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During the last decade the air quality monitoring stations of the Lombardy region have largely increased in number; the reliability of data transmitted from the 11 provinces was an important point. To tackle the question of data quality, an agreement was signed in 1990 between the regional authorities and the Environment Institute of the European Commission's Joint Research Centre in Ispra, and later pursued up to 2000. Along ten years the Ispra Research Centre has periodically validated 750 analyser operating in fixed monitoring stations by putting into operation a mobile unit equipped with calibrated monitors close to the fixed stations. A data comparison has been made for conventional parameters, such as SO(2), NO/NOx, NO(2), CO, O(3), particulate matter as Total Suspended Particulate and recently PM 10. The results of the validation from 1990 to 2000 are statistically reviewed and discussed. The first practical result has been the validation of the tested monitors, with suggested a revision of some sampling and calibration procedures. In-field conditions are more severe than laboratory conditions and the Region has set up some initiatives of quality assurance to ameliorate the data quality. Along these years the data quality has been high for CO, O(3) data has largely ameliorated while SO(2) data have lost importance due to its decreasing levels. For what concerning TSP (now changed to PM 10) a debate is open. The statistical comparison of the parallel measurements has given information on the reliability of data available for decision-makers as for further elaboration (e.g. modelling).

Additional information

Authors: CERUTTI C, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);SANDRONI S, Istituto di Fisica Generale Applicata, Universitá degli Studi di Milano (IT);BALASSO A, Regione Lombardia, Direzione Generale Tutela Ambientale, Milano (IT);ZABOT S, Regione Lombardia, Direzione Generale Tutela Ambientale, Milano (IT)
Bibliographic Reference: An article published in: Inquinamento, Anno XLIV, numero 37, Aprile 2002, pp.50-57
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