Search Emission Metrics

This tool returns emission metrics associated with your query. An emission metric is an estimate of a quantity of pollutant emitted within defined geographic, temporal, sectoral, and/or procedural boundaries. Air pollutant inventories, including those found in this Portal, typically feature the following parameters: Place (country or state/province/territory); Year (or range of years); Pollutant (or pollutant family); Source Category (or subcategory); and Estimation Methodology. Note: Fuel (another key parameter) is not included at this time, because it is not well-defined in the available inventories.

The parameters included in each inventory are shown in the Inventory Overview table below.

Select from the parameters below to refine your search. To ensure that your query returns results, refer to the Inventory Overview table to select parameters that are compatible with one another. Note: When selecting a Source Category or Estimation Methodology, we recommend that you click on the “i” icons for more information.

Select the year or years of interest for your search.


Select one or more country, province, state, or territory of interest.


Select one or more pollutant, or pollutant group, of interest.


Select from the list of source categories below if you wish to refine your search by emitting activity or economic sector.


Select from the list below if you wish to further refine your search by estimation methodology.

Search Places

Use the links below to select countries, states, provinces, or territories.

Quick Links

North American Countries

Canada

Canadian Provinces

United States

American States

Mexico

Mexican States

Search Pollutants

A pollutant is a chemical or agent present in the atmosphere that may contribute to climate change or become hazardous to human health.

Quick Links

All pollutants

Black carbon (BC) and related pollutants

Criteria air contaminants (CAC)

Greenhouse gases (GHG)

Short-lived climate pollutants (SLCP)

Select from either the list of source categories or the list of estimation methodologies below to see the associated pollutant(s). Clicking on a pollutant name will redirect you to the inventory(ies) that have associated pollutant data.


Select from the list of source categories below if you wish to refine your search by emitting activity or economic sector.


Select from the list below if you wish to further refine your search by estimation methodology.

Search Source Categories

A source category is a classification of emissions by emitting activity or economic sector.

Quick Links

CRF 2006 Source Categories

Use this search tool to obtain data for a selected source category, by selecting from either the list of guidance documents or the list of pollutants below.


Select one or more pollutant, or pollutant group, of interest.

Search Estimation Methodologies

An estimation methodology is a method and/or algorithm used to estimate the total emissions of one or more pollutants resulting from an emitting activity.

Quick Links

Revised 1996 IPCC Guidelines

2006 IPCC Guidelines

Use this search tool to obtain estimation methodologies for a selected Source Category or Pollutant.


Select from the list of source categories below if you wish to refine your search by emitting activity or economic sector.


Select one or more pollutant, or pollutant group, of interest.

Searching the database

The North American Portal on Climate Pollutants makes air pollutant emissions inventory data available to users in an intuitive, easy-to-navigate format. Searching the database involves using the Search Tools in the left-hand sidebar menu to query the available inventories. For example:

  • You can use the Browse by Inventory search tool to view a list of all the inventories in the database, then click on any inventory name to explore the data via a variety of options (e.g., place, pollutant, source category). Note: throughout this website, textual information taken from inventories and guidance documents is included in the language in which it was originally published.
  • If you prefer to search the available inventories using a refined query, you may wish to use the Emission Metrics (Advanced Search) tool: This tool returns emission metrics associated with your query. An emission metric is an estimate of a quantity of pollutant emitted within defined geographic, temporal, sectoral and/or procedural boundaries, or parameters. Air pollutant inventories, including those found in this Portal, typically feature the following parameters: Place (country or state/province/territory); Year (or range of years); Pollutant (or pollutant family); Source Category (or subcategory); and Estimation MethodologyNoteFuel (another key parameter) is not included at this time, because it is not well-defined in the available inventories.
  • The other search tools in the left-hand sidebar menu serve as additional ways to explore air pollutant emissions inventory data. Clicking on any of these will bring users to a Query page, featuring various sources of information such as “Quick Links” and a drop-down list of associated variables from which to further refine the query. Clicking on the Source Categories search tool will bring users to a query page with Quick Links to information relating to source categories. Alternately, users can select from the associated variables contained in the drop-down list (e.g., if the user wishes to see which source categories are associated with emissions of black carbon, or which source categories are included in a specific inventory).
  • Depending on the options selected, users will either be directed to additional selection options to further refine their search, or to a Search Results page displaying the results of their query. This page also includes tools for further refining, displaying and exporting the search results. Users seeking to access a large dataset may export a CSV spreadsheet of any report, or write their own application programming interface (API) queries to generate unique spreadsheet exports. They may also write queries to export JSON or XML for use in their own applications and reporting programs.

Please read the About page for more information about the North American Portal on Climate Pollutants.