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The Air Quality Limit Values (Scotland) Regulations 2003

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2.2  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 shall be used to calculate AOT40 values:

  • *The number of hours within the time period of AOT40 definition (that is, 0800 to 2000 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 (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 month

90% of the daily maximum 8 hours mean value (27 available daily values per month)

90% of the 1 hour values between 0800 and 2000 Central European Time

Number of exceedances and maximum values per yearFive out of six summer months over the summer season (April to September)

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