Part II Criteria for aggregating data and calculating statistical parameters
The following criteria are to be used for checking validity when aggregating data and calculating statistical parameters:
| Parameter | Required proportion of valid data |
|---|---|
(a) in cases where all possible measured data are not available, the following factor must be used to calculate AOT40 values: *being the number of hours within the time period of AOT40 definition (that is, 8:00 to 20:00 Central European Time from 1 May to 31 July each year, for vegetation protection and from 1 April to 30 September each year for forest protection). | |
| 1 hour values | 75% (45 minutes) |
| 8 hour values | 75% of values (6 hours) |
| Maximum daily 8 hours mean from hourly running 8 hours averages | 75% of the hourly running 8 hour averages (8 hours per day) |
| AOT40 | 90% of the 1 hour values over the time period defined for calculating the AOT40 f2 |
| Annual mean | 75% of the 1 hour values over summer (April to September) and winter (January to March, October to December) seasons separately |
| Number of exceedances and maximum values per month | 90% of the daily maximum 8 hours mean value (27 available daily values per month) 90% of the 1 hour values between 8:00 and 20:00 Central European Time |
| Number of exceedances and maximum values per year | Five out of six summer months over the summer season (April to September) |
Annotations
Footnotes
- f1
-
OJ L 35, 5.2.1997, p.14
- f2
(a)
in cases where all possible measured data are not available, the following factor must be used to calculate AOT40 values:
*being the number of hours within the time period of AOT40 definition (that is, 8:00 to 20:00 Central European Time from 1 May to 31 July each year, for vegetation protection and from 1 April to 30 September each year for forest protection).