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import cdsapi

dataset = 'cams-global-atmospheric-composition-forecasts-test'
request ={
    'date':          ['2024-04-01/2024-04-10'],
    'type':          ['forecast'],
    'data_format':        'netcdf_zip',
    'model_level':   ['137'],                    # Lowest model level only
    'variable':      [ 'biogenic_secondary_organic_aerosol_mass_mixing_ratio'], # See other variables at:
    'time':          ['00:00'],                  # https://ads.atmosphere.copernicus.eu/cdsapp#!/dataset/cams-global-atmospheric-composition-forecasts?tab=form
    'leadtime_hour': [h for h in range(0,25,3)],
    'area':          [70, -35, 35, 60]         # [N,W,S,E] Europe area boundaries
},
client = cdsapi.Client()
client.retrieve(dataset, request).download()