Author(s)

J.M. Baldasano & E. Valera

Abstract

Preliminary analysis of air quality data from large cities J. M. Baldasano and E. Valera Department of Engineering Projects, Universitat Politecnica de Catalunya (UPC), Barcelona, Spain Abstract In the past few years, the more developed countries have made great efforts to improve air quality through the adoption of clean air plans which have included measures such as: stricter emission and air quality regulations, continuous air quality monitoring in urban and industrial centres and the use of cleaner fuels such as natural gas, among others. At the same time, in developing countries, there is a clearly perceivable phenomenon of migration from the countryside to the city, which has brought as a consequence greater emissions into the atmosphere, mainly produced by the increase in the number of vehicles circulating, with the additional difficulty that in these countries the tendency is to have a stock of older, worse maintained vehicles than in developed countries, where the nu

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