- Latest available (Revised)
- Original (As adopted by EU)
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
You are here:
What Version
Opening Options
More Resources
Revised version PDFs
- Revised 18/09/20150.64 MB
Legislation originating from the EU
When the UK left the EU, legislation.gov.uk published EU legislation that had been published by the EU up to IP completion day (31 December 2020 11.00 p.m.). On legislation.gov.uk, these items of legislation are kept up-to-date with any amendments made by the UK since then.
This item of legislation originated from the EU
Legislation.gov.uk publishes the UK version. EUR-Lex publishes the EU version. The EU Exit Web Archive holds a snapshot of EUR-Lex’s version from IP completion day (31 December 2020 11.00 p.m.).
Status:
This is the original version (as it was originally adopted).
A.Definitions and criteria
1.Definitions
AOT40 (expressed in (µg/m3) · hours) means the sum of the difference between hourly concentrations greater than 80 µg/m3 (= 40 parts per billion) and 80 µg/m3 over a given period using only the one-hour values measured between 8.00 and 20.00 Central European Time (CET) each day.
2.Criteria
The following criteria shall be used for checking validity when aggregating data and calculating statistical parameters:
| a In cases where all possible measured data are not available, the following factor shall be used to calculate AOT40 values:
(*) being the number of hours within the time period of AOT40 definition, (i.e. 08:00 to 20:00 CET from 1 May to 31 July each year, for vegetation protection and from 1 April to 30 September each year for forest protection). | ||||
| Parameter | Required proportion of valid data | |||
|---|---|---|---|---|
| One hour values | 75 % (i.e. 45 minutes) | |||
| Eight hours values | 75 % of values (i.e. six hours) | |||
| Maximum daily 8 hours mean from hourly running 8 hours | 75 % of the hourly running eight hours averages (i.e. 18 eight-hourly averages per day) | |||
| AOT40 | 90 % of the one hour values over the time period defined for calculating the AOT40 valuea | |||
| Annual mean | 75 % of the one hour values over summer (April to September) and 75 % over winter (January to March, October to December) seasons separately | |||
| Number of exceedances and maximum values per month | 90 % of the daily maximum eight hours mean values (27 available daily values per month) 90 % of the one hour values between 8.00 and 20.00 CET | |||
| Number of exceedances and maximum values per year | five out of six months over the summer season (April to September) | |||
Options/Help
Print Options
PrintThe Whole Directive
PrintThe Whole Annex
PrintThis Division only
Legislation is available in different versions:
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.
Original (As adopted by EU): The original version of the legislation as it stood when it was first adopted in the EU. No changes have been applied to the text.
Opening Options
Different options to open legislation in order to view more content on screen at once
More Resources
Access essential accompanying documents and information for this legislation item from this tab. Dependent on the legislation item being viewed this may include:
- the original print PDF of the as adopted version that was used for the EU Official Journal
- lists of changes made by and/or affecting this legislation item
- all formats of all associated documents
- correction slips
- links to related legislation and further information resources
More Resources
Use this menu to access essential accompanying documents and information for this legislation item. Dependent on the legislation item being viewed this may include:
- the original print PDF of the as adopted version that was used for the print copy
- correction slips
Click 'View More' or select 'More Resources' tab for additional information including:
- lists of changes made by and/or affecting this legislation item
- confers power and blanket amendment details
- all formats of all associated documents
- links to related legislation and further information resources
All content is available under the Open Government Licence v3.0 except where otherwise stated. This site additionally contains content derived from EUR-Lex, reused under the terms of the Commission Decision 2011/833/EU on the reuse of documents from the EU institutions. For more information see the EUR-Lex public statement on re-use.