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felixh Jan 25, 2015 10:09 PM
Choosing a measurement technique from AirBase Data:
Dear Sir or Madam,
I have downloaded AirBase Data for Germany. For some stations, there exist different observations, as different measurement techniques have been use. For example, station DEBB045 reports for 27 jan 2004 PM10 daily means 158.5 (technique 500) and 32 (technique 510). How should I decide which measurement has to be used and which one is used for EU evaluations of air pollutions in cities? Thank you very much.
Replies (1)
EEA Jan 27, 2015 04:00 PM
Indeed it can happen that for some stations, we have two data series for the same period. Choosing between the two can be done on several criteria which includes percentage of valid value, measurement technique used and sampling characteristics. At present we consider both data series if they contain more than 75 % of valid values. However as this might introduce biases in some analyses (aggregation at an upper level), we envisage to use the data measurements done with the reference method (i.e. the gravimetric method for PM) in our assessments. Hope this helps. Kind regards.