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The problem of data quality in air pollution monitoring networks is reported and the corresponding operations for quality control and quality assurance are described. Of the parameters influencing the quality of the measurements, the distinction is made between parameters acting on sampling and those acting on calibration and analysis. The traceability management principles of the calibration standards in national networks are mentioned. Three quality assurance techniques, already tested for the intercomparison of European networks in the framework of the implementation of EC air quality directives, are presented. In the first technique, static reference mixtures at low concentration of pollutant(s) contained in pressurised cylinders are distributed or circulated to the participant laboratories. The second technique describes an intercalibration bench test with a dynamic atmosphere, giving as example a comparison of various calibration procedures. Finally, quality tests at network stations using a mobile laboratory are shown to be particularly adapted to evaluating the influence of calibrations and samplings on routine measurements.

Additional information

Authors: PAYRISSAT M, JRC Ispra (IT);DE SAEGER E, JRC Ispra (IT);RAU H, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Corso di Aggiornamento "Il controllo della qualità dell'aria", Roma (IT), October 4-6, 1993
Availability: Available from (1) as Paper IT 37971 ORA
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