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Ferrario70 Jul 11, 2019 09:23 AM
I can't understand the difference between this 2 maps:
MAP 1 -
MAP 2 -[…]/up-to-date-air-quality-data
In MAP2 you have NOT data of PM10, how you can calculate, for the same time and date the AQI in MAP1 ???
Please let me understand the difference.
Best regards, Max Ferrario
Replies (1)
EEA Jul 18, 2019 03:42 PM
Dear M. 'Ferrario70',

Thank you for contacting the European Environment Agency (EEA).

The UTD air quality viewer ([…]/up-to-date-air-quality-data) shows the hourly data as the EEA receives them from Member States and one can select between six air pollutants. No index is calculated or shown in this viewer and the EEA does not show worst or best values. This viewer does include PM10 values but it is correct that some PM10 values could be missing since certain countries do not measure PM10 as hourly concentrations, e.g. IT and DK.

The Air Quality Index map ( is based on the same data as the UTD viewer, but here the EEA uses a methodology to define an overall Air Quality Index. You can find the full explanation in the ‘About European Air Quality Index’ section of the index.

Both UTD Air Quality viewer and the Air Quality Index viewer are based on the same data, which the EEA receives on hourly basis from Member States. However, the data cannot be directly compared because in the index, the EEA does gap-filling from the Copernicus Atmosphere Monitoring Service (CAMS - and uses a 24-hour-running mean for both PM10 and PM2.5.

We hope that this information may be useful for you.

With kind regards,
EEA Enquiry Service