From today (19 September 2023) access to the CAMS European air quality forecast plots will change.
They will no longer be available from 'regional.atmosphere.copernicus.eu'. Instead, the forecast plots can be found at this new address: https://atmosphere.copernicus.eu/european-air-quality-forecast-plots
The CAMS European air quality forecast data used to produce these plots can be found at the Atmosphere Data Store (ADS): https://ads.atmosphere.copernicus.eu/cdsapp#!/dataset/cams-europe-air-quality-forecasts?tab=overview
More details are available from this article: https://atmosphere.copernicus.eu/new-interface-our-european-air-quality-forecasts
If you have any question, please raise a query by logging onto our secure Support Portal.
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ECMWF Support