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The following information on ozone concentrations shall be obtained and collated—
|Type of station||Level||Averaging/accumulation time||Provisional data for each month from April to September||Report for each year|
In this Schedule, “AOT40” has the same meaning as in paragraph (d) of Part I to Schedule 2.
Maximum daily 8-hour mean.
Data submitted in monthly reports are considered provisional and shall be updated where necessary in subsequent submissions.
|Information threshold||Any||180µg/m3||1 hour||—for each day with any exceedance: date, total hours of exceedance, maximum 1 hour ozone and related NO2 values when required—monthly 1 hour maximum ozone||—for each day with any exceedance: date, total hours of exceedance, maximum 1 hour ozone and related NO2 values, when required|
|Alert threshold||Any||240µg/m3||1 hour||—for each day with any exceedance: date, total hours of exceedance, maximum 1 hour ozone and related NO2 values, when required||—for each day with any exceedance: date, total hours of exceedance, maximum 1 hour ozone and related NO2 values, when required|
|Health protection||Any||120µg/m3||8 hours||—for each day with any exceedance: date, 8 hours maximum (b)||—for each day with any exceedance: date, 8 hours maximum (b)|
|Vegetation protection||Suburban, rural, rural background||AOT40 (a) =6,000µg/m3.h||1 hour, accumulated from May to June||Value|
|Forest protection||Suburban, rural, rural background||AOT40 (a) =20,000µg/m3.h||1 hour, accumulated from April to September||Value|
|Materials||Any||40 µg/m3||1 year||Value|
In this Part, percentiles are to be calculated using the method specified in Council Decision 97/101/EC establishing a reciprocal exchange of information and data from networks and individual stations measuring ambient air pollution within Member States(1).
The following criteria are to be used for checking validity when aggregating data and calculating statistical parameters—
|Parameter||Required proportion of valid data|
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 (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(8 hours per day)|
|AOT40||90% of the 1 hour values over the time period defined for calculating the AOT40 value (a)|
|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 No. L035, 5.2.1997, p. 14.
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