10.2190/BK2M-F8VD-1NHW-DDHP BK2MF8VD1NHWDDHP 7 Relationships Between Sulphur Dioxide Pollution and Meteorological Factors in Montreal 165 181 20020509 20020509 20020509 20020509 BK2MF8VD1NHWDDHP.pdf http://baywood.metapress.com/link.asp?target=contribution&id=BK2MF8VD1NHWDDHP 2 R. Cleroux R. Roy A. Robert University of Montreal In this paper the effects of some meteorological variables on the SO2 pollution level is determined for the Montreal region. We have considered the SO2 concentrations measured at six sampling stations in the region of Montreal during the year 1975 together with some meteorological variables measured at one site for the same year. A descriptive analysis of these data indicates which of the available meteorological variables are most related to the SO2 level: wind speed, wind direction and temperature, mainly in winter. Some winds have a cleaning effect whereas others favor pollution. Increasing temperature results in a decreasing SO2 level in the urban area. Then some regression models are built for each station and a more detailed analysis is made of the meteorological variables effects on the SO2 level. These effects can be evaluated locally at each station. Finally a principal component analysis of the stations is made in order to evaluate the same effects globally in the region of Montreal. Environement Canada, <i>Surveillance nationale de la pollution atmosphérique</i> Service de la protection de l'environnement, Rapport EPS-5-AP-74-13, 1974. Environnement Canada, <i>A Nation Wide Inventory of Air Pollutant Emission, Summary of Emissions 1972</i>, Pollution Data Analysis Division, Report EPS-3-AP-75-5, 1975. Services de protection de l'environnement, Gouvernement du Québec, <i>Qualité de l'air, Région ouest</i>, L'éditeur officiel du Québec, 1976. R. Cléroux, R. Roy and N. Fortin, Air Pollution in Montreal: A Statistical Analysis of Sulphur Dioxide Data, <i>Water, Air and Soil Poll, 13</i>, pp. 143-156, 1980. P. Zanetti, P. Melli and E. Runca, Meteorological Factors Affecting Pollution Levels in Venice, <i>Atmospheric Environment, 11</i>, pp. 605-616, 1977. N. R. Draper and H. Smith, <i>Applied Regression Analysis</i>, Wiley, 1966. K. J. Marsh and M. D. Foster, An Experimental Study of the Dispersion of the Emissions from Chimneys in Reading I: The Study of Long-Term Average Concentrations of Sulphur Dioxide, <i>Atmospheric Environment, 1</i>, pp. 527-550, 1967. H. Scheffé, <i>The Analysis of Variance</i>, Wiley, 1959. T. W. Anderson, <i>An Introduction to Multivariate Statistical Analysis</i>, Wiley, 1958. D. B. Turner, Relationships Between 24-Hour Mean Air Quality Measurements and Meteorological Factors in Nashville, Tennessee, <i>J. Air. Poll. Cont. Assoc., 11</i>, pp. 438-489, 1961.