SCHEDULE 12Collation of information and criteria for aggregating data and calculating statistical parameters
PART 2Criteria for aggregating data and calculating statistical parameters
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The following criteria are to be used for checking validity when aggregating data and calculating statistical parameters—
Parameter | Required proportion of valid data |
---|---|
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 (18 8 hours averages per day) |
AOT40(1) | 90% of the 1 hour values over the time period defined for calculating the AOT40 value(2) |
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) |
(1) In this table, “AOT40”has the same meaning as in paragraph 2(d) of Part 4 of Schedule 1. | |
(2) In cases where all possible measured data are not available, the following factor shall be used to calculate AOT40 values: AOT40 (estimate) = AOT40 measured x (total possible number of hours ÷ number of measured hourly values). The reference in this formula to the total possible number of hours is to the 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). |