This section has no associated Executive Note
15. The Scottish Ministers may apply a minimum time coverage lower than indicated in the table at paragraph 11, but not lower than 14% for fixed measurements and 6% for indicative measurements provided that they are satisfied that it can be demonstrated that the 95% expanded uncertainty for the annual mean, calculated from the data quality objectives in the table at paragraph 11 according to ISO 11222:2002 – “Determination of the uncertainty of the time average of air quality measurements” will be met.