# \#cams\_global\_forecast **URL:** https://forum.ecmwf.int/tag/cams-global-forecast/5.md [Latest](https://forum.ecmwf.int/latest.md) · [Categories](https://forum.ecmwf.int/categories.md) · [Tags](https://forum.ecmwf.int/tags.md) --- ## [CAMS global atmospheric composition forecasts very slow](https://forum.ecmwf.int/t/cams-global-atmospheric-composition-forecasts-very-slow/15157)
**Author:** [@Alessandro\_D\_Ausilio1](https://forum.ecmwf.int/u/Alessandro_D_Ausilio1)\ **Replies:** 1\ **Last updated:** [20 July 2026 11:49 UTC](https://forum.ecmwf.int/t/cams-global-atmospheric-composition-forecasts-very-slow/15157 "2026-07-20T11:49:09Z")
I am trying to download the cams global forecast data for the year 2025 using the API and it is very slow. One request took 12 hours (“request-id”: “25730c4d-8afc-4bc7-ac01-e567cf9b2239”) I wonder if this is something e… --- ## [Missing two last runs from CAMS\_GLOBAL\_ADDITIONAL](https://forum.ecmwf.int/t/missing-two-last-runs-from-cams-global-additional/15104)
**Author:** [@Tamar\_Yacobi](https://forum.ecmwf.int/u/Tamar_Yacobi)\ **Replies:** 1\ **Last updated:** [9 July 2026 08:16 UTC](https://forum.ecmwf.int/t/missing-two-last-runs-from-cams-global-additional/15104 "2026-07-09T08:16:01Z")
In the CAMS\_GLOBAL\_ADDITIONAL directory - the last two runs are missing: 2026062412 and 2026062500 (In the CAMS\_GLOBAL directory these two runs are available) Are you aware of this issue? Is there an estimate for when… --- ## [Confirmation: IFS Cycle 50r1 and AIFS v2 - Joint implementation on 12 May 2026](https://forum.ecmwf.int/t/confirmation-ifs-cycle-50r1-and-aifs-v2-joint-implementation-on-12-may-2026/14937)
**Author:** [@Milana\_Vuckovic](https://forum.ecmwf.int/u/Milana_Vuckovic)\ **Replies:** 0\ **Last updated:** [6 May 2026 07:06 UTC](https://forum.ecmwf.int/t/confirmation-ifs-cycle-50r1-and-aifs-v2-joint-implementation-on-12-may-2026/14937 "2026-05-06T07:06:16Z")
We are pleased to confirm the operational implementation of IFS Cycle 50r1, including numerical weather prediction and atmospheric composition (CAMS), as well as AIFS Single v2 and AIFS Ensemble v2 with the 06 UTC run … --- ## [Copernicus Atmosphere Monitoring Service (CAMS) - implementation of cycle 50r1](https://forum.ecmwf.int/t/copernicus-atmosphere-monitoring-service-cams-implementation-of-cycle-50r1/14851)
**Author:** [@Michela](https://forum.ecmwf.int/u/Michela)\ **Replies:** 0\ **Last updated:** [9 April 2026 10:48 UTC](https://forum.ecmwf.int/t/copernicus-atmosphere-monitoring-service-cams-implementation-of-cycle-50r1/14851 "2026-04-09T10:48:34Z")
ECMWF is planning to introduce the new upgrade of the CAMS (Copernicus Atmosphere Monitoring Service) global real-time data assimilation and forecasting system on 12 May 2026. On the day, the first forecast cycle of CAMS… --- ## [Software upgrade for data extraction of a geographical area from selected CAMS global datasets](https://forum.ecmwf.int/t/software-upgrade-for-data-extraction-of-a-geographical-area-from-selected-cams-global-datasets/14605)
**Author:** [@Anabelle](https://forum.ecmwf.int/u/Anabelle)\ **Replies:** 2\ **Last updated:** [25 February 2026 14:14 UTC](https://forum.ecmwf.int/t/software-upgrade-for-data-extraction-of-a-geographical-area-from-selected-cams-global-datasets/14605 "2026-02-25T14:14:19Z")
On 25th of February 2026, as part of regular operational software upgrades, the software handling area extraction for regular lat-lon gridded datasets will be updated to a new version to correct a behaviour that caused a… --- ## [CAMS Global atmospheric composition forecast now available through the ECMWF Product Requirements Catalogue and pre-schedule delivery](https://forum.ecmwf.int/t/cams-global-atmospheric-composition-forecast-now-available-through-the-ecmwf-product-requirements-catalogue-and-pre-schedule-delivery/14654)
**Author:** [@Michela](https://forum.ecmwf.int/u/Michela)\ **Replies:** 0\ **Last updated:** [29 January 2026 16:30 UTC](https://forum.ecmwf.int/t/cams-global-atmospheric-composition-forecast-now-available-through-the-ecmwf-product-requirements-catalogue-and-pre-schedule-delivery/14654 "2026-01-29T16:30:39Z")
On 11 December 2025, the CAMS Global atmospheric composition forecasts were made available through ECMWF Dissemination for a fee. You can now order and configure the CAMS products through the ECMWF Product Requirements … --- ## [CAMS Global atmospheric composition forecast now also available through ECMWF Dissemination](https://forum.ecmwf.int/t/cams-global-atmospheric-composition-forecast-now-also-available-through-ecmwf-dissemination/14323)
**Author:** [@Michela](https://forum.ecmwf.int/u/Michela)\ **Replies:** 0\ **Last updated:** [10 December 2025 11:30 UTC](https://forum.ecmwf.int/t/cams-global-atmospheric-composition-forecast-now-also-available-through-ecmwf-dissemination/14323 "2025-12-10T11:30:39Z")
We are pleased to announce that the CAMS Global atmospheric composition forecast from 11 December 2025 are also available through ECMWF Dissemination for a fee. In this way, you can select the data you need and they wil… --- ## [Using CAMS data from global atmospheric composition forecasts as IC and BC in WRF-Chem. Trouble Converting GRIB to NetCDF](https://forum.ecmwf.int/t/using-cams-data-from-global-atmospheric-composition-forecasts-as-ic-and-bc-in-wrf-chem-trouble-converting-grib-to-netcdf/1135)
**Author:** [@Maria\_Francisca\_Card](https://forum.ecmwf.int/u/Maria_Francisca_Card)\ **Replies:** 3\ **Last updated:** [26 November 2025 15:21 UTC](https://forum.ecmwf.int/t/using-cams-data-from-global-atmospheric-composition-forecasts-as-ic-and-bc-in-wrf-chem-trouble-converting-grib-to-netcdf/1135 "2025-11-26T15:21:40Z")
Dear all, I downloaded CAMS data from global atmospheric composition forecast for a simulation with WRF-Chem following the instructions How to run the WRF-Chem model using CAMS data as initial and boundary conditions (B… --- ## [CAMS global atmospheric composition forecasts vs analysis](https://forum.ecmwf.int/t/cams-global-atmospheric-composition-forecasts-vs-analysis/13968)
**Author:** [@Kristyna\_Kumpanova](https://forum.ecmwf.int/u/Kristyna_Kumpanova)\ **Replies:** 1\ **Last updated:** [7 August 2025 14:24 UTC](https://forum.ecmwf.int/t/cams-global-atmospheric-composition-forecasts-vs-analysis/13968 "2025-08-07T14:24:05Z")
Could you help me understand the difference between data from forecast and data from analysis? Is there any difference between data from analysis and forecast using leading hour 0? Thank you for clarification. --- ## [Canadian and Russian wildfires and long-range smoke transport](https://forum.ecmwf.int/t/canadian-and-russian-wildfires-and-long-range-smoke-transport/13323)
**Author:** [@Michela](https://forum.ecmwf.int/u/Michela)\ **Replies:** 0\ **Last updated:** [4 June 2025 09:00 UTC](https://forum.ecmwf.int/t/canadian-and-russian-wildfires-and-long-range-smoke-transport/13323 "2025-06-04T09:00:45Z")
Wildfires in Canada and Russia are having significant atmospheric impacts ahead of the boreal summer. Satellite observations show smoke crossing the Atlantic Ocean from Canada to Europe and being transported from Russia’… --- ## [Convert mass mixing ratio (MMR) to mass concentration or to volume mixing ratio (VMR)](https://forum.ecmwf.int/t/convert-mass-mixing-ratio-mmr-to-mass-concentration-or-to-volume-mixing-ratio-vmr/1253)
**Author:** [@Michela](https://forum.ecmwf.int/u/Michela)\ **Replies:** 8\ **Last updated:** [5 March 2025 13:00 UTC](https://forum.ecmwf.int/t/convert-mass-mixing-ratio-mmr-to-mass-concentration-or-to-volume-mixing-ratio-vmr/1253 "2025-03-05T13:00:03Z")
How do I convert MMR to VMR? --- ## [Issue with GFAS and CAMS global forecast outputs due to contaminated observations](https://forum.ecmwf.int/t/issue-with-gfas-and-cams-global-forecast-outputs-due-to-contaminated-observations/3995)
**Author:** [@Michela](https://forum.ecmwf.int/u/Michela)\ **Replies:** 1\ **Last updated:** [11 February 2025 14:16 UTC](https://forum.ecmwf.int/t/issue-with-gfas-and-cams-global-forecast-outputs-due-to-contaminated-observations/3995 "2025-02-11T14:16:32Z")
We are aware of an issue with our Global Fire Assimilation System (GFAS) outputs at high latitudes over the eastern Arctic due to some contaminated Fire Radiative Power observations on 9 August 2024 and causing an area o… --- ## [Ms-global-atmospheric-composition-forecasts incomplete download](https://forum.ecmwf.int/t/ms-global-atmospheric-composition-forecasts-incomplete-download/11148)
**Author:** [@Ronald\_Van\_Assche](https://forum.ecmwf.int/u/Ronald_Van_Assche)\ **Replies:** 4\ **Last updated:** [7 February 2025 19:18 UTC](https://forum.ecmwf.int/t/ms-global-atmospheric-composition-forecasts-incomplete-download/11148 "2025-02-07T19:18:41Z")
i downloaded a dataset from “ms-global-atmospheric-composition-forecasts”, here is what the API server indicated to me as a python script following an online request to obtain the classic air pollution data. dataset = “… --- ## [Details on the new optical properties of Dust in CAMS 49r1](https://forum.ecmwf.int/t/details-on-the-new-optical-properties-of-dust-in-cams-49r1/7257)
**Author:** [@Jerome\_Coin](https://forum.ecmwf.int/u/Jerome_Coin)\ **Replies:** 1\ **Last updated:** [7 February 2025 17:55 UTC](https://forum.ecmwf.int/t/details-on-the-new-optical-properties-of-dust-in-cams-49r1/7257 "2025-02-07T17:55:23Z")
Hello, I see in the announcement of CAMS version 49r1 the following statement: “new aerosol optical properties to account for hydrophilic and aspherical dust”. Could you please provide us with the actual values of the… --- ## [New parameters in the CAMS global atmospheric composition forecasts](https://forum.ecmwf.int/t/new-parameters-in-the-cams-global-atmospheric-composition-forecasts/8231)
**Author:** [@Michela](https://forum.ecmwf.int/u/Michela)\ **Replies:** 0\ **Last updated:** [4 December 2024 18:07 UTC](https://forum.ecmwf.int/t/new-parameters-in-the-cams-global-atmospheric-composition-forecasts/8231 "2024-12-04T18:07:05Z")
We are pleased to announce that two new parameters have been added to the CAMS global atmospheric composition forecasts: Total column volcanic sulphur dioxide (tc\_VSO2) Volcanic sulphur dioxide (VSO2) The data can be … --- ## [Error downloading CAMS Global Atmospheric Composition Predictions dataset](https://forum.ecmwf.int/t/error-downloading-cams-global-atmospheric-composition-predictions-dataset/8137)
**Author:** [@Reinaldo\_Ribeiro](https://forum.ecmwf.int/u/Reinaldo_Ribeiro)\ **Replies:** 0\ **Last updated:** [1 December 2024 18:57 UTC](https://forum.ecmwf.int/t/error-downloading-cams-global-atmospheric-composition-predictions-dataset/8137 "2024-12-01T18:57:50Z")
Hello everyone! I hope you are all well! This is the first topic I have opened in this forum, so I apologize if anything is out of the ordinary. I am here to report a problem and check if other users are facing the sam… --- ## [CAMS Model CY49R1 successfully upgraded on 12 November 2024](https://forum.ecmwf.int/t/cams-model-cy49r1-successfully-upgraded-on-12-november-2024/7622)
**Author:** [@Michela](https://forum.ecmwf.int/u/Michela)\ **Replies:** 0\ **Last updated:** [12 November 2024 12:00 UTC](https://forum.ecmwf.int/t/cams-model-cy49r1-successfully-upgraded-on-12-november-2024/7622 "2024-11-12T12:00:01Z")
ECMWF implemented a new upgrade 49R1 of the CAMS (Copernicus Atmosphere Monitoring Service) global real-time data assimilation and forecasting system on 12 November 2024 for the 12UTC cycle. Key elements are: Change i… --- ## [New dataset published in the ADS: CAMS global greenhouse gas forecasts](https://forum.ecmwf.int/t/new-dataset-published-in-the-ads-cams-global-greenhouse-gas-forecasts/7097)
**Author:** [@Anabelle](https://forum.ecmwf.int/u/Anabelle)\ **Replies:** 0\ **Last updated:** [21 October 2024 09:00 UTC](https://forum.ecmwf.int/t/new-dataset-published-in-the-ads-cams-global-greenhouse-gas-forecasts/7097 "2024-10-21T09:00:29Z")
We are pleased to announce that a new dataset has been published today, 21st October 2024, in the Atmosphere Data Store (ADS): CAMS global greenhouse gas forecasts This much awaited dataset consists of global multi-l… --- ## [Issues using the CDS API in Python](https://forum.ecmwf.int/t/issues-using-the-cds-api-in-python/6813)
**Author:** [@Christian\_Ankerstjerne](https://forum.ecmwf.int/u/Christian_Ankerstjerne)\ **Replies:** 2\ **Last updated:** [12 October 2024 12:10 UTC](https://forum.ecmwf.int/t/issues-using-the-cds-api-in-python/6813 "2024-10-12T12:10:51Z")
To whom it may concern. I am currently trying to access the CDS API via python and having issues. I am running the following code: dataset = "cams-global-atmospheric-composition-forecasts" request = { "variable": \[… --- ## [Dust storms in Australia missed in CAMS forecast?](https://forum.ecmwf.int/t/dust-storms-in-australia-missed-in-cams-forecast/1393)
**Author:** [@Daniel\_Robbins](https://forum.ecmwf.int/u/Daniel_Robbins)\ **Replies:** 3\ **Last updated:** [19 July 2024 13:47 UTC](https://forum.ecmwf.int/t/dust-storms-in-australia-missed-in-cams-forecast/1393 "2024-07-19T13:47:38Z")
As part of a project I'm working on, we are hoping to use the CAMS forecast for dust AOD in our model. We want to use the forecast as we'll hopefully run in in NRT, so we use the latest available 00:00 UTC run that cover… --- ## [Is the option of selecting the grid size of CAMS near real time data removed from the new ADS web interface?](https://forum.ecmwf.int/t/is-the-option-of-selecting-the-grid-size-of-cams-near-real-time-data-removed-from-the-new-ads-web-interface/1562)
**Author:** [@Mohamad\_Albadawi](https://forum.ecmwf.int/u/Mohamad_Albadawi)\ **Replies:** 7\ **Last updated:** [25 June 2024 19:00 UTC](https://forum.ecmwf.int/t/is-the-option-of-selecting-the-grid-size-of-cams-near-real-time-data-removed-from-the-new-ads-web-interface/1562 "2024-06-25T19:00:51Z")
We are using the CAMS near real time data for a wildfire application. In the old interface we always had the option to select a finer grid size of the data (0.125°x0.125° was used). In the new interface there is no such … --- ## [Update on the CAMS global atmospheric composition meteorological data](https://forum.ecmwf.int/t/update-on-the-cams-global-atmospheric-composition-meteorological-data/2052)
**Author:** [@Michela](https://forum.ecmwf.int/u/Michela)\ **Replies:** 0\ **Last updated:** [1 March 2024 12:45 UTC](https://forum.ecmwf.int/t/update-on-the-cams-global-atmospheric-composition-meteorological-data/2052 "2024-03-01T12:45:50Z")
We are pleased to announce that the 6 days delay on the CAMS global atmospheric composition meteorological data has been removed and the data are now available in real-time. You can download the data from the Atmosphere… --- ## [PM10 in air quality forecast - different values in global and EU](https://forum.ecmwf.int/t/pm10-in-air-quality-forecast-different-values-in-global-and-eu/1056)
**Author:** [@Filip\_Karpisek](https://forum.ecmwf.int/u/Filip_Karpisek)\ **Replies:** 4\ **Last updated:** [22 November 2023 08:31 UTC](https://forum.ecmwf.int/t/pm10-in-air-quality-forecast-different-values-in-global-and-eu/1056 "2023-11-22T08:31:11Z")
Greetings! When checking PM10 product in both global and EU forecast, I noticed they are quite different in some regions (I noticed north of Africa for example). Let me show you an example: This is what global forecast … --- ## [Copernicus for detect and trace toxic industrial chemicals (TICs) and weapon of mass destruction (WMDs)](https://forum.ecmwf.int/t/copernicus-for-detect-and-trace-toxic-industrial-chemicals-tics-and-weapon-of-mass-destruction-wmds/1122)
**Author:** [@Teresa\_Martinez\_Rech](https://forum.ecmwf.int/u/Teresa_Martinez_Rech)\ **Replies:** 1\ **Last updated:** [20 November 2023 14:17 UTC](https://forum.ecmwf.int/t/copernicus-for-detect-and-trace-toxic-industrial-chemicals-tics-and-weapon-of-mass-destruction-wmds/1122 "2023-11-20T14:17:22Z")
Copernicus for detect and trace toxic industrial chemicals (TICs) and weapon of mass destruction (WMDs) --- ## [CAMS global atmospheric composition forecast and PM10](https://forum.ecmwf.int/t/cams-global-atmospheric-composition-forecast-and-pm10/1557)
**Author:** [@Chloe\_Tarlen](https://forum.ecmwf.int/u/Chloe_Tarlen)\ **Replies:** 0\ **Last updated:** [18 October 2023 17:14 UTC](https://forum.ecmwf.int/t/cams-global-atmospheric-composition-forecast-and-pm10/1557 "2023-10-18T17:14:25Z")
Currently, I'm working on a project where I'm trying to compare PM10 data in Albany, NY to other sources. While trying to the Panoply software, I'm noticing that every time I try to export PM10 and time data (as a netCDF… --- ## [Compute anthropogenic fraction from CAMS speciated AOD](https://forum.ecmwf.int/t/compute-anthropogenic-fraction-from-cams-speciated-aod/1611)
**Author:** [@Harshbardhan\_Kumar](https://forum.ecmwf.int/u/Harshbardhan_Kumar)\ **Replies:** 0\ **Last updated:** [12 October 2023 03:29 UTC](https://forum.ecmwf.int/t/compute-anthropogenic-fraction-from-cams-speciated-aod/1611 "2023-10-12T03:29:41Z")
Hello! I have attached a Python script here for the computation of F\_anthropogenic over the Indian oceanic region (following flow diagram of section 3 in Bellouin et al., 2013 ACP) using CAMS speciated aerosol optical d… --- ## [Introduction of new parameters in CAMS global atmospheric composition forecasts](https://forum.ecmwf.int/t/introduction-of-new-parameters-in-cams-global-atmospheric-composition-forecasts/1070)
**Author:** [@Anabelle](https://forum.ecmwf.int/u/Anabelle)\ **Replies:** 0\ **Last updated:** [2 August 2023 09:14 UTC](https://forum.ecmwf.int/t/introduction-of-new-parameters-in-cams-global-atmospheric-composition-forecasts/1070 "2023-08-02T09:14:21Z")
Last month, we announced that ECMWF introduced a new upgrade (48R1) of the CAMS (Copernicus Atmosphere Monitoring Service) global real-time data assimilation and forecasting system on 27 June 2023. This upgrade introduc… --- ## [CAMS Model CY48R1 successfully upgraded on 27 June 2023](https://forum.ecmwf.int/t/cams-model-cy48r1-successfully-upgraded-on-27-june-2023/1299)
**Author:** [@Anabelle](https://forum.ecmwf.int/u/Anabelle)\ **Replies:** 1\ **Last updated:** [28 June 2023 09:08 UTC](https://forum.ecmwf.int/t/cams-model-cy48r1-successfully-upgraded-on-27-june-2023/1299 "2023-06-28T09:08:36Z")
ECMWF implemented a new upgrade of the CAMS (Copernicus Atmosphere Monitoring Service) global real-time data assimilation and forecasting system on Tuesday 27 June 2023. Key elements are: Addition of full strato… --- ## [Mapping of CAMS aerosol module to WRF-Chem aerosol schemes](https://forum.ecmwf.int/t/mapping-of-cams-aerosol-module-to-wrf-chem-aerosol-schemes/1552)
**Author:** [@Maria\_Francisca\_Card](https://forum.ecmwf.int/u/Maria_Francisca_Card)\ **Replies:** 0\ **Last updated:** [6 June 2023 12:19 UTC](https://forum.ecmwf.int/t/mapping-of-cams-aerosol-module-to-wrf-chem-aerosol-schemes/1552 "2023-06-06T12:19:07Z")
Hello everyone, I'm presently using the CAMS global forecast compostion to update the boundary conditions of gaseous species in WRF-Chem using MOZBC utility, and found it to be very useful. But I also want to update th… --- ## [Volacanoe desgassing emissions](https://forum.ecmwf.int/t/volacanoe-desgassing-emissions/1569)
**Author:** [@Maria\_Velasquez](https://forum.ecmwf.int/u/Maria_Velasquez)\ **Replies:** 0\ **Last updated:** [31 May 2023 20:00 UTC](https://forum.ecmwf.int/t/volacanoe-desgassing-emissions/1569 "2023-05-31T20:00:01Z")
Hi, I am a researcher and constantly use the reanalysis and forecast CAMS products. I am currently comparing total column emissions of the last years from the volcano Nevado del Ruíz (Colombia) with the literature, and s… [Next page](https://forum.ecmwf.int/tag/cams-global-forecast/5.md?match_all_tags=true&page=1&tags%5B%5D=cams_global_forecast)