# CAMS - Datasets and Usage **URL:** https://forum.ecmwf.int/c/datasets-and-usage/cams-datasets-and-usage/14.md [Latest](https://forum.ecmwf.int/latest.md) · [Categories](https://forum.ecmwf.int/categories.md) · [Tags](https://forum.ecmwf.int/tags.md) --- ## [About the CAMS - Datasets and Usage category](https://forum.ecmwf.int/t/about-the-cams-datasets-and-usage-category/20)
**Author:** [@Frank\_Lieber](https://forum.ecmwf.int/u/Frank_Lieber)\ **Replies:** 0
For discussions and information about Copernicus Atmosphere Monitoring Service (CAMS) datasets --- ## [ Clarification on flux\_apri\_bio](https://forum.ecmwf.int/t/clarification-on-flux-apri-bio/15452)
**Author:** [@khabat\_ghamari](https://forum.ecmwf.int/u/khabat_ghamari)\ **Replies:** 0\ **Last updated:** [19 October 2026 08:41 UTC](https://forum.ecmwf.int/t/clarification-on-flux-apri-bio/15452 "2026-10-19T08:41:44Z")
Dear CAMS Support Team, I am using CAMS data for monitoring CO₂ emissions, and I would like to clarify the definition of the variable flux\_apri\_bio in the dataset I am working with. Could you please confirm whether flu… --- ## [Differences between SO2 and tcSO2](https://forum.ecmwf.int/t/differences-between-so2-and-tcso2/1350)
**Author:** [@Katarina\_Vargicova](https://forum.ecmwf.int/u/Katarina_Vargicova)\ **Replies:** 5\ **Last updated:** [18 August 2026 10:29 UTC](https://forum.ecmwf.int/t/differences-between-so2-and-tcso2/1350 "2026-08-18T10:29:22Z")
Hello, I am quite new to atmospheric data andI am working with CAMS reanalysis data to do my diploma thesis. I noticed there are two different parameters for SO2 (but the same for CO, NO2, O3..) I would like to know… --- ## [T2m over sea in CAMS reanalysis](https://forum.ecmwf.int/t/t2m-over-sea-in-cams-reanalysis/15230)
**Author:** [@Andreas\_Sterl1](https://forum.ecmwf.int/u/Andreas_Sterl1)\ **Replies:** 2\ **Last updated:** [15 August 2026 15:50 UTC](https://forum.ecmwf.int/t/t2m-over-sea-in-cams-reanalysis/15230 "2026-08-15T15:50:30Z")
Dear All, I am wondering about a strange jump in T2m over oceans at the beginning of 2017. From 2017 onward, T2M from CAMS is nearly equal to T2m from ERA5, but before 2017 they differ by up t several degrees: Over … --- ## [DMS data in CAMS global reanalysis (EAC4)](https://forum.ecmwf.int/t/dms-data-in-cams-global-reanalysis-eac4/15202)
**Author:** [@Valerio\_Ferracci](https://forum.ecmwf.int/u/Valerio_Ferracci)\ **Replies:** 1\ **Last updated:** [13 August 2026 08:26 UTC](https://forum.ecmwf.int/t/dms-data-in-cams-global-reanalysis-eac4/15202 "2026-08-13T08:26:19Z")
Hello, I am trying to download reanalysis data for Dimethyl sulfide from the CAMS global reanalysis (EAC4), but all the data I manage to download appear to have the same low value (1E-25) for DMS across all coordinates. … --- ## [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… --- ## [Question about availability of CAMS EGG4 Version 2 (2003–2023)](https://forum.ecmwf.int/t/question-about-availability-of-cams-egg4-version-2-2003-2023/15140)
**Author:** [@Mitch\_John](https://forum.ecmwf.int/u/Mitch_John)\ **Replies:** 0\ **Last updated:** [8 July 2026 08:19 UTC](https://forum.ecmwf.int/t/question-about-availability-of-cams-egg4-version-2-2003-2023/15140 "2026-07-08T08:19:10Z")
Dear CAMS EGG4 Support Team, I am currently using the CAMS Global Greenhouse Gas Reanalysis (EGG4) dataset for scientific research. According to the CAMS Validation Report (2024, D82.4.2.2) (https://atmosphere.copernic… --- ## [How to Convert CAMS CO₂ Multi-Level Data (Model & Pressure Levels) to Column-Mean CO₂ (XCO₂)?](https://forum.ecmwf.int/t/how-to-convert-cams-co-multi-level-data-model-pressure-levels-to-column-mean-co-xco/14497)
**Author:** [@liu\_liu](https://forum.ecmwf.int/u/liu_liu)\ **Replies:** 3\ **Last updated:** [8 July 2026 08:12 UTC](https://forum.ecmwf.int/t/how-to-convert-cams-co-multi-level-data-model-pressure-levels-to-column-mean-co-xco/14497 "2026-07-08T08:12:17Z")
In the CAMS Global Greenhouse Gas Reanalysis products (e.g., CAMS-EGG4), CO₂ is provided at both model levels and standard pressure levels as layer-resolved mixing ratios. I would like to compute a column-mean dry-air mo… --- ## [Problems with delayed CAMS global atmospheric composition forecasts in ADS](https://forum.ecmwf.int/t/problems-with-delayed-cams-global-atmospheric-composition-forecasts-in-ads/14980)
**Author:** [@Amy\_Stidworthy](https://forum.ecmwf.int/u/Amy_Stidworthy)\ **Replies:** 8\ **Last updated:** [15 June 2026 11:44 UTC](https://forum.ecmwf.int/t/problems-with-delayed-cams-global-atmospheric-composition-forecasts-in-ads/14980 "2026-06-15T11:44:28Z")
It’s currently 14:10 UTC and the CAMS global forecast dataset for today (18th May) is not yet available through the ADS. We expect the forecast to be available by 10:00 UTC each day, as it says on the documentation page,… --- ## [CAMS EAC4 September-December 2025 when available?](https://forum.ecmwf.int/t/cams-eac4-september-december-2025-when-available/15032)
**Author:** [@Eva\_Sandelowsky](https://forum.ecmwf.int/u/Eva_Sandelowsky)\ **Replies:** 0\ **Last updated:** [29 May 2026 09:17 UTC](https://forum.ecmwf.int/t/cams-eac4-september-december-2025-when-available/15032 "2026-05-29T09:17:40Z")
I need a little more data from the CAMS reanalysis for my research, preferably Sept & Oct 2025. When will this be available in the data store? --- ## ["CAMS gridded solar radiation" data for the period 01/04/2025 to 31/03/2026](https://forum.ecmwf.int/t/cams-gridded-solar-radiation-data-for-the-period-01-04-2025-to-31-03-2026/14983)
**Author:** [@Stefan\_Nonneman](https://forum.ecmwf.int/u/Stefan_Nonneman)\ **Replies:** 1\ **Last updated:** [20 May 2026 14:55 UTC](https://forum.ecmwf.int/t/cams-gridded-solar-radiation-data-for-the-period-01-04-2025-to-31-03-2026/14983 "2026-05-20T14:55:10Z")
Would it be possible to obtain “CAMS gridded solar radiation” data for the period 01/04/2025 until 31/03/2026? In the catalogue I see that this data is available until 2024. I don’t need real-time data, but some what mor… --- ## [Aerosol emissions in GFAS](https://forum.ecmwf.int/t/aerosol-emissions-in-gfas/14813)
**Author:** [@Herve\_Petetin](https://forum.ecmwf.int/u/Herve_Petetin)\ **Replies:** 1\ **Last updated:** [22 April 2026 09:31 UTC](https://forum.ecmwf.int/t/aerosol-emissions-in-gfas/14813 "2026-04-22T09:31:53Z")
Hello, I would like to clarify what exactly is behind the different aerosol species available in GFAS wildfire fluxes: bcfire (Wildfire flux of Black Carbon): does it correspond to BC in fine mode (0-2.5 um)? ocfire (… --- ## [CAMS aerosol reanalysis and hindcast discrepancy](https://forum.ecmwf.int/t/cams-aerosol-reanalysis-and-hindcast-discrepancy/14809)
**Author:** [@Eva\_Sandelowsky](https://forum.ecmwf.int/u/Eva_Sandelowsky)\ **Replies:** 0\ **Last updated:** [23 March 2026 10:32 UTC](https://forum.ecmwf.int/t/cams-aerosol-reanalysis-and-hindcast-discrepancy/14809 "2026-03-23T10:32:14Z")
Hello, I have built a dust and organic matter aerosol seasonal climatology (mean+std) database for my research using the CAMS EAC4 daily reanalysis. I want to use aerosol indices as input in a larger-scale forecasting/e… --- ## [Question about release date of the new GFAS emissions inventory on ADS](https://forum.ecmwf.int/t/question-about-release-date-of-the-new-gfas-emissions-inventory-on-ads/14619)
**Author:** [@\_He](https://forum.ecmwf.int/u/_He)\ **Replies:** 0\ **Last updated:** [19 January 2026 09:11 UTC](https://forum.ecmwf.int/t/question-about-release-date-of-the-new-gfas-emissions-inventory-on-ads/14619 "2026-01-19T09:11:47Z")
Dear ECMWF Community, I would like to ask about the release schedule for the next version of the GFAS wildfire emissions dataset. When the updated GFAS emissions inventory will be made available on the ADS? From w… --- ## [UV Index 5 days forecast ?](https://forum.ecmwf.int/t/uv-index-5-days-forecast/14582)
**Author:** [@Luca\_Milanesi](https://forum.ecmwf.int/u/Luca_Milanesi)\ **Replies:** 2\ **Last updated:** [15 January 2026 08:30 UTC](https://forum.ecmwf.int/t/uv-index-5-days-forecast/14582 "2026-01-15T08:30:24Z")
It seems that I amo not able any to get back 5 days forecast for UV Index. Is it normal? wasn’t it possible before? the dataset is CAMS global atmospheric composition forecasts --- ## [Vertical profiles of aerosol extinction coefficient from CAMS](https://forum.ecmwf.int/t/vertical-profiles-of-aerosol-extinction-coefficient-from-cams/14572)
**Author:** [@Patrick\_Chazette](https://forum.ecmwf.int/u/Patrick_Chazette)\ **Replies:** 1\ **Last updated:** [13 January 2026 14:08 UTC](https://forum.ecmwf.int/t/vertical-profiles-of-aerosol-extinction-coefficient-from-cams/14572 "2026-01-13T14:08:27Z")
Hello, Could you please confirm whether it is possible to download the vertical aerosol extinction coefficient profiles directly from the CAMS data? Thank you. --- ## [Preparing of CAMS data to WRF-Chem](https://forum.ecmwf.int/t/preparing-of-cams-data-to-wrf-chem/1232)
**Author:** [@Joana\_Medeiros](https://forum.ecmwf.int/u/Joana_Medeiros)\ **Replies:** 34\ **Last updated:** [1 December 2025 14:40 UTC](https://forum.ecmwf.int/t/preparing-of-cams-data-to-wrf-chem/1232 "2025-12-01T14:40:18Z")
Dear all, I just downloaded CAMS data for the year 2017 for a simulation with WRF-Chem. I was wondering if you have any advice on how to prepare the data to be ingested by WRF-Chem. Hope to have some feedback soon … --- ## [CAMS ship-based sulfate emission file for the year 2018 is corrupted](https://forum.ecmwf.int/t/cams-ship-based-sulfate-emission-file-for-the-year-2018-is-corrupted/14460)
**Author:** [@Goutam\_Choudhury](https://forum.ecmwf.int/u/Goutam_Choudhury)\ **Replies:** 2\ **Last updated:** [27 November 2025 11:54 UTC](https://forum.ecmwf.int/t/cams-ship-based-sulfate-emission-file-for-the-year-2018-is-corrupted/14460 "2025-11-27T11:54:35Z")
There is an issue with the CAMS-GLOB-SHIP\_v3.2\_sulphate\_2018.nc file. I get an HDF error when trying to access its content using python-xarray or cdo or ncdump. --- ## [Download link for CAMS-GLOB-VOLC-CLIM emission inventory](https://forum.ecmwf.int/t/download-link-for-cams-glob-volc-clim-emission-inventory/14350)
**Author:** [@Mriganka\_Biswas](https://forum.ecmwf.int/u/Mriganka_Biswas)\ **Replies:** 4\ **Last updated:** [26 November 2025 15:36 UTC](https://forum.ecmwf.int/t/download-link-for-cams-glob-volc-clim-emission-inventory/14350 "2025-11-26T15:36:23Z")
Dear all, I need to use CAMS-GLOB-VOLC-CLIM emission inventory for my study of SO2 over south-east Asia. I could not find any link for downloading this particular emission inventory. I request you to please provide me t… --- ## [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 irradiation time series single point product vs. gridded big difference](https://forum.ecmwf.int/t/cams-irradiation-time-series-single-point-product-vs-gridded-big-difference/2907)
**Author:** [@Kerstin\_Schulze](https://forum.ecmwf.int/u/Kerstin_Schulze)\ **Replies:** 1\ **Last updated:** [21 November 2025 08:33 UTC](https://forum.ecmwf.int/t/cams-irradiation-time-series-single-point-product-vs-gridded-big-difference/2907 "2025-11-21T08:33:45Z")
I have a problem with the gridded cams irradiation dataset. If I compare the values e.g. for lat=48.25, lon=12.25 (which should be exactly in the gridded dataset) with the single point time series product , I get for the… --- ## [CAMS global inversion-optimised greenhouse gas satellite observations](https://forum.ecmwf.int/t/cams-global-inversion-optimised-greenhouse-gas-satellite-observations/14352)
**Author:** [@Superpower\_Institute](https://forum.ecmwf.int/u/Superpower_Institute)\ **Replies:** 0\ **Last updated:** [6 November 2025 11:08 UTC](https://forum.ecmwf.int/t/cams-global-inversion-optimised-greenhouse-gas-satellite-observations/14352 "2025-11-06T11:08:05Z")
Which satellite(s) are used as the observation source for the CAMS global inversion-optimised greenhouse gas fluxes and concentrations inversion? We’re interested in using this dataset for the initial and boundary condi… --- ## [Status of EAC5?](https://forum.ecmwf.int/t/status-of-eac5/14275)
**Author:** [@Kristoffer\_Kvist](https://forum.ecmwf.int/u/Kristoffer_Kvist)\ **Replies:** 0\ **Last updated:** [23 October 2025 09:59 UTC](https://forum.ecmwf.int/t/status-of-eac5/14275 "2025-10-23T09:59:47Z")
Does anyone know what the status is on EAC5? When is it realistic to hope for spring 2025 data being available? Best, Kristoffer --- ## [How pm2p5 (73.210) and pm10 (74.210) is calculated in Reanalysis Global data nowdays?](https://forum.ecmwf.int/t/how-pm2p5-73-210-and-pm10-74-210-is-calculated-in-reanalysis-global-data-nowdays/14255)
**Author:** [@Juan\_Felipe\_Mendez\_Espino](https://forum.ecmwf.int/u/Juan_Felipe_Mendez_Espino)\ **Replies:** 1\ **Last updated:** [15 October 2025 15:37 UTC](https://forum.ecmwf.int/t/how-pm2p5-73-210-and-pm10-74-210-is-calculated-in-reanalysis-global-data-nowdays/14255 "2025-10-15T15:37:19Z")
How pm2p5 (73.210) and pm10 (74.210) is calculated in Reanalysis Global data nowdays? --- ## [CAMS policy products available for download ?](https://forum.ecmwf.int/t/cams-policy-products-available-for-download/14204)
**Author:** [@Herve\_Petetin](https://forum.ecmwf.int/u/Herve_Petetin)\ **Replies:** 0\ **Last updated:** [23 September 2025 13:45 UTC](https://forum.ecmwf.int/t/cams-policy-products-available-for-download/14204 "2025-09-23T13:45:17Z")
Hello, is there any CAMS policy product amoung those shown in https://policy.atmosphere.copernicus.eu/yearly/ that can be downloaded (both current and past days/years) in order to further analyse the data and not only lo… --- ## [Gridded solar radiation Data Extraction - change temporal resolution & location](https://forum.ecmwf.int/t/gridded-solar-radiation-data-extraction-change-temporal-resolution-location/14062)
**Author:** [@Henry\_Watanabe](https://forum.ecmwf.int/u/Henry_Watanabe)\ **Replies:** 1\ **Last updated:** [19 August 2025 09:42 UTC](https://forum.ecmwf.int/t/gridded-solar-radiation-data-extraction-change-temporal-resolution-location/14062 "2025-08-19T09:42:02Z")
Hi, I’m trying to find any documentation about the API request for the “cams-gridded-solar-radiation”. According to the manual in confluence, the temporal resolution for this is from 15 minutes. However, when downloadin… --- ## [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. --- ## [Possibility to contribute to the CAMS dataset](https://forum.ecmwf.int/t/possibility-to-contribute-to-the-cams-dataset/13332)
**Author:** [@Matteo\_Guerrieri](https://forum.ecmwf.int/u/Matteo_Guerrieri)\ **Replies:** 3\ **Last updated:** [12 June 2025 11:17 UTC](https://forum.ecmwf.int/t/possibility-to-contribute-to-the-cams-dataset/13332 "2025-06-12T11:17:41Z")
Good morning, for a project of our Italian company we will download daily through “CAMS - European air quality forecasts optimised at observation sites” data of pollutants such as NO2 or PM. Since we will install monit… --- ## [CAMS solar radiation time-series webpage not working](https://forum.ecmwf.int/t/cams-solar-radiation-time-series-webpage-not-working/13217)
**Author:** [@Yen-Shuo\_Huang](https://forum.ecmwf.int/u/Yen-Shuo_Huang)\ **Replies:** 4\ **Last updated:** [5 June 2025 08:13 UTC](https://forum.ecmwf.int/t/cams-solar-radiation-time-series-webpage-not-working/13217 "2025-06-05T08:13:59Z")
As title, the webpage keep loading and cannot send any request. [Next page](https://forum.ecmwf.int/c/datasets-and-usage/cams-datasets-and-usage/14.md?page=1)