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 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 | |
---|---|---|---|---|---|
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; | 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 | |||||
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(1) | For each day with any exceedance: date, 8 hours maximum(1) |
Vegetation protection | Suburban, rural, rural background | AOT40(2) = 6,000 μg/m3.h | 1 hour, accumulated from May to June | Value | |
Forest protection | Suburban, rural, rural background | AOT40(2) = 20,000μg/m3.h | 1 hour, accumulated from April to September | Value | |
Materials | Any | 40 μg/m3 | 1 year | Value | |
(1) Maximum daily 8-hour mean. | |||||
(2) In this table, “AOT40” has the same meaning as in paragraph 2(d) of Part 4 of Schedule 1. |
2
The Secretary of State shall 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 shall be considered provisional and shall be updated where necessary in subsequent submissions.
PART 2Criteria for aggregating data and calculating statistical parameters
4
5
The following criteria are to be used for checking validity when aggregating data and calculating statistical parameters—
Parameter | Required proportion of valid data |
---|---|
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 (18 8 hours averages per day) |
AOT40(1) | 90% of the 1 hour values over the time period defined for calculating the AOT40 value(2) |
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) |
(1) In this table, “AOT40”has the same meaning as in paragraph 2(d) of Part 4 of Schedule 1. | |
(2) In cases where all possible measured data are not available, the following factor shall be used to calculate AOT40 values: AOT40 (estimate) = AOT40 measured x (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). |