ANNEX III

97/101/EC: Council Decision of 27 January 1997 establishing a reciprocal exchange of information and data from networks and individual stations measuring ambient air pollution within the Member States · European Union

DATA VALIDATION PROCEDURE AND QUALITY CODES 1. Validation procedure The validation procedure should: take into consideration, for example, disturbances due to maintenance, calibration or technical problems, off-scale measurements and data indicating rapid variations, such as excessive falls or rises, The data should also be revised on the basis of criteria based on a knowledge of climatic and meteorological influences specific to the site during the measurement period, and enable the detection of erroneous measurements by techniques such as comparison with preceding months and with other pollutants and standard deviation analysis. The validation list drawn up during the marking of data should also be examined and verified. 2. Quality codes All transmitted data are deemed to be valid, except when associated with code T or N as defined below: Code T: corresponds to data not (or not yet) subjected to the validation procedure as specified in point 1. Code N: corresponds to data characterized as erroneous or doubtful, during the validation procedure as specified in point 1.

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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.