摘要：The road sector is one of the main sources of air emissions in the atmosphere during both construction and operation. The objective of the present paper is a comprehensive evaluation of the impact on air quality during the two main phases of life cycle of roads. In this case study of a motorway project, the emissions of the primary pollutants, CO, NOx, and PMsub10/sub are estimated, and the results showed that (i) CO and NOx pollutants released during both phases are comparable, while the emissions of PMsub10/sub are more significant in the construction phase; (ii) 85% of PMsub10/sub in construction is due to storage, transit on unpaved road, and crushing; (iii) the portals of the tunnel are the sites where there are higher concentrations of pollutants in operation; and (iv) the CO concentrations estimated by the dispersion model are ly influenced by the topography.
