+ANNEX VII OZONE TARGET VALUES AND LONG-TERM OBJECTIVES

ANNEX VII OZONE TARGET VALUES AND LONG-TERM OBJECTIVES



ANNEX VII

OZONE TARGET VALUES AND LONG-TERM OBJECTIVES

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:



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 value (1)

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)
(1)   

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).

B.   Target values



Objective

Averaging period

Target value

Date by which target value should be met (1)

Protection of human health

Maximum daily eight-hour mean (2)

120 μg/m3 not to be exceeded on more than 25 days per calendar year averaged over three years (3)

1.1.2010

Protection of vegetation

May to July

AOT40 (calculated from 1 h values)

18 000  μg/m3 · h averaged over five years (3)

1.1.2010
(1)   

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.

(2)   

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.

(3)   

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.

C.   Long-term objectives



Objective

Averaging period

Longterm objective

Date by which the longterm objective should be met

Protection of human health

Maximum daily eight-hour mean within a calendar year

120 μg/m3

not defined

Protection of vegetation

May to July

AOT40 (calculated from 1 h values) 6 000  μg/m3 · h

not defined

1. Panoramica

,

1.1 Riferimenti

1.2 Requisiti identificati

1.3 Standard correlati

2. Requisiti identificati

Requisiti

3. Standard correlati

Standard