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The Air Quality Standards (Wales) Regulations 2007

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Regulation 29

SCHEDULE 12Collation of information and criteria for aggregating data and calculating statistical parameters

PART 1Information to be submitted to the Commission

1.  The following information on ozone concentrations must be obtained and collated—

Type of stationLevelAveraging /accumulation timeProvisional data for each month from April to SeptemberReport for each year
(1)

Maximum daily 8-hour mean.

(2)

In this table, “AOT40” has the same meaning as in paragraph 3(d) of Part 4 of Schedule 1.

Information thresholdAny180μg/m31 hourFor each day with any exceedance: date, total hours of, exceedance, maximum 1-hour ozone and related NO2 values when requiredFor 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
Alert thresholdAny240μg/m31 hourFor each day with any exceedance: date, total hours of exceedance, maximum 1-hour ozone and related NO2 values, when requiredFor each day with any exceedance: date, total hours of exceedance, maximum 1-hour ozone and related NO2 values, when required
Health protectionAny120μg/m38 hoursFor each day with any exceedance: date, 8 hours maximum(1)For each day with any exceedance: date, 8 hours maximum(1)
Vegetation protectionSuburban, rural, rural backgroundAOT40(2) = 6,000 μg/m3.h1 hour, accumulated from May to JuneValue
Forest protectionSuburban, rural, rural backgroundAOT40(2) = 20,000 μg/m3.h1 hour, accumulated from April to SeptemberValue
MaterialsAny40 μg/m31 yearValue

2.  The National Assembly must also ensure that the following information is collated—

(a)for ozone, nitrogen dioxide, oxides of nitrogen and the sums of ozone and nitrogen dioxide (added as parts per billion and expressed in μg/m3 ozone) the maximum, 99.9th, 98th and 50th percentiles and annual average and number of valid data from hourly series; and

(b)the maximum, 98th and 50th percentile and annual average from a series of daily 8-hour ozone maxima.

3.  Data compiled in monthly reports will be considered provisional and must be updated where necessary in subsequent submissions.

PART 2Criteria for aggregating data and calculating statistical parameters

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—

ParameterRequired 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 values75% (45 minutes)
8 hour values75% of values (6 hours)
Maximum daily 8 hours mean from hourly running 8 hours averages75% of the hourly running 8-hour averages (18 8 hours per day)
AOT4090% of the 1-hour values over the time period defined for calculating the AOT40 value(1)
Annual mean75% 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 month90% 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 yearFive out of six summer months over the summer season (April to September)
(1)

OJ L 35, 05.02.97, p.14.

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