ANNEX VI

DATA QUALITY OBJECTIVES AND COMPILATION OF RESULTS OF AIR QUALITY ASSESSMENT Data quality objectives The following data quality objectives, for allowed uncertainty of assessment methods, and of minimum time coverage and of data capture of measurement are provided to guide quality-assurance programmes. >TABLE> The uncertainty (on a 95 % confidence interval) of the assessment methods will be evaluated in accordance with the principles of the ISO Guide to the Expression of Uncertainty in Measurement (1993) or the methodology of ISO 5725:1994 or equivalent. The percentages for uncertainty in the above table are given for individual measurements averaged over the period considered by the limit value, for a 95 % confidence interval. The uncertainty for the fixed measurements should be interpreted as being applicable in the region of the appropriate limit value. Until such time as CEN standards with detailed test protocols are fully adopted, the Commission will issue, before the adoption of this Directive, the guidelines for use developed by CEN. The uncertainty for modelling and objective estimation is defined as the maximum deviation of the measured and calculated concentration levels, over the period considered, by the limit value, without taking into account the timing of the events. The requirements for minimum data capture and time coverage do not include losses of data due to the regular calibration or the normal maintenance of the instrumentation. Results of air quality assessment The following information should be compiled for zones or agglomerations within which sources other than measurement are employed to supplement information from measurement or as the sole means of air quality assessment: a description of assessment activities carried out; the specific methods used, with references to descriptions of the method; the sources of data and information; a description of results, including uncertainties and, in particular, the extent of any area or, if relevant, the length of road within the zone or agglomeration over which concentrations exceed limit value(s) or, as may be, limit value(s) plus applicable margin(s) of tolerance and of any area within which concentrations exceed the upper assessment threshold or the lower assessment threshold; for limit values the object of which is the protection of human health, the population potentially exposed to concentrations in excess of the limit value. Where possible, Member States should compile maps showing concentration distributions within each zone and agglomeration. Standardisation For benzene and carbon monoxide the measurement result must be standardised at a temperature of 293 K and a pressure of 101,3 kPa.

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Source: EUR-Lex (Cellar) · retrieved 2026-10-12 · Text as adopted (Official Journal); later amendments are not incorporated in this text.