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Directive 2008/50/EC of the European Parliament and of the CouncilShow full title
Directive 2008/50/EC of the European Parliament and of the Council of 21 May 2008 on ambient air quality and cleaner air for Europe
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- Revised 18/09/20150.64 MB
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A.Criteria
Without prejudice to Annex I, the following criteria shall be used for checking validity when aggregating data and calculating statistical parameters:
| a The requirements for the calculation of annual mean do not include losses of data due to the regular calibration or the normal maintenance of the instrumentation. | |
| Parameter | Required proportion of valid data |
|---|---|
| One hour values | 75 % (i.e. 45 minutes) |
| Eight hours values | 75 % of values (i.e. 6 hours) |
| Maximum daily 8-hour mean | 75 % of the hourly running eight hour averages (i.e. 18 eight hour averages per day) |
| 24-hour values | 75 % of the hourly averages (i.e. at least 18 hour values) |
| Annual mean | 90 %a of the one hour values or (if not available) 24-hour values over the year |
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