Textual Amendments
F1 Substituted by Commission Decision of 17 October 2001 amending the Annexes to Council Decision 97/101/EC establishing a reciprocal exchange of information and data from networks and individual stations measuring ambient air pollution within the Member States (notified under document number C(2001) 3093) (Text with EEA relevance) (2001/752/EC).
If criteria for the aggregation of data and the calculation of statistical parameters have not been laid down in EU directives the following applies:
Aggregation of data
The criteria for the calculaltion of one-hour and 24-hour values from data with a smaller averaging time are
| — for one-hour values: | Minimum data capture 75 %, |
| — for 24-hour values: | At least 13 one-hour values available, not more than six successive one-hour values missing. |
Calculation of statistical parameters
| — for the mean and the median: | minimum data capture 50 %, |
| — for the percentiles 98, 99,9 and the maximum: | minimum data capture 75 %. |
The ratio between the number of valid data for the two seasons of the year considered cannot be greater than 2, the two seasons being winter (from January to March inclusive and from October to December inclusive) and summer (from April to September inclusive).]