Chwilio Deddfwriaeth

Directive 2008/50/EC of the European Parliament and of the CouncilDangos y teitl llawn

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

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ANNEX VIIU.K.OZONE TARGET VALUES AND LONG-TERM OBJECTIVES

A.Definitions and criteriaU.K.

1.DefinitionsU.K.

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.CriteriaU.K.

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:

AOT40estimate = AOT40measured ×total possible number of hours (*)
number of measured hourly 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).
ParameterRequired proportion of valid data
One hour values75 % (i.e. 45 minutes)
Eight hours values75 % of values (i.e. six hours)
Maximum daily 8 hours mean from hourly running 8 hours75 % of the hourly running eight hours averages (i.e. 18 eight-hourly averages per day)
AOT4090 % of the one hour values over the time period defined for calculating the AOT40 valuea
Annual mean75 % 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 yearfive out of six months over the summer season (April to September)

B.Target valuesU.K.

a

Compliance with target values will be assessed as of this date. That is, 2010 will be the first year the data for which is used in calculating compliance over the following three or five years, as appropriate.

b

The maximum daily eight-hour mean concentration shall be selected by examining eight-hour running averages, calculated from hourly data and updated each hour. Each eight -hour average so calculated shall be assigned to the day on which it ends. i.e. the first calculation period for any one day will be the period from 17:00 on the previous day to 01:00 on that day; the last calculation period for any one day will be the period from 16:00 to 24:00 on the day.

c

If the three or five year averages cannot be determined on the basis of a full and consecutive set of annual data, the minimum annual data required for checking compliance with the target values will be as follows:

  • for the target value for the protection of human health: valid data for one year,

  • for the target value for the protection of vegetation: valid data for three years.

ObjectiveAveraging periodTarget valueDate by which target value should be meta
Protection of human healthMaximum daily eight-hour meanb120 μg/m3 not to be exceeded on more than 25 days per calendar year averaged over three yearsc1.1.2010
Protection of vegetationMay to July

AOT40 (calculated from 1 h values)

18 000 μg/m3 · h averaged over five yearsc

1.1.2010

C.Long-term objectivesU.K.

ObjectiveAveraging periodLongterm objectiveDate by which the longterm objective should be met
Protection of human healthMaximum daily eight-hour mean within a calendar year120 μg/m3not defined
Protection of vegetationMay to JulyAOT40 (calculated from 1 h values) 6 000 μg/m3 · hnot defined

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