Author(s)

H. Ribeiro & J.V. de Assuncao

Abstract

Sao Paulo, Brazil, a metropolitan region with 39 municipalities and a continuous urban sprawl of 1,051 square kilometers and 16.5 million inhabitants, is responsible for 18% of the country's GNP and six million jobs. Over 40,000 industries and 5.7 million vehicles are registered there (25% of Brazilian car fleet). Three million cars circulate daily and 1 million drive in every day (350,000 trucks). The average car speed is around 17 km/h. These facts cause prohibition of circulation of 20% of passenger cars daily. During the 1970's air quality had an important influence from industrial sources. Nowadays emissions come mainly from vehicles (97.7% of CO; 96.2% of NOx; 97.8% of HC; 69.3% of SOx and 49.3% of particles). Light-duty vehicle

Keywords