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vlamet Nov 29, 2011 04:54 PM

i have a question about the AirBase database measurements.
At what time system the observations in the database are - local time
for each country or GMT?
Replies (2)
EEA Dec 01, 2011 03:49 PM
Dear vlamet,
Unfortunately we do not have a straight answer to your question.

At the national level the data suppliers can choose to report in their local time zone or universal time, the tag "<network_time_reference_basis>" available within each country's XML files (available within http://www.eea.europa.eu/[…]/airbase-the-european-air-quality-database-3) should provide this information but leads to uncertainties since in some (rare) cases one station can be assigned to two distinct networks having a different time reference basis.

From EEA’s different data providers: There is no harmonization of time references, which means that data are kept in the time zone specified by the National authority.

Regarding EEA’s near real-time air quality work (e.g. EEA’s Ozone web) the various European data providers apply UTC (Coordinated Universal Time).

In terms of validated historical air quality data published in AirBase v5 various approaches are used by data providers according to 97/101/EC: Council Decision of 27 January 1997 establishing a reciprocal exchange of information and data from networks and individual stations measuring ambient air pollution within the Member States:

Many regards
vlamet Dec 01, 2011 10:21 PM
Thank you very much for that answer. Indeed, i didn't know that the information is in xml files.