--- title: "Asset detail with monthly emission time series" method: GET path: "/api/v1/environment/ct/sources/{source_id}" tags: ["Environment"] --- # Asset detail with monthly emission time series `GET /api/v1/environment/ct/sources/{source_id}` Fetch a single asset-level source by numeric identifier. Returns monthly rows from January 2021 onward when `time_granularity=month`, else annual rows back to 2015. Response includes the totals block over the selected window, the per-row emission / activity / capacity series, reported owners, subsector rank, and a multi-dimensional confidence matrix. Data sourced from Climate TRACE under CC BY 4.0. ## Path parameters - `source_id` integer, required — Numeric source identifier assigned by Climate TRACE (see `id` on /sources rows). ## Query parameters - `start` string — Start of the time series. Accepts year (YYYY) or ISO date (YYYY-MM-DD). - `end` string — End of the time series. Same formats as `start`. - `time_granularity` string — Granularity for the emission rows. Monthly data is available from 2021-01 onward; annual data back to 2015. - `gas` string — Gas identifier from /definitions/gases. ## Response `200` Full source record with totals, emission time series, owners, and confidence matrix. - EnvelopeCtSourceDetailPayload - `data` CtSourceDetailPayload, required — Response payload for `/environment/ct/sources/{source_id}`. - `source` CtSourceDetail, required — Single-source detail response from `/sources/:id`. - `id` integer, nullable — Numeric source identifier. - `name` string, nullable — Display name of the source. - `sector` string, nullable — Top-level sector slug. - `subsector` string, nullable — Subsector slug. - `country` string, nullable — ISO 3166-1 alpha-3 country code. - `adminId` string, nullable — GADM administrative area identifier at the finest reported level. - `cityId` string, nullable — GHS Functional Urban Area identifier when applicable. - `assetType` string, nullable — Physical asset type. - `sourceType` string, nullable — Observation geometry (`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. - `capacity` number, nullable — Nameplate capacity of the asset. - `capacityUnits` string, nullable — Units for the `capacity` value. - `totals` CtTotals — Aggregate totals block attached to /rankings and /sources/emissions responses. On `/rankings/countries`, this block carries `gas`, `emissionsQuantity`, `start`, `end`. On `/sources/emissions`, the block is `{summaries, timeseries}` (no start / end). On `/sources/{id}`, the block carries per-source units (`activityUnits`, `capacityUnits`). Fields across these three shapes are merged here and marked Optional. - `start` string, nullable — ISO 8601 start of the aggregation window (rankings). - `end` string, nullable — ISO 8601 end of the aggregation window (rankings). - `gas` string, nullable — Gas identifier the totals refer to. - `emissionsQuantity` number, nullable — Total emissions over the window in tonnes of the reported gas. - `emissionsFactor` number, nullable — Emissions factor attached to a single-source totals block. - `emissionsFactorUnits` string, nullable — Units for the emissions factor on single-source totals. - `activity` number, nullable — Activity volume attached to a single-source totals block. - `activityUnits` string, nullable — Units for the `activity` value. - `capacity` number, nullable — Nameplate capacity attached to a single-source totals block. - `capacityUnits` string, nullable — Units for the `capacity` value. - `capacityFactor` number, nullable — Capacity factor attached to a single-source totals block. - `summaries` CtTotalsSummary[], nullable — Gas-level summaries across the aggregation window (/sources/emissions). - `gas` string, nullable — Gas identifier the row refers to. - `emissionsQuantity` number, nullable — Total emissions in tonnes of the reported gas. - `percentage` number, nullable — Share of the aggregation total, expressed as a 0-100 percentage. - `timeseries` CtTotalsTimeseriesRow[], nullable — Period-level breakdown (monthly where available, else annual). - `year` integer, nullable — Calendar year of the aggregate row. - `month` integer, nullable — Calendar month (1-12) for monthly rows. - `gas` string, nullable — Gas identifier the aggregate row refers to. - `sector` string, nullable — Sector slug - present on `sectors.timeseries[]` and `subsectors.timeseries[]`. - `subsector` string, nullable — Subsector slug - present on `subsectors.timeseries[]`. - `emissionsQuantity` number, nullable — Aggregate emissions in tonnes of the reported gas. - `emissions` CtEmissionsRow[], nullable — Monthly (2021+) or annual (2015+) emission rows for the source. - `year` integer, nullable — Calendar year the row applies to. - `month` integer, nullable — Calendar month (1-12) for monthly rows. Absent on annual rows. - `gas` string, nullable — Gas identifier the row refers to. - `emissionsQuantity` number, nullable — Emissions total for the period in tonnes of the reported gas. - `emissionsFactor` number, nullable — Period-level emissions factor when published. - `activity` number, nullable — Activity volume observed in the period. - `capacity` number, nullable — Nameplate capacity applicable to the period. - `capacityFactor` number, nullable — Capacity factor for the period when published. - `owners` CtOwner[], nullable — Reported ownership links - may contain duplicates upstream. - `id` string, nullable — Climate TRACE internal owner identifier (prefix `E1...`). - `name` string, nullable — Legal or commercial name of the owning entity. - `share` number, nullable — Reported share of ownership (0 to 1), when published. - `source` string, nullable — Upstream source of the ownership mapping, when published. - `subsectorRanks` CtSubsectorRank[], nullable — Rank of this source within its subsector for one or more periods. - `year` integer, nullable — Calendar year the rank applies to. - `rank` integer, nullable — 1-based rank of the source within its subsector for the year. - `confidence` CtConfidenceEntry[], nullable — Confidence matrix - ratings per quality dimension. - `year` integer, nullable — Calendar year the ratings apply to. - `activity` string, nullable — Confidence in the reported activity value. - `asset_type` string, nullable — Confidence in the reported asset type classification. - `capacity` string, nullable — Confidence in the reported capacity value. - `capacity_factor` string, nullable — Confidence in the reported capacity factor / utilization value. - `ch4_emissions` string, nullable — Confidence in the reported CH4 emissions. - `ch4_emissions_factor` string, nullable — Confidence in the reported CH4 emissions factor. - `co2_emissions` string, nullable — Confidence in the reported CO2 emissions. - `co2_emissions_factor` string, nullable — Confidence in the reported CO2 emissions factor. - `n2o_emissions` string, nullable — Confidence in the reported N2O emissions. - `n2o_emissions_factor` string, nullable — Confidence in the reported N2O emissions factor. - `other_gas_emissions` string, nullable — Confidence in the reported emissions for gases other than CO2 / CH4 / N2O. - `other_gas_emissions_factor` string, nullable — Confidence in the corresponding emissions factor. - `total_co2e_100yrgwp` string, nullable — Confidence in the aggregated CO2e using GWP100. - `total_co2e_20yrgwp` string, nullable — Confidence in the aggregated CO2e using GWP20. - `meta` SugraMeta, required — Metadata on a /api/v1/* response envelope built through `helpers.response.sugra_response`, which is how routes are expected to answer. A route that assembles its own `meta` dict carries only the keys it writes itself, so an optional field below can be absent because this response has nothing to report OR because that route does not build its envelope here - the two are not distinguishable from the outside (API-43). - `endpoint` string, required — Requested endpoint path. - `data_time` string, required — ISO 8601 timestamp the data on this response is stamped with. It is the source's own timestamp whenever the source supplied one this API could read; when it did not, this field falls back to the value of `response_time` and `data_age_days` is omitted, so the PRESENCE of that field is the signal to read - with the one exception named in its own description, a route that substitutes its own current time for a source timestamp it never received. Usually UTC (`Z`), but a source stating its own numeric offset keeps it (2026-04-16T14:30:00+09:00) rather than being converted a second time. For a source that publishes by period this is the period's START (see `period`) and for one that publishes by calendar day it is that day's midnight - in neither case a moment at which anything was observed or released. - `response_time` string, required — ISO 8601 UTC timestamp when this response was produced. - `provider` string, required — API name and version. - `data_age_days` number, nullable — Age of the data in days at the moment this response was produced, i.e. `response_time` minus `data_time`. Present ONLY when the timestamp this response is stamped with is a clock time that could be read as a real instant. It is ABSENT - never 0 - in every other case. Absent when no readable source timestamp was supplied, because `data_time` then repeats `response_time` and a zero age would assert that the data is current precisely where its true age is unknown. Absent when the source names a calendar day, a month, a quarter or a year (see `period`): the instant is then a boundary this API anchored at midnight, and time since a day or a quarter BEGAN is a different quantity from the age of the data - a daily series is out by up to a day, a quarterly one by up to a quarter. A midnight counts as such a boundary whichever zone it is stated in, and whether the source stated it or this API anchored it. The one case this field cannot see is a route that substitutes its own current time for a source timestamp it never received: the substituted value is a real, readable instant and is indistinguishable from one the source stated, so the age reads as roughly 0. The shared cache-and-fetch helper behind most routes stopped doing that (API-43), but the presence of this field is a statement about the timestamp the response carries, not a guarantee about the route that supplied it. Rounded to 0.001 day (86.4 seconds), so 0.0 is a real measured age anywhere within roughly +/-43 seconds and not a stand-in for unknown; a source stamping an instant in the future reports a negative value (-0.001 or less) rather than being clamped. Sources publish on very different cadences, so a non-zero age is normal, not an error. Preserve absence in client code: a generated client that materialises a missing optional number as its numeric default turns 'age unknown' back into 'age zero', which is the exact confusion this field exists to remove. - `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. - `period` string, nullable — Unit of observation, when the source publishes by period rather than by instant. `data_time` carries the period's START instant so it stays machine-readable; this field preserves what that instant used to mean, which the conversion would otherwise erase. Present only for such sources, and only when the source hands the API the label itself - a client that converts the period to its start instant before building the envelope loses the label, though not the age exclusion, which is decided by the instant. Note that `data_age_days` is omitted whenever this is present, because an age measured from a period start is not a freshness figure. - `notes` string, nullable — Data-quality caveat about THIS response - how old the underlying report is, a chokepoint AIS lower-bound, or that a source-reported `data_time` could not be read and the response time is shown instead. Distinct from `attribution`, which is a licensing obligation. Multiple caveats are joined with ' | '. Present only when there is one. ## Other responses - `401` — Missing or invalid `x-api-key` header. JSON body with a stable `code` distinguishing `missing_api_key` (no header sent) from `invalid_api_key` (header sent, key not accepted); any other 401 source carries the generic `unauthorized` with its detail as `reason`. Plus `hint`. `plan` is always null on 401 - an unauthenticated request has no plan; quota exhaustion is 429, not 401. - `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. ## Changes - **2026-09-01** `328d061c12ca` — 3 info - added the optional property `meta/data_age_days` to the response with the `200` status - added the optional property `meta/notes` to the response with the `200` status - added the optional property `meta/period` to the response with the `200` status - **2026-08-08** `4c4530760ba1` — 12 info - added the optional property `code` to the response with the `401` status - added the optional property `code` to the response with the `429` status - added the optional property `code` to the response with the `503` status - added the optional property `hint` to the response with the `401` status - …8 more [Change history](https://skmtc.dev/sugra/apis/sugra-api/changes/api/v1/environment/ct/sources/:source_id/get.md) --- [API](https://skmtc.dev/sugra/apis/sugra-api.md) · [All operations](https://skmtc.dev/sugra/apis/sugra-api/llms.txt) · [OpenAPI document](https://skmtc.dev/sugra/apis/sugra-api/revisions/746e3fcb3e40?raw)