Division A Criteria
United Kingdom
Without prejudice to Annex I, the following criteria shall be used for checking validity when aggregating data and calculating statistical parameters:
| 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 %f1 of the one hour values or (if not available) 24-hour values over the year |
Annotations
Footnotes
- f1
-
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.