# CAMS - Datasets and Usage **URL:** https://forum.ecmwf.int/c/datasets-and-usage/cams-datasets-and-usage/14.md?page=1 [Latest](https://forum.ecmwf.int/latest.md) · [Categories](https://forum.ecmwf.int/categories.md) · [Tags](https://forum.ecmwf.int/tags.md) **Page:** 2 --- ## [CAMS Europe: Land-sea mask on new domain (72N)?](https://forum.ecmwf.int/t/cams-europe-land-sea-mask-on-new-domain-72n/12657)
**Author:** [@Matt](https://forum.ecmwf.int/u/Matt)\ **Replies:** 0\ **Last updated:** [16 April 2025 09:43 UTC](https://forum.ecmwf.int/t/cams-europe-land-sea-mask-on-new-domain-72n/12657 "2025-04-16T09:43:29Z")
Hello, in the documentation, there is a link to download the land-sea mask, but it’s 25W/30N/45E/70N (old domain), rather than 72N. Is there a land-sea mask for the new domain somewhere? Thanks --- ## [How to identify fields in European air-quality forecast grib files](https://forum.ecmwf.int/t/how-to-identify-fields-in-european-air-quality-forecast-grib-files/1563)
**Author:** [@Luke\_Jones](https://forum.ecmwf.int/u/Luke_Jones)\ **Replies:** 3\ **Last updated:** [9 April 2025 15:13 UTC](https://forum.ecmwf.int/t/how-to-identify-fields-in-european-air-quality-forecast-grib-files/1563 "2025-04-09T15:13:57Z")
The CAMS European air quality forecast can be retrieved from the Atmosphere Data Store (ADS) in either GRIB or NetCDF format. When requesting multiple models and/or variables in GRIB format however, it may not be clear w… --- ## [Europe air quality forecast : Ozone values?](https://forum.ecmwf.int/t/europe-air-quality-forecast-ozone-values/11888)
**Author:** [@Ronald\_Van\_Assche](https://forum.ecmwf.int/u/Ronald_Van_Assche)\ **Replies:** 5\ **Last updated:** [17 March 2025 16:31 UTC](https://forum.ecmwf.int/t/europe-air-quality-forecast-ozone-values/11888 "2025-03-17T16:31:08Z")
I’m having a problem with the European pollution forecast datasets. I’m downloading PM2.5, PM10, ozone, and nitrogen dioxide data in NETCDF format using the Python API. I used the example in a tutorial to realign the da… --- ## [Download time series WRONG!](https://forum.ecmwf.int/t/download-time-series-wrong/8049)
**Author:** [@hongzhao\_bright](https://forum.ecmwf.int/u/hongzhao_bright)\ **Replies:** 3\ **Last updated:** [17 March 2025 11:17 UTC](https://forum.ecmwf.int/t/download-time-series-wrong/8049 "2025-03-17T11:17:19Z")
When I download The CAMS Global Fire Assimilation System Datasets by month, I inputed the whole month like 2023-09-01 to 2023-09-30, and submit message shows the same period,but the .nc file shows a time period of 2023-0… --- ## [EAC4: t2m=0 for newest three months](https://forum.ecmwf.int/t/eac4-t2m-0-for-newest-three-months/1553)
**Author:** [@Anton\_Driesse](https://forum.ecmwf.int/u/Anton_Driesse)\ **Replies:** 2\ **Last updated:** [15 March 2025 15:47 UTC](https://forum.ecmwf.int/t/eac4-t2m-0-for-newest-three-months/1553 "2025-03-15T15:47:08Z")
Hello, The following request for 6 months of data produces 3 months with t2m=0K. All other data looks plausible. What could be wrong?? Curiously yours, Anton Driesse 2023-08-16 10:13:53,272 INFO Welcome to the CDS … --- ## [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? --- ## [CAMS solar radiation time-series: incorrect/incomplete all-sky data?](https://forum.ecmwf.int/t/cams-solar-radiation-time-series-incorrect-incomplete-all-sky-data/7661)
**Author:** [@Tom\_Kent](https://forum.ecmwf.int/u/Tom_Kent)\ **Replies:** 7\ **Last updated:** [24 February 2025 10:27 UTC](https://forum.ecmwf.int/t/cams-solar-radiation-time-series-incorrect-incomplete-all-sky-data/7661 "2025-02-24T10:27:22Z")
Hello. I have noticed some issues with the CAMS radiation time series data (CAMS solar radiation time-series). When querying all-sky data for some European locations, the GHI variable has a strange/incorrect profile for … --- ## [Can i Use EGG4 Dataset in wrfchem](https://forum.ecmwf.int/t/can-i-use-egg4-dataset-in-wrfchem/11257)
**Author:** [@Muhamamd\_Burhan\_Khalid](https://forum.ecmwf.int/u/Muhamamd_Burhan_Khalid)\ **Replies:** 0\ **Last updated:** [10 February 2025 10:45 UTC](https://forum.ecmwf.int/t/can-i-use-egg4-dataset-in-wrfchem/11257 "2025-02-10T10:45:03Z")
Hi i am working with wrfchem and want to use greenhouse gases parameters can i use data form this source (CAMS global greenhouse gas reanalysis (EGG4)) for simulation if yes then how i can change units of chemical param… --- ## [Band change in CAMS NRT](https://forum.ecmwf.int/t/band-change-in-cams-nrt/8173)
**Author:** [@Earth\_Engine](https://forum.ecmwf.int/u/Earth_Engine)\ **Replies:** 8\ **Last updated:** [16 February 2025 19:03 UTC](https://forum.ecmwf.int/t/band-change-in-cams-nrt/8173 "2025-02-16T19:03:06Z")
Hi, Did something recently change in the CAMS NRT file structure? I no longer see the Total\_column\_hydrogen\_peroxide\_surface band that used to be present. Thanks, Simon --- ## [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… --- ## [Composition of pm10 and pm2.5](https://forum.ecmwf.int/t/composition-of-pm10-and-pm2-5/4704)
**Author:** [@Joao\_Vitor\_Cardoso](https://forum.ecmwf.int/u/Joao_Vitor_Cardoso)\ **Replies:** 1\ **Last updated:** [7 February 2025 17:55 UTC](https://forum.ecmwf.int/t/composition-of-pm10-and-pm2-5/4704 "2025-02-07T17:55:17Z")
Hello, I am considering the equations for pm10 and pm2.5 according to: For the CAMS NRT forecasts of January 24, 2017 (model cycle 43r1) and the CAMS Reanalysis (based on model cycle 42r1). However, I would like to k… --- ## [Pollens value in cams-europe-air-quality-forecasts and online charts different](https://forum.ecmwf.int/t/pollens-value-in-cams-europe-air-quality-forecasts-and-online-charts-different/11221)
**Author:** [@Ronald\_Van\_Assche](https://forum.ecmwf.int/u/Ronald_Van_Assche)\ **Replies:** 2\ **Last updated:** [7 February 2025 15:30 UTC](https://forum.ecmwf.int/t/pollens-value-in-cams-europe-air-quality-forecasts-and-online-charts-different/11221 "2025-02-07T15:30:16Z")
I download pollens forecast : ‘cams-europe-air-quality-forecasts’, { ‘variable’: \[ “alder\_pollen”, “grass\_pollen”, “mugwort\_pollen”, “olive\_pollen”, “ragweed\_pollen” \], there are actually alerts about Alder… --- ## [Help Needed with CAMS Global Reanalysis Dataset and Model Levels](https://forum.ecmwf.int/t/help-needed-with-cams-global-reanalysis-dataset-and-model-levels/10943)
**Author:** [@Ame](https://forum.ecmwf.int/u/Ame)\ **Replies:** 2\ **Last updated:** [28 January 2025 15:41 UTC](https://forum.ecmwf.int/t/help-needed-with-cams-global-reanalysis-dataset-and-model-levels/10943 "2025-01-28T15:41:59Z")
Hello everyone, I’m currently studying air quality over the Himalayan region and need to download the CAMS global reanalysis dataset to run a CTM. Given the complex topography of this region, I understand that selectin… --- ## [CAMS GFAS flux to concentration](https://forum.ecmwf.int/t/cams-gfas-flux-to-concentration/11021)
**Author:** [@User\_luiz\_galizia\_at](https://forum.ecmwf.int/u/User_luiz_galizia_at)\ **Replies:** 0\ **Last updated:** [27 January 2025 11:21 UTC](https://forum.ecmwf.int/t/cams-gfas-flux-to-concentration/11021 "2025-01-27T11:21:48Z")
Hi, I am having a hard time to covert the wildfire PM 2.5 flux (kg m-2 s-1) to concentration (μg/m³) from CAMS GFAS dataset. Any way to estimate the concentration based on the flux data? Thanks, --- ## [Difference between model 60 and pressure level 1000 hPa](https://forum.ecmwf.int/t/difference-between-model-60-and-pressure-level-1000-hpa/10930)
**Author:** [@Luis\_Figueiredo](https://forum.ecmwf.int/u/Luis_Figueiredo)\ **Replies:** 0\ **Last updated:** [21 January 2025 10:32 UTC](https://forum.ecmwf.int/t/difference-between-model-60-and-pressure-level-1000-hpa/10930 "2025-01-21T10:32:50Z")
Hey guys, I want to download CAMS global reanalysis (EAC4) and I am trying to decide if I should download the model level 60 or the pressure level 1000 hPa. Since I think it would be better to have a stable geopotential… --- ## [CAMS global atmospheric composition forecasts - Dry deposition of sea salt aerosol](https://forum.ecmwf.int/t/cams-global-atmospheric-composition-forecasts-dry-deposition-of-sea-salt-aerosol/6495)
**Author:** [@Sergiu\_Paereli](https://forum.ecmwf.int/u/Sergiu_Paereli)\ **Replies:** 4\ **Last updated:** [21 January 2025 08:38 UTC](https://forum.ecmwf.int/t/cams-global-atmospheric-composition-forecasts-dry-deposition-of-sea-salt-aerosol/6495 "2025-01-21T08:38:37Z")
Dry deposition of sea salt aerosol (both small, medium and large particle sizes) variables appear to not have trustful data after October 2020. Have there been any updates since then? Is there an alternative dataset cont… --- ## [Are the carbonaceous aerosols anthropogenic and biomass burning? ](https://forum.ecmwf.int/t/are-the-carbonaceous-aerosols-anthropogenic-and-biomass-burning/10907)
**Author:** [@Jamie\_Kelly](https://forum.ecmwf.int/u/Jamie_Kelly)\ **Replies:** 0\ **Last updated:** [20 January 2025 09:27 UTC](https://forum.ecmwf.int/t/are-the-carbonaceous-aerosols-anthropogenic-and-biomass-burning/10907 "2025-01-20T09:27:34Z")
I am trying to determine if the carbonaceous aerosols are a mixture of anthropogenic and biomass. In the reanalysis, there are hydrophobic and hydrophilic organic matter and black carbon. Can you explain the emissions … --- ## [Convert dimensions of "nitrogen\_dioxide" to ug/m³](https://forum.ecmwf.int/t/convert-dimensions-of-nitrogen-dioxide-to-ug-m/10319)
**Author:** [@Luis\_Figueiredo](https://forum.ecmwf.int/u/Luis_Figueiredo)\ **Replies:** 1\ **Last updated:** [18 December 2024 08:41 UTC](https://forum.ecmwf.int/t/convert-dimensions-of-nitrogen-dioxide-to-ug-m/10319 "2024-12-18T08:41:45Z")
Hello guys, I am extracting the variable “nitrogen\_dioxide” from the CAMS global atmospheric composition forecasts dataset. In the documentation of the dataset i see that the dimensions of the variable “nitrogen\_dioxide… --- ## [Unable to ping ads-beta.atmosphere.copernicus.eu](https://forum.ecmwf.int/t/unable-to-ping-ads-beta-atmosphere-copernicus-eu/10149)
**Author:** [@user293](https://forum.ecmwf.int/u/user293)\ **Replies:** 0\ **Last updated:** [9 December 2024 09:23 UTC](https://forum.ecmwf.int/t/unable-to-ping-ads-beta-atmosphere-copernicus-eu/10149 "2024-12-09T09:23:13Z")
Unable to ping ads-beta.atmosphere.copernicus.eu, the display is as follows: Pinging ads-beta.atmosphere.copernicus.eu \[136.156.139.54\] with 32 bytes of data: Request timed out. Request timed out. Request timed out. --- ## [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… --- ## [Pollen and copernicus](https://forum.ecmwf.int/t/pollen-and-copernicus/7791)
**Author:** [@rosamaria\_arnau](https://forum.ecmwf.int/u/rosamaria_arnau)\ **Replies:** 1\ **Last updated:** [20 November 2024 17:05 UTC](https://forum.ecmwf.int/t/pollen-and-copernicus/7791 "2024-11-20T17:05:56Z")
Good afternoon. I don’t know if this question is correct here. I am a web development student and I am creating an application about air quality and pollen. I would like the data to be provided by Copernicus. I have the… --- ## [Tc\_h2o in CAMS cams-global-atmospheric-composition-forecasts doesn't work anymore](https://forum.ecmwf.int/t/tc-h2o-in-cams-cams-global-atmospheric-composition-forecasts-doesnt-work-anymore/7766)
**Author:** [@Monica\_Rossetti1](https://forum.ecmwf.int/u/Monica_Rossetti1)\ **Replies:** 2\ **Last updated:** [19 November 2024 15:08 UTC](https://forum.ecmwf.int/t/tc-h2o-in-cams-cams-global-atmospheric-composition-forecasts-doesnt-work-anymore/7766 "2024-11-19T15:08:39Z")
I systematically retrieve CAMS data that I update daily in my service. However, from yesterday, the tc\_h20 and h2o cannot be downloaded anymore. I get different errors: For h2o Could not retrieve data from CDS with … --- ## [Wildfire fraction of area observed - Values greater than 1](https://forum.ecmwf.int/t/wildfire-fraction-of-area-observed-values-greater-than-1/7753)
**Author:** [@Dave\_Stewart](https://forum.ecmwf.int/u/Dave_Stewart)\ **Replies:** 0\ **Last updated:** [18 November 2024 19:10 UTC](https://forum.ecmwf.int/t/wildfire-fraction-of-area-observed-values-greater-than-1/7753 "2024-11-18T19:10:24Z")
Hello, I am using a GFAS emissions data set for 2021 and noticed that in some instances offire (Wildfire fraction of area observed) values were larger than 1. Am I correct in saying that offire is the fraction of the g… --- ## [CDSAPI - status remains on accepted - cams-global-atmospheric-composition-forecasts](https://forum.ecmwf.int/t/cdsapi-status-remains-on-accepted-cams-global-atmospheric-composition-forecasts/7156)
**Author:** [@Dominique\_De\_Munck\_De\_Mun](https://forum.ecmwf.int/u/Dominique_De_Munck_De_Mun)\ **Replies:** 6\ **Last updated:** [8 November 2024 15:35 UTC](https://forum.ecmwf.int/t/cdsapi-status-remains-on-accepted-cams-global-atmospheric-composition-forecasts/7156 "2024-11-08T15:35:42Z")
We have a script for downloading forecasts which worked for years, also in a reasonable time (less than a few minutes). I now tried to do the upgrade to the new server, but cannot pass the ‘accepted’ state. I now use a… --- ## [Unable to open zip files of the CAMS global inversion-optimised greenhouse gas products](https://forum.ecmwf.int/t/unable-to-open-zip-files-of-the-cams-global-inversion-optimised-greenhouse-gas-products/7474)
**Author:** [@Diego\_JCO](https://forum.ecmwf.int/u/Diego_JCO)\ **Replies:** 8\ **Last updated:** [8 November 2024 10:12 UTC](https://forum.ecmwf.int/t/unable-to-open-zip-files-of-the-cams-global-inversion-optimised-greenhouse-gas-products/7474 "2024-11-08T10:12:31Z")
I have downloaded one month of data using the API as well as the Web Interface in two different accounts. In both cases, I cannot unzip the downloaded zip file. I have tried this in three computers (Windows, MacOS and Li… --- ## [AOD data products @ 10.5 um](https://forum.ecmwf.int/t/aod-data-products-10-5-um/7197)
**Author:** [@Jonas\_Wilzewski](https://forum.ecmwf.int/u/Jonas_Wilzewski)\ **Replies:** 1\ **Last updated:** [28 October 2024 15:42 UTC](https://forum.ecmwf.int/t/aod-data-products-10-5-um/7197 "2024-10-28T15:42:23Z")
Hello, I am looking for global data products of aerosol optical depth in the infrared spectral range, e.g. @10.5 um. Does CAMS have any such data available? Any model data of infrared AOD would be greatly appreciated. I … --- ## [Precipitation lead time](https://forum.ecmwf.int/t/precipitation-lead-time/7090)
**Author:** [@Sunmin\_Park](https://forum.ecmwf.int/u/Sunmin_Park)\ **Replies:** 0\ **Last updated:** [21 October 2024 02:13 UTC](https://forum.ecmwf.int/t/precipitation-lead-time/7090 "2024-10-21T02:13:14Z")
Hello, I use wet deposition and precipitation data with lead time 0. Checked the values (for example) No3 wet deposition with both large scale and convective precipitation have data in the file however total precipitati… --- ## [Not found for url/Client error](https://forum.ecmwf.int/t/not-found-for-url-client-error/6963)
**Author:** [@Igor\_de\_Amorim\_Teixeira](https://forum.ecmwf.int/u/Igor_de_Amorim_Teixeira)\ **Replies:** 2\ **Last updated:** [16 October 2024 13:13 UTC](https://forum.ecmwf.int/t/not-found-for-url-client-error/6963 "2024-10-16T13:13:35Z")
(base) C:\\Users\\igort\>python era5\_download.py C:\\Users\\igort\\anaconda3\\Lib\\site-packages\\cads\_api\_client\\api\_client.py:69: UserWarning: 404 Client Error: Not Found for url: https://cds.climate.copernicus.eu/api/v2/catal… --- ## [Formula for calculating PM from the emissions inventory data](https://forum.ecmwf.int/t/formula-for-calculating-pm-from-the-emissions-inventory-data/6843)
**Author:** [@Riya\_Mahendra](https://forum.ecmwf.int/u/Riya_Mahendra)\ **Replies:** 1\ **Last updated:** [14 October 2024 17:31 UTC](https://forum.ecmwf.int/t/formula-for-calculating-pm-from-the-emissions-inventory-data/6843 "2024-10-14T17:31:13Z")
I am unable to find PM variable in CAMS emission inventory data. What can be the process or the formula to get the PM emissions data? [Previous page](https://forum.ecmwf.int/c/datasets-and-usage/cams-datasets-and-usage/14.md) [Next page](https://forum.ecmwf.int/c/datasets-and-usage/cams-datasets-and-usage/14.md?page=2)