DEVELOPMENT AND APPLICATION OF STATISTICAL-MODELS FOR CO CONCENTRATION AND DURATION EVENTS IN THE MILAN URBAN AREA

Indications for the intervention strategies to be included in the cont ext of air quality remediation plans for the Milan metropolitan area a re obtained by evaluating 5 years of hourly CO concentration data. The work reports on the analysis of standard exceedances and concentratio n-time trends and on the development of empirical statistical models f or describing relationships between annual concentration averages and air quality-related parameters. The models are applied, in combination with simple roll-back equations, for the evaluation of emissions redu ction required for standards attainment. Similar statistical approache s for describing the dependence between the duration of exceedance epi sodes over fixed concentration levels and simple time series parameter s (annual mean concentrations) are also reported. (C) 1998 Elsevier Sc ience B.V. All rights reserved.