---
title: "Rank asset-level emission sources by emissions"
method: GET
path: "/api/v1/environment/ct/sources"
tags: ["Environment"]
---

# Rank asset-level emission sources by emissions

`GET /api/v1/environment/ct/sources`

List asset-level emission sources (power plants, refineries, cement kilns, steel mills, shipping vessels, aviation, forestry flux, and more) filtered by year, gas, sector, subsector, admin area, city, country group, continent, or owner entities. Results are ranked by reported emissions. Use `/sources/{source_id}` for a single-asset drill-down with monthly time series. Data sourced from Climate TRACE under CC BY 4.0.

## Query parameters

- `year` integer — Calendar year of the emissions snapshot. Inventory covers 2015 through the current year.
- `gas` string — Gas identifier from /definitions/gases.
- `sectors` string, nullable — Comma-separated sector slugs. Use `all_no_forest` to exclude forestry-and-land-use.
- `subsectors` string, nullable — Comma-separated subsector slugs.
- `gadm_id` string, nullable — GADM administrative area identifier restricting results to that area.
- `city_id` string, nullable — GHS Functional Urban Area identifier (e.g. `ghs-fua_2702`).
- `country_group` string, nullable — Named country group slug (e.g. `g7`, `g20`, `eu`).
- `continent` string, nullable — Continent name restricting the result set.
- `owner_ids` string, nullable — Comma-separated owner identifiers (e.g. `E100000001213`) from /owners to restrict to company-owned sources.
- `limit` integer — Maximum rows per page (1 to 1000).
- `offset` integer — Offset into the ranked result set.

## Response `200`

Ranked asset-level source rows with centroid, activity, capacity, and emissions totals.

- EnvelopeCtSourcesListPayload
  - `data` CtSourcesListPayload, required — Response payload for `/environment/ct/sources`.
    - `sources` CtSourceSummary[], required — Asset-level source rows ranked by emissions for the requested filters.
      - `id` integer, nullable — Numeric source identifier assigned by Climate TRACE.
      - `name` string, nullable — Display name of the source (e.g. `Vindhyachal power station`).
      - `sector` string, nullable — Top-level sector slug (one of 10 values such as `power`, `manufacturing`).
      - `subsector` string, nullable — Subsector slug (one of 70 values such as `electricity-generation`, `cement`).
      - `country` string, nullable — ISO 3166-1 alpha-3 country code where the source is located.
      - `adminId` string, nullable — GADM administrative area identifier at the finest reported level.
      - `cityId` string, nullable — GHS Functional Urban Area identifier when the source sits inside one.
      - `assetType` string, nullable — Physical asset type (e.g. `coal`, `gas`, `oil`, `cement-kiln`, `aluminum-smelter`).
      - `sourceType` string, nullable — Observation geometry of the source (`point-source`, `area-source`, `line-source`).
      - `centroid` CtCentroid — Geographic centroid of a source in EPSG:4326 (WGS84).
        - `longitude` number, nullable — Longitude in decimal degrees (EPSG:4326 / WGS84).
        - `latitude` number, nullable — Latitude in decimal degrees (EPSG:4326 / WGS84).
        - `srid` integer, nullable — Spatial reference identifier. Always 4326 for WGS84 lon/lat.
      - `gas` string, nullable — Gas identifier that the reported `emissionsQuantity` refers to.
      - `emissionsQuantity` number, nullable — Total emissions for the queried year in tonnes of the reported gas.
      - `emissionsFactor` number, nullable — Emissions per unit of activity (tonnes of gas per unit of `activity`).
      - `emissionsFactorUnits` string, nullable — Denominator units for the emissions factor. Value may be `license restricted` for commercial-source subsectors.
      - `activity` number, nullable — Observed activity volume over the year (e.g. MWh generated, tonnes cement, kilometres sailed).
      - `activityUnits` string, nullable — Units for the `activity` value. May be `license restricted` for some oil-and-gas subsectors.
      - `capacity` number, nullable — Nameplate capacity of the asset (e.g. MW for power plants, tonnes-per-year for cement).
      - `capacityUnits` string, nullable — Units for the `capacity` value.
      - `capacityFactor` number, nullable — Capacity factor or utilization ratio, when published by the upstream data lead.
      - `year` integer, nullable — Calendar year the emissions row applies to.
    - `limit` integer, nullable — Echo of the request `limit` parameter.
    - `offset` integer, nullable — Echo of the request `offset` parameter.
  - `meta` SugraMeta, required — Metadata attached to every /api/v1/* response envelope.
    - `endpoint` string, required — Requested endpoint path.
    - `data_time` string, required — ISO 8601 UTC timestamp of the source data, not of the request.
    - `response_time` string, required — ISO 8601 UTC timestamp when this response was produced.
    - `provider` string, required — API name and version.
    - `source` string, nullable — Identifier of the primary upstream source used for this response.
    - `attribution` string, nullable — Human-readable attribution mandated by an upstream source (e.g. a securities regulator or self-regulatory organization). Present only on responses whose source requires the owner and source to be clearly identified. Do not remove or alter it when using the response.
    - `fallback_used` boolean, nullable — True when the primary source failed and a fallback produced the data.
    - `fallback_chain` string[], nullable — Ordered list of sources attempted, in the order they were tried.
    - `cached` boolean, nullable — True when this response was served from the internal cache.
    - `stale` boolean, nullable — True when the cached response was returned after the upstream rate-limited or errored. Clients can use this to detect degraded data.

## Other responses

- `401` — Missing or invalid `x-api-key` header.
- `422` — Validation Error
- `429` — Daily rate limit exceeded. Check `X-RateLimit-Reset` for the next window.
- `503` — Upstream source is temporarily unavailable. Retry after a short delay.

---

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