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wielaender Nov 19, 2019 02:22 PM
Dear EEA, you tell us that the “European Air Quality Index” shows us how clean the air is that we are breathing RIGHT NOW. And that you are displaying up-to-the-minute data for the whole of Europe. That is obviously wrong. Maybe your displayed data are average values – but they are not at all up-to-the- minute values.

One example: For the station “Linz Römerberg” in Austria on 2019-11-19 12:00 UTC+1 you show a PM10 value of 25,6, the real value is 52,11. You show a PM2,5 value of 17,2, the real value is 35,63.

Do you misinform people to a large extent?
Replies (1)
EEA Nov 21, 2019 09:09 AM
Dear M. Wielaender,
Thank you for contacting the European Environment Agency (EEA).
The EEA is committed in providing reliable air quality information to its audience and several tools are used for this purpose.
The Air Quality Index, that you are referring to, is based on 24 hour moving average, which means that, every hour, we calculate the average concentration over the last 24 hours. The averaging times used for calculating the Index are explained under the link "About the European Air Quality Index". The 24 hour averaging time for PM is done because it is directly related to health impact. If you wish to access hourly values, we suggest you to consult the EEA Up-to-date air quality viewer at[…]/. This viewer presents the latest measurements from Europe’s air quality monitoring network on an hourly basis. The raw data behind these viewers can be accessed at
We hope that this clarifies the matter.

With kind regards,
EEA Enquiry Service