore, users of the Pollution Mapping Tool must be aware of the differences in reporting requirements and other limitations of the available data.

Read more...

Things to know about Oil and Gas Facilities

In most cases, facilities reporting GHG and criteria pollutant emissions have a one-to-one relationship between the two programs (i.e., a facility that reports GHGs under MRR corresponds exactly to the same facility that reports criteria pollutants into CARB's CEIDARS database). However, this is not the case for onshore oil and natural gas production (oil and gas) facilities, because the definition of what constitutes a facility differs between the two programs.

In CEIDARS, an oil and gas facility is defined as a discrete, contiguous operation often described by a lease name or a collection of Township/Range/Sections that can be tracked down to the square mile. On the other hand, under MRR, an onshore oil and gas facility is defined as all of a company's aggregated operations within a geologic basin, which may encompass multiple counties and operations. Because of this difference, most onshore oil and gas production facilities do not have a one-to-one relationship between CEIDARS and MRR data. CARB has developed a preliminary crosswalk to identify and associate CEIDARS oil and gas facilities to their respective MRR facilities.

Read more...

Differences between GHG and Criteria Pollutant Reporting Programs

Criteria Pollutants Toxic Pollutants GHG Emissions
Reporting Requirements Emissions data are collected under various State and federal mandates that include the California Health and Safety Code, the California Clean Air Act of 1988, the Federal Clean Air Act Amendments of 1990, and the AERR Emissions data are collected under the Air Toxics “Hot Spots” Act (AB2588, 1987, Connelly) Emissions data are collected under CARB's Regulation for the Mandatory Reporting of Greenhouse Gases (MRR)
Reporting Mechanism Emissions data are reported to CARB by the local air districts. In some cases, these emission estimates may be based on methodologies prescribed by the district and may differ from the emissions estimated by the facility. In addition, estimation methods may vary from district to district Emissions data are reported to CARB by the local air districts. In some cases, these emission estimates may be based on methodologies prescribed by the district and may differ from the emissions estimated by the facility. In addition, estimation methods may vary from district to district Facilities report their GHG emissions to CARB using CARB-designated quantification methods
Reporting Thresholds and Frequency AERR requires facilities emitting 250 tons per year to report emissions annually and smaller facilities to report triennially; however, CARB guidelines set a much lower annual threshold (10 tons per year); furthermore, local air districts have the flexibility to set their own reporting thresholds Only facilities meeting specific criteria are required to report. In general, inventories are required every four years, but air districts may require more frequent updates. Facilities that do not pose significant risk to public health may be exempted from update requirements. Facilities emitting 10,000 metric tons or more of CO2equivalent emissions must report annually; facilities emitting 25,000 metric tons or more of CO2equivalent must have their emissions reviewed by an CARB-accredited verifier.
Storage Database Criteria pollutant emissions data are stored in the California Emissions Inventory Development and Reporting System (CEIDARS), which serves as the main repository for emissions data used to develop air quality management plans to show attainment and maintenance of ambient air quality standards Toxic pollutant emissions data are stored in the California Emissions Inventory Development and Reporting System (CEIDARS). Facility ID numbers are different from MRR database Data are stored in CARB’s Mandatory Reporting Regulation (MRR) database. Facility ID numbers are different from CEIDARS database IDs
Oil and Gas Production Facilities Oil and Gas Production emissions are reported at the sub-facility level, which can be a point-source facility or a collection of smaller sources within a contiguous oil or natural gas lease. In order to present GHG and criteria pollutant emissions that can be appropriately compared, the sub-facility criteria pollutant emissions were aggregated to match the MRR facility definitions Oil & Gas Production emissions are reported at the sub-facility level, which can be a point-source facility or a collection of smaller sources within a contiguous oil or natural gas lease. In many cases, the individual sub-facilities may be exempt from the local air district’s toxic pollutant reporting requirements Emissions for Oil and Gas facilities are reported as an aggregate of a company's operations in a geologic basin that typically consists of a very large area covering one or more counties

For more Information, contact pollution_map@arb.ca.gov

preload