- Latest available (Revised) - English
- Latest available (Revised) - Welsh
- Original (As made) - English
- Original (As made) - Welsh
This is the original version (as it was originally made). This item of legislation is currently only available in its original format.
4. In this Part, percentiles are to be calculated using the method specified in Council Decision 97/101/EC(1) establishing a reciprocal exchange of information and data from networks and individual stations measuring ambient air pollution within member States.
5. The following criteria are to be used for checking validity when aggregating data and calculating statistical parameters—
Parameter | Required proportion of valid data |
---|---|
(1) In cases where all possible measured data are not available, the following factor must be used to calculate AOT40 values: AOT40 (estimate) = AOT40 measured × (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). | |
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 per day) |
AOT40 | 90% of the 1-hour values over the time period defined for calculating the AOT40 value(1) |
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) |
OJ L 35, 05.02.97, p.14.
Latest Available (revised):The latest available updated version of the legislation incorporating changes made by subsequent legislation and applied by our editorial team. Changes we have not yet applied to the text, can be found in the ‘Changes to Legislation’ area. The revised version is currently only available in English.
Original (As Enacted or Made) - English: The original English language version of the legislation as it stood when it was enacted or made. No changes have been applied to the text.
Original (As Enacted or Made) - Welsh:The original Welsh language version of the legislation as it stood when it was enacted or made. No changes have been applied to the text.
Access essential accompanying documents and information for this legislation item from this tab. Dependent on the legislation item being viewed this may include:
Use this menu to access essential accompanying documents and information for this legislation item. Dependent on the legislation item being viewed this may include:
Click 'View More' or select 'More Resources' tab for additional information including: