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The data is now available from the Atmosphere Data Store (ADS), either interactively through its download web form or programmatically using the CDS API service:

CAMS global atmospheric composition forecasts

For details about the migration to the CDS API please have see here.

A subset of the CAMS Global atmospheric composition forecast data for the latest three days can be accessible also through the FTP dissemination service. For list of variables available on the FTP please see here.

Analysis data are not available on the ADS webform but they can be downloaded using the CDS API service. The keyword 'type' and 'leadtime_hour' have to be set on 'analysis' and '0' respectably. Please have a look at the following example:

import cdsapi

c = cdsapi.Client()

c.retrieve(
    'cams-global-atmospheric-composition-forecasts',
    {
        'date': '2021-03-24',
        'time': [
            '06:00', '12:00', '18:00',
        ],
        'leadtime_hour': '0',
        'area': [
            70, -18, 69,
            -17,
        ],
        'type':'analysis',
        'variable': 'total_aerosol_optical_depth_670nm',
        'format': 'netcdf_zip',
    },
    'download.netcdf_zip')

The data remains also listed for now in ECMWF's public data catalogue. To access the data use the ECMWF Web API with ‘dataset’:'cams_nrealtime'. Please have a a look at the following link for Python CAMS real-time examples. 

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